8200zl
6200yl
5400zl
3500yl
2900
IPv6 Configuration Guide
ProCurve Switches
K.13.01
T.13.01
www.procurve.com
ProCurve
8212zl Switch
6200yl Switch
Series 5400zl Switches
Series 3500yl Switches
Series 2900 Switches
January 2008
K.13.01
T.13.01
IPv6 Configuration Guide
© Copyright 2008 Hewlett-Packard Development Company,
L.P. The information contained herein is subject to change with-
out notice. All Rights Reserved.
Disclaimer
The information contained in this document is subject to
change without notice.
This document contains proprietary information, which is
protected by copyright. No part of this document may be
photocopied, reproduced, or translated into another
language without the prior written consent of Hewlett-
Packard.
HEWLETT-PACKARD COMPANY MAKES NO WARRANTY
OF ANY KIND WITH REGARD TO THIS MATERIAL,
INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
WARRANTIES OF MERCHANTABILITY AND FITNESS
FOR A PARTICULAR PURPOSE. Hewlett-Packard shall not
be liable for errors contained herein or for incidental or
consequential damages in connection with the furnishing,
performance, or use of this material.
Publication Number
5992-3067
January 2008
The only warranties for HP products and services are set
forth in the express warranty statements accompanying
such products and services. Nothing herein should be
construed as constituting an additional warranty. HP shall
not be liable for technical or editorial errors or omissions
contained herein.
Applicable Products
ProCurve Switch 2900-24G
ProCurve Switch 2900-48G
ProCurve Switch 3500yl-24G-PWR
ProCurve Switch 3500yl-48G-PWR
ProCurve Switch 5406zl
ProCurve Switch 5412zl
ProCurve Switch 6200yl-24G
ProCurve Switch 8212zl
(J9049A)
(J9050A)
(J8692A)
(J8693A)
(J8697A)
(J8698A)
(J8992A)
(J8715A)
Hewlett-Packard assumes no responsibility for the use or
reliability of its software on equipment that is not furnished
by Hewlett-Packard.
Warranty
See the Customer Support/Warranty booklet included with
the product.
Trademark Credits
A copy of the specific warranty terms applicable to your
Hewlett-Packard products and replacement parts can be
obtained from your HP Sales and Service Office or
authorized dealer.
Microsoft, Windows, and Microsoft Windows NT are US
registered trademarks of Microsoft Corporation. Java™ is a
US trademark of Sun Microsystems, Inc.
Hewlett-Packard Company
8000 Foothills Boulevard, m/s 5551
Roseville, California 95747-5551
http://www.procurve.com
Product Publications and IPv6 Command Index
About Your Switch Manual Set . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . xi
Printed Publications. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . xi
Electronic Publications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . xi
IPv6 Command Index . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . xiii
Contents . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-1
Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-2
Conventions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-2
Command Syntax Statements . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-2
Command Prompts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-3
Screen Simulations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-3
Configuration and Operation Examples . . . . . . . . . . . . . . . . . . . . . . . . . 1-3
Keys . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-3
Getting Documentation From the Web . . . . . . . . . . . . . . . . . . . . . . . . . 1-6
Online Help . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-6
Menu Interface . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-6
Command Line Interface . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-7
Contents . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-1
Migrating to IPv6 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-3
IPv6 Propagation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-4
Dual-Stack Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-4
Connecting to Devices Supporting IPv6 Over IPv4 Tunneling . . . . . . 2-5
iii
Use Model . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-6
Adding IPv6 Capability . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-6
Supported IPv6 Operation in Release K.13.01 . . . . . . . . . . . . . . . . . . . . 2-6
Management Features . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-7
IPv6 Time Configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-10
Telnet6 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-10
IP Preserve . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-11
Multicast Listener Discovery (MLD) . . . . . . . . . . . . . . . . . . . . . . . 2-11
Configurable IPv6 Security . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-11
SSHv2 on IPv6 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-11
IP Authorized Managers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-12
Ping6 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-13
Traceroute6 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-13
IPv6 Neighbor Discovery (ND) Controls . . . . . . . . . . . . . . . . . . . . . . . 2-14
Event Log . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-14
SNMP . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-15
Loopback Address . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-15
Debug/Syslog Enhancements . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-15
IPv6 Scalability . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-15
Path MTU (PMTU) Discovery . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-16
iv
Contents . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-1
Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-3
IPv6 Address Structure and Format . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-3
Address Format . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-3
Address Notation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-3
Network Prefix . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-4
Interface (Device) Identifier . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-4
IPv6 Addressing Options . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-5
IPv6 Address Sources . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-5
IPv6 Address Sources . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-7
Applications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-7
3-7
Stateful (DHCPv6) Address Configuration . . . . . . . . . . . . . . . . . . . . . . 3-8
Static Address Configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-9
Address Types and Scope . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-10
Address Types . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-10
Address Scope . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-11
Unicast Address Prefixes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-11
Link-Local Unicast Address . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-13
Autoconfiguring Link-Local Unicast Addresses . . . . . . . . . . . . . . . . . 3-13
Extended Unique Identifier (EUI) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-14
Statically Configuring Link-Local Addresses . . . . . . . . . . . . . . . . . . . . 3-15
Global Unicast Address . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-16
Stateless Autoconfiguration of a Global Unicast Address . . . . . . . . . 3-16
Prefixes in Routable IPv6 Addresses . . . . . . . . . . . . . . . . . . . . . . . . . . 3-18
Unique Local Unicast IPv6 Address . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-19
Anycast Addresses . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-20
Multicast Application to IPv6 Addressing . . . . . . . . . . . . . . . . . . . . . . 3-21
v
Overview of the Multicast Operation in IPv6 . . . . . . . . . . . . . . . . . . . . 3-21
IPv6 Multicast Address Format . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-22
Loopback Address . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-24
The Unspecified Address . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-25
IPv6 Address Deprecation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-25
Contents . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-1
Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-3
General Configuration Steps . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-4
Configuring IPv6 Addressing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-5
4-6
Enabling Automatic Configuration of a Global Unicast Address and a
Operating Notes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-8
Enabling DHCPv6 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-9
Operating Notes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-10
Configuring a Static IPv6 Address on a VLAN . . . . . . . . . . . . . . . . . . 4-11
Operating Notes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-14
Statically Configuring An Anycast Address . . . . . . . . . . . . . . . . . . . . . 4-14
4-16
Disabling IPv6 on a VLAN . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-16
Neighbor Discovery (ND) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-17
Duplicate Address Detection (DAD) . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-18
DAD Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-18
Configuring DAD . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-19
vi
Operating Notes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-20
View the Current IPv6 Addressing Configuration . . . . . . . . . . . . . . 4-21
Router Access and Default Router Selection . . . . . . . . . . . . . . . . . . . 4-27
Router Advertisements . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-27
Router Solicitations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-27
Default IPv6 Router . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-28
Router Redirection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-28
View IPv6 Gateway, Route, and Router Neighbors . . . . . . . . . . . . . 4-29
Viewing Gateway and IPv6 Route Information . . . . . . . . . . . . . . . . . . 4-29
Viewing IPv6 Router Information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-30
Address Lifetimes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-32
Preferred Lifetime . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-32
Valid Lifetime . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-32
Contents . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-1
Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-2
Viewing and Clearing the IPv6 Neighbors Cache . . . . . . . . . . . . . . . . 5-2
Viewing the Neighbor Cache . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-3
Clearing the Neighbor Cache . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-5
Telnet6 Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-6
Outbound Telnet6 to Another Device . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-6
Viewing the Current Telnet Activity on a Switch . . . . . . . . . . . . . . . . . 5-7
Enabling or Disabling Inbound Telnet6 Access . . . . . . . . . . . . . . . . . . 5-8
Viewing the Current Inbound Telnet6 Configuration . . . . . . . . . . . . . . 5-8
SNTP and Timep . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-9
Configuring (Enabling or Disabling) the SNTP Mode . . . . . . . . . . . . . 5-9
Configuring an IPv6 Address for an SNTP Server . . . . . . . . . . . . . . . . 5-10
Configuring (Enabling or Disabling) the Timep Mode . . . . . . . . . . . . 5-12
TFTP File Transfers Over IPv6 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-15
TFTP File Transfers over IPv6 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-15
Enabling TFTP for IPv6 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-16
vii
Using TFTP to Copy Files over IPv6 . . . . . . . . . . . . . . . . . . . . . . . 5-17
Using Auto-TFTP for IPv6 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-19
SNMP Management for IPv6 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-20
SNMP Features Supported . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-20
SNMP Configuration Commands Supported . . . . . . . . . . . . . . . . . . . . 5-21
SNMPv1 and V2c . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-21
SNMPv3 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-21
IP Preserve for IPv6 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-23
Contents . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-1
IPv6 Management Security . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-2
Usage Notes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-3
Using a Mask to Configure Authorized Management Stations . . . . . . 6-5
Configuring Single Station Access . . . . . . . . . . . . . . . . . . . . . . . . . . 6-5
Configuring Multiple Station Access . . . . . . . . . . . . . . . . . . . . . . . . 6-6
Displaying an Authorized IP Managers Configuration . . . . . . . . . . . . 6-12
Secure Shell for IPv6 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-15
Configuring SSH for IPv6 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-15
Contents . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-1
Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-2
Introduction to MLD Snooping . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-3
Configuring MLD . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-8
Enabling or Disabling MLD Snooping on a VLAN . . . . . . . . . . . . . . . . . 7-8
Configuring Per-Port MLD Traffic Filters . . . . . . . . . . . . . . . . . . . . . . . 7-9
Configuring the Querier . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-10
viii
Configuring Fast Leave . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-10
Configuring Forced Fast Leave . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-11
Current MLD Status . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-12
Ports Currently Joined . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-17
Statistics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-18
Counters . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-20
Contents . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8-1
Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8-2
ICMP Rate-Limiting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8-2
Ping for IPv6 (Ping6) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8-4
Traceroute for IPv6 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8-6
DNS Resolver for IPv6 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8-9
DNS Configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8-9
Viewing the Current Configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8-11
Operating Notes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8-11
Debug/Syslog for IPv6 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8-12
Debug Command . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8-13
Configuring Debug Destinations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8-15
Logging Command . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8-16
A Terminology
ix
x
Product Publications and IPv6 Command
Index
About Your Switch Manual Set
N o t e
For the latest version of all ProCurve switch documentation, including
Release Notes covering recently added features, please visit the ProCurve
NetworkingWebsiteatwww.procurve.com, clickon Technicalsupport, andthen
click on Product manuals (all).
Printed Publications
The two publications listed below are printed and shipped with your switch.
The latest version of each is also available in PDF format on the ProCurve Web
site, as described in the above Note.
■
Read Me First—Provides software update information, product notes,
and other information.
■
Installation and Getting Started Guide—Explains how to prepare for
and perform the physical installation and connect the switch to your
network.
Electronic Publications
The latest version of each publication listed in this section (including the
above printed publications) is available in PDF format on the ProCurve Web
site, as described in the Note at the top of this page.
The six publications listed below cover all of the switches supported by this
manual.
■
■
■
■
■
■
Management and Configuration Guide—Describes how to configure,
manage, and monitor basic switch operation.
AdvancedTrafficManagementGuide—Explainshow toconfigure traffic
management features such as VLANs, MSTP, QoS, and Meshing.
Multicast and Routing Guide—Explains how to configure IGMP, PIM, IP
routing, and VRRP features.
Access Security Guide—Explains how to configure access security fea-
tures and user authentication on the switch.
IPv6 Configuration Guide—Describes the IPv6 protocol operations that
are supported on the switch.
Release Notes—Describe new features, fixes, and enhancements that
become available between revisions of the main product guide.
ix
The two publications listed below support all of the switches covered by this
manual except the ProCurve Series 2900 switches:
■
Command Line Interface Reference Guide—Provides a comprehensive
description of CLI commands, syntax, and operations.
■
Event Log Message Reference Guide—Provides a comprehensive descrip-
tion of event log messages.
x
Command
Min. Level
Page
Authorized Manager
ipv6 authorized managers < ipv6-addr >*
show ipv6 authorized-managers
Copy
Global Config
Manager
6-5
6-12
auto-tftp
Global Config 5-19
copy tftp < target > < ipv6-addr > < filename >
copy < source > tftp < ipv6-addr > < filename >
tftp6 [ client | server ]
Manager
Manager
5-17
5-18
Global Config 5-16
Debug/Syslog
debug ipv6 < dhcpv6-client | nd >
logging < syslog-ipv4-addr >
Diagnostic
Manager
8-14
Global Config 8-16
ping6
Operator
Operator
8-4
8-7
traceroute6
DNS
ip dns domain-name < domain-name-str >
ip dns server-address priority < 1 - 3 > < ipv6-addr >*
IPv6 Addressing
Global Config 8-10
Global Config
8-9
ipv6 address autoconfig
VLAN Config
VLAN Config
VLAN Config
VLAN Config
VLAN Config
VLAN Config
Operator
4-7
4-9
ipv6 address dhcp full [ rapid-commit ]
ipv6 address fe80::< device-id > link-local
ipv6 address < ipv6-addr >/< prefix-len >
ipv6 address < ipv6-addr >/< prefix-len > eui-64
ipv6 address < ipv6-addr >/< prefix-len > anycast
show ipv6
4-12
4-13
4-13
4-15
4-21
4-23
show ipv6 vlan < vid >
Operator
IPv6 Management
clear ipv6 neighbors
Manager
n/a
5-5
5-23
4-6
ip preserve (Command file entry; not a CLI command.)
ipv6 enable
VLAN Config
Global Config
ipv6 icmp error-interval < 0 - 2147483647 >
8-3
*A link-local address in these commands must include %vlan< vid > as a suffix. For example,
fe80::110:252%vlan20.
xii
Command
Min. Level
Page
IPv6 Management (Continued)
ipv6 nd dad-attempts < 0 - 600 >
show ipv6 neighbors
show ipv6 route
Global Config 4-19
Operator
Operator
Operator
5-3
4-29
4-30
show ipv6 routers
snmp-server host < ipv6-addr >*
MLD
Global Config 5-21
ipv6 mld
VLAN Config
VLAN Config
VLAN Config
VLAN Config
VLAN Config
Operator
7-8
ipv6 mld [< auto | blocked | forward > < port-list >]
ipv6 mld fastleave < port-list >
ipv6 mld forcedfastleave < port-list >
ipv6 mld querier
7-9
7-10
7-11
7-10
7-12
7-15
7-17
7-18
7-20
show ipv6 mld vlan < vid >
config
Operator
group [ ipv6-addr ]*
statistics
Operator
Operator
counters
Operator
SSH
ip ssh filetransfer
ip ssh ip-version < 4 | 6 | 4or6 >
Telnet
Global Config 6-18
Global Config 6-16
show console
Operator
5-8
5-7
5-6
5-8
show telnet
Operator
telnet < ipv6-addr >*
telnet6-server
Manager
Global Config
Timep
ip timep dhcp
Global Config 5-13
Global Config 5-13
ip timep manual < ipv6-addr >*
show sntp
Manager
Manager
5-11
5-14
show timep
sntp server priority < 1 - 3 > < ipv6-addr >*
Global Config 5-10
*A link-local address in these commands must include %vlan< vid > as a suffix. For example,
fe80::110:252%vlan20.
xiii
xiv
1
Getting Started
Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-2
Conventions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-2
Command Syntax Statements . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-2
Command Prompts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-3
Screen Simulations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-3
Configuration and Operation Examples . . . . . . . . . . . . . . . . . . . . . . . . . 1-3
Keys . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-3
Getting Documentation From the Web . . . . . . . . . . . . . . . . . . . . . . . . . 1-6
Online Help . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-6
Menu Interface . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-6
Command Line Interface . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-7
Web Browser Interface . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-7
To Set Up and Install the Switch in Your Network . . . . . . . . . . . . . . . 1-8
1-1
Getting Started
Introduction
Introduction
This guide is intended for use with the following switches:
■
■
■
■
ProCurve Switch 8200zl series
ProCurve Switch 5400zl series
ProCurve Switch 2900 series
It describes how to use the command line interface (CLI) to configure,
manage, monitor, and troubleshoot switch operation. For an overview of
other product documentation for the above switches, refer to “Product Doc-
umentation”onpage ix. Youcandownloaddocumentationfromthe ProCurve
Networking web site, www.procurve.com.
Conventions
This guide uses the following conventions for command syntax and displayed
information.
Command Syntax Statements
Syntax: ip < default-gateway < ip-addr >> | routing >
Syntax: show interfaces [port-list ]
■
■
■
■
Vertical bars ( | ) separate alternative, mutually exclusive elements.
Square brackets ( [ ] ) indicate optional elements.
Braces ( < > ) enclose required elements.
Braces within square brackets ( [ < > ] ) indicate a required element within
an optional choice.
■
■
Boldface indicates use of a CLI command, part of a CLI command syntax,
or other displayed element in general text. For example:
“Use the copy tftp command to download the key from a TFTP server.”
Italics indicate variables for which you must supply a value when execut-
ingthecommand. Forexample, inthiscommandsyntax, youmustprovide
one or more port numbers:
Syntax: telnet < ipv6-address >
1-2
Getting Started
Conventions
Command Prompts
In the default configuration, your switch displays a CLI prompt similar to the
following example:
ProCurve 8212zl#
To simplify recognition, this guide uses ProCurve to represent command
prompts for all switch models. For example:
ProCurve#
(You can use the hostname command to change the text in the CLI prompt.)
Screen Simulations
Displayed Text. Figures containing simulated screen text and command
output look like this:
ProCurve> show version
Image stamp: /sw/code/build/info
January 14, 2008 13:43:13
K.13.01
243
ProCurve>
Figure 1-1. Example of a Figure Showing a Simulated Screen
In some cases, brief command-output sequences appear without figure iden-
tification. For example:
ProCurve(config)# clear public-key
ProCurve(config)# show ip client-public-key
show_client_public_key: cannot stat keyfile
Configuration and Operation Examples
Unless otherwise noted, examples using a particular switch model apply to all
switch models covered by this guide.
Keys
Simulationsofactualkeysuseabold, sans-seriftypefacewithsquarebrackets.
For example, the Tab key appears as [Tab] and the “Y” key appears as [Y].
1-3
Getting Started
Sources for More Information
Sources for More Information
This guide covers features related to IPv6 operation in software release
K.13.01, and includes an IPv6 command index on page xi.
For information about switch operation and features not covered inthis guide,
refer to the switch publications listed in this section.
N o t e
For the latest version of all ProCurve switch documentation referred to below,
including Release Notes covering recently added features, visit the ProCurve
Networkingwebsite atwww.procurve.com, clickon Technicalsupport, andthen
click on Product Manuals (all).
■
Software Release Notes—Release Notes are posted on the ProCurve
Networking web site and provide information on new software updates:
•
•
•
new features and how to configure and use them
software management, including downloading software to the switch
software fixes addressed in current and previous releases
■
■
Product Notes and Software Update Information—The printed Read Me
First shipped with your switch provides software update information,
product notes, and other information.
Installation and Getting Started Guide—Use the Installation and Get-
ting Started Guide shipped with your switch to prepare for and perform
the physical installation. This guide also steps you through connecting the
switch to your network and assigning IP addressing, as well as describing
the LED indications for correct operation and trouble analysis.
■
Management and Configuration Guide—Use this guide for information
on topics such as:
•
•
•
•
•
•
•
•
•
various interfaces available on the switch
memory and configuration operation
interface access
IP addressing
time protocols
port configuration, trunking, traffic control, and PoE operation
Redundant management
SNMP, LLDP, and other network management topics
file transfers, switch monitoring, troubleshooting, and MAC address
management
1-4
Getting Started
Sources for More Information
■
Advanced Traffic Management Guide—Use this guide for information on
topics such as:
•
VLANs: Static port-based and protocol VLANs, and dynamic GVRP
VLANs
•
•
•
•
spanning-Tree: 802.1D (STP), 802.1w (RSTP), and 802.1s (MSTP)
meshing
Quality-of-Service (QoS)
Access Control Lists (ACLs)
■
Multicast and Routing Guide—Use this guide for information on topics
such as:
•
•
•
•
IGMP
PIM (SM and DM)
IP routing
VRRP
■
Access Security Guide—Use this guide for information on topics such as:
•
•
•
•
•
•
•
•
Local username and password security
Web-Based and MAC-based authentication
RADIUS and TACACS+ authentication
SSH (Secure Shell) and SSL (Secure Socket Layer) operation
802.1X access control
Port security operation with MAC-based control
Authorized IP Manager security
Key Management System (KMS)
■
IPv6 Configuration Guide—Use this guide for information on topics
such as:
•
Overview of IPv6 operation and features supported in software
release K.13.01
•
•
Configuring IPv6 addressing
Using IPv6 management, security, and troubleshooting features
■
Feature Index—The following software guides for your switch include an
index of non-IPv6 features (and where to find them). This index immedi-
ately preceeds the first chapter in each guide listed.
•
•
•
•
Management and Configuration Guide
Advanced Traffic Management Guide
Access Security Guide
Multicast and Routing Guide
1-5
Getting Started
Sources for More Information
Getting Documentation From the Web
To obtain the latest versions of documentation and release notes for your
switch:
1. Go to the ProCurve Networking web site at
www.procurve.com
2. Click on Technical support.
3. Click on Product manuals.
4. Click on the product for which you want to view or download a manual.
If you need further information on ProCurve switch technology, visit the
ProCurve Networking web site at:
www.procurve.com
Online Help
Menu Interface
If you need information on specific parameters in the menu interface, refer to
the online help provided in the interface. For example:
Online Help
for Menu
Figure 1-2. Online Help for Menu Interface
1-6
Getting Started
Sources for More Information
Command Line Interface
If you need information on a specific command in the CLI, type the command
name followed by help. For example:
Figure 1-3. Example of CLI Help
Web Browser Interface
If you need information on specific features in the ProCurve Web Browser
Interface, use the online Help. You can access the Help by clicking on the
question mark button in the upper right corner of any of the web browser
interface screens.
The Help Button
Figure 1-4. Button for Web Browser Interface Online Help
N o t e
To access the online Help for the ProCurve web browser interface, you need
either ProCurve Manager (version 1.5 or greater) installed on your network
or an active connection to the World Wide Web. Otherwise, Online help for the
web browser interface will not be available.
1-7
Getting Started
To Set Up and Install the Switch in Your Network
To Set Up and Install the Switch in Your
Network
Use the ProCurve Installation and Getting Started Guide (shipped with the
switch) for the following:
■
Notes, cautions, and warnings related to installing and using the switch
and its related modules
■
■
Instructions for physically installing the switch in your network
Quickly assigning an IP address and subnet mask, set a Manager pass-
word, and (optionally) configure other basic features.
■
Interpreting LED behavior.
For the latest version of the Installation and Getting Started Guide for your
switch, refer to “Getting Documentation From the Web” on page 1-6.
1-8
2
Introduction to IPv6
Migrating to IPv6 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-3
IPv6 Propagation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-4
Dual-Stack Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-4
Connecting to Devices Supporting IPv6 Over IPv4 Tunneling . . . . . . 2-5
Use Model . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-6
Adding IPv6 Capability . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-6
Supported IPv6 Operation in Release K.13.01 . . . . . . . . . . . . . . . . . . . . 2-6
Management Features . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-7
IPv6 Time Configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-10
Telnet6 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-10
IP Preserve . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-11
Multicast Listener Discovery (MLD) . . . . . . . . . . . . . . . . . . . . . . . 2-11
Configurable IPv6 Security . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-11
SSHv2 on IPv6 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-11
IP Authorized Managers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-12
Diagnostic and Troubleshooting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-13
2-1
Introduction to IPv6
Contents
Ping6 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-13
Traceroute6 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-13
IPv6 Neighbor Discovery (ND) Controls . . . . . . . . . . . . . . . . . . . . . . . 2-14
Event Log . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-14
SNMP . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-15
Loopback Address . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-15
Debug/Syslog Enhancements . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-15
IPv6 Scalability . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-15
Path MTU (PMTU) Discovery . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-16
2-2
Introduction to IPv6
Migrating to IPv6
Migrating to IPv6
To successfully migrate to IPv6 involves maintaining compatibility with the
large installed base of IPv4 hosts and routers for the immediate future. To
achievethispurpose,softwarereleaseK.13.01supportsdual-stack(IPv4/IPv6)
operation and connectons to IPv6-aware routers for routing IPv6 traffic
between VLANs and across IPv4 networks.
N o t e
Software release K.13.01 supports traffic connections with IPv6-aware
routers, but does not support IPv6 routing operation in the switches covered
by this guide.
Beginning with software release K.13.01, the switches covered by this guide
support the following IPv6 protocol operations:
■
■
■
receiving IPv6 traffic addressed to the switch
transmitting IPv6 traffic originating on the switch
switching IPv6 traffic between IPv6 devices connected to the switch on
the same VLAN
■
■
concurrent (dual-stack) operation with IPv4 traffic and devices on the
same VLAN
using a connection to an external, IPv6-configured router, forward IPv6
traffic intended for devices on other VLANs and for traffic that must
traverse an IPv4 network to reach an IPv6 destination
IPv6/IPv4
Router
DHCPv6
Server
IPv6/IPv4
Router
ProCurve
SwitchRunning
Release K.13.01
ProCurve
SwitchRunning
Release K.13.01
IPv4 Network
H1
H2
H3
H5
H4
IPv6/IPv4
Router
IPv6-Capable
DNS Server
H6
Figure 2-1. Dual-Stack ProCurve Switches Employed in an IPv4/IPv6 Network
2-3
Introduction to IPv6
Migrating to IPv6
IPv6 Propagation
IPv6 is currently in the early stages of deployment worldwide, involving a
phased-in migration led by the application of basic IPv6 functionality. In these
applications, IPv6 traffic is switched among IPv6-capable devices on a given
LAN, and routed between LANs using IPv6-capable routers. Using the IPv6
features in this software release, the switch can operate in an IPv6 network,
be managed using an IPv6 management station, and interact with DHCPv6 and
IPv6-enabled DNS servers in the same network or accessible through a
connection to an IPv6 router.
Dual-Stack Operation
Since most initial IPv6 deployments are in networks having a mixture of IPv6
and IPv4 hosts software release K.13.01 supports dual- stack IPv4/IPv6 oper-
ation. This enables the switch to communicate individually with IPv4 and IPv6
devices with their respective protocols. Thus, IPv4 and IPv6 traffic is
supported simultaneously on the same VLAN interface. This means that both
IPv4 and IPv6 devices can operate at the same time on a given VLAN.
N o t e
Software release K.13.01 does not include gateways for translation between
IPv6 and IPv4 traffic. While IPv4 and IPv6 traffic coexists on the same VLAN,
the individual IPv4 and IPv6 devices ignore each other's traffic.
ToforwardIPv6trafficfrom theswitchtoanIPv6-capabledeviceonadifferent
VLAN, a link to an external IPv6-capable router is needed. Also, IPv6 traffic
movement from the switch over IPv4 paths requires routers capable of IPv6
over IPv4 tunneling.
2-4
Introduction to IPv6
Migrating to IPv6
Connecting to Devices Supporting IPv6 Over IPv4
Tunneling
The switches covered by this guide can interoperate with IPv6/IPv4 devices
capable oftunneling IPv6 trafficacrossanIPv4infrastructure. Some examples
include:
■
traffic between IPv6/IPv4 routers(router/router)
■
traffic between an IPv6/IPv4 router and an IPv6/IPv4 host capable of
tunneling (router/host)
N o t e
Tunneling requires an IPv6-capable router. A switch running software release
K.13.01 does not route or tunnel IPv6 traffic. To enable IPv6 traffic from the
switch to be routed or to be tunneled across an IPv4 network, it is necessary
to connect the switch to an appropriate IPv6-capable router. For more infor-
mation, refer to the documentation provided with the dual- stack (IPv4/IPv6)
routers you plan to use for this purpose.
IPv6 tunneling eases IPv6 deployment by maintaining compatibility with the
large existing base of IPv4 hosts and routers. Generally, the various IPv6
tunneling methods enable IPv6 hosts and routers to connect with other IPv6
hosts and routers over the existing IPv4 Internet.
Information Sources for Tunneling IPv6 Over IPv4
For more information on IPv6 routing and tunneling, refer to the documenta-
tionprovidedwiththeIPv6/IPv4routing andtunneling-capabledevicesinyour
network. Some other sources of information are:
■
■
■
■
RFC 2893: “Transition Mechanisms for IPv6 Hosts and Routers”
RFC 2401: “Security Architecture for the Internet Protocol”
RFC 2473: “Generic Packet Tunneling in IPv6 Specification”
RFC 2529: “Transmission of IPv6 via IPv4 Domains without Explicit
Tunnels”
■
RFC 3056: “Connection of IPv6 Domains Over IPv4 Clouds”
2-5
Introduction to IPv6
Use Model
Use Model
Adding IPv6 Capability
IPv6 was designed by the Internet Engineering Task Force (IETF) to improve
on the scalability, security, ease of configuration, and network management
capabilities of IPv4.
IPv6 provides increased flexibility and connectivity for existing networked
devices, addresses the limited address availability inherent in IPv4, and the
infrastructure for the next wave of Internet devices, such as PDAs, mobile
phones and appliances.
Where IPv4 networks exist today, IPv6 will be phased in over a period of years,
requiring an interoperability among the devices using the two protocols.
Beginning with software release K.13.01, the switches covered by this guide
offer IPv4/IPv6 dual stack operation. This allows full ethernet link support for
both IPv4 and IPv6 traffic to move on the same interface (VLAN) without
modifying current IPv4 network topologies. This enables you to use IPv6
devices on existing VLANs, manage the switch and other devices from IPv6
management stations, and create "islands" of IPv6 devices as needed to
accomodate the need for the IPv6 network growth anticipated for the future.
Supported IPv6 Operation in Release K.13.01
Software release K.13.01 provides IPv6 protocol and addressing to support
IPv6 routing features are not available in this release. However, using a dual-
stack (IPv4/IPv6-capable) router, IPv6 traffic can be routed between VLANs
and sent across an IPv4 network to another IPv6 device.
(For general information on sending IPv6 traffic across an IPv4 network, refer
to “Connecting to Devices Supporting IPv6 Over IPv4 Tunneling” on page 2-5.)
The IPv6 features available in release K.13.01 belong to these general catego-
ries:
■
■
■
■
switch configuration and management
security
IPv6 multicast traffic
diagnostic and troubleshooting
2-6
Introduction to IPv6
Configuration and Management
ThenextthreesectionsoutlinetheIPv6featuressupportedinsoftwarerelease
K.13.01.
Configuration and Management
This section outlines the configurable management features supporting IPv6
operation on your ProCurve IPv6-ready switch.
Management Features
Software release K.13.01 provides host-based IPv6 features that enable the
switches covered in this guide to be managed from an IPv6 management
station and to operate in both IPv6 and IPv4/IPv6 network environments.
N o t e
Software release K.13.01 does not include IPv6 routing, but interoperates with
routers that support IPv6 and IPv4/IPv6 router applications.
IPv6 Addressing
The switch offers these IPv6 address configuration features:
■
■
■
SLAAC (stateless automatic address configuration)
DHCPv6 (stateful automatic address configuration)
static address configuration
SLAAC (Stateless Automatic Address Configuration)
Enabling IPv6 on a VLAN automatically enables configuration of a link-local
unicast IPv6 address on the VLAN. (No DHCPv6 server is needed.) This
address begins with the hexadecimal prefix fe80, which is prepended to the
interface identifier part of the address. (The interface identifier is generated
from the MAC address of the VLAN itself, using the 64-bit extended unique
identifier (EUI) method.) This enables the IPv6 nodes on the VLAN to
configure and manage the switch.
Enabling IPv6 address autoconfiguration on a VLAN automatically enables
automatic configuration of global unicast addresses on the VLAN. After
enabling autoconfiguration, a router advertisement (RA) containing an
assigned global address prefix must be received on the VLAN from an IPv6
router on the same VLAN. The resulting address is a combination of the prefix
2-7
Introduction to IPv6
Configuration and Management
and the interface identifier currently in use in the link-local address. Having a
global unicast address and a connection to an IPv6- aware router enables IPv6
traffic on a VLAN to be routed to other VLANs supporting IPv6-aware devices.
(Using software release K.13.01, an external, IPv6- aware router is required to
forward traffic between VLANs.)
Multiple, global unicast addresses can be configured on a VLAN that receives
RAs specifying different prefixes.
DHCPv6 (Stateful) Address Configuration
The IPv6 counterpart to DHCP client for IPv4 operation is DHCPv6. Global
unicast addresses of any scope can be assigned, along withNTP (timep) server
addressing when DHCPv6 server support is available through either of the
following modes:
■
accessible on a VLAN configured on the switch
■
accessible through a connection to a router configured with DHCP relay
IPv6 also allows the option of using stateless autoconfiguration or static
configuration to assign unicast addresses to a VLAN, while using a DHCPv6
server for time server addressing.
Static Address Configuration
Statically configuring IPv6 addresses provides flexibility and control over the
actual address values used on an interface. Also, if a statically configured link-
local address is configured on a static VLAN, the global addresses configured
on the VLAN as the result of router advertisements uses the device identifier
included in the link-local address. Statically configuring an IPv6 address on a
VLAN enables IPv6 on the VLAN if it has not already been enabled.
Default IPv6 Gateway
Instead of using static or DHCPv6 configuration, a default IPv6 gateway for
an interface (VLAN) is determined from the default router list of reachable or
probably reachable routers the switch detects from periodic multicast router
advertisements (RAs) received on the interface. For a given interface, there
can be multiple default gateways, with different nodes on the link using
different gateways. If the switch does not detect any IPv6 routers that are
reachable from a given interface, it assumes (for that interface) that it can
reach only the other devices connected to the interface.
2-8
Introduction to IPv6
Configuration and Management
N o t e
In IPv6 for the switches covered in this guide, the default route cannot be
statically configured. Also, DHCPv6 does not include default route configura-
tion.)
Refer to “Default IPv6 Router” on page 4-28 and “View IPv6 Gateway, Route,
and Router Neighbors ” on page 4-29.
Neighbor Discovery (ND) in IPv6
TheIPv6NeighborDiscoveryprotocoloperates in a mannersimilar tothe IPv4
ARP protocol to provide for discovery of IPv6 devices such as other switches,
routers, management stations, and servers on the same interface. Neighbor
Discovery runs automatically in the default configuration and provides
services in addition to those provided in IPv4 by ARP. For example:
■
Run Duplicate Address Detection (DAD) to detect duplicate unicast
address assignments on an interface. An address found to be a duplicate
isnotused, andthe showipv6 commanddisplaystheaddressasaduplicate.
■
Quickly identify routers on an interface by sending router solicitations
requesting an immediate router advertisement (RA) from reachable
routers.
■
■
If a default router becomes unreachable, locate an alternate (if available
on the interface).
stateless address autoconfiguration. In the latter case, this also includes
the address prefixes to use with stateless address autoconfiguration for
routed destinations. (A DHCPv6 server can also be used for "stateless"
service; that is, for configuring the interface for access to other network
services, but not configuring a global IPv6 unicast address on the inter-
face. Refer to “Neighbor Discovery (ND)” on page 4-17.)
■
■
Use multicast neighbor solicitations to learn the link-layer addresses of
destinations on the same interface and to verify that neighbors to which
traffic is being sent are still reachable.
Sendamulticastneighboradvertisementinresponsetoasolicitationfrom
another device on the same interface or to notify neighbors of a change
■
■
Advertise anycast addresses that may be configured on the device.
Determine the MTU (Maximum Transmission Unit) for the interface from
router advertisements.
For more on IPv6 neighbor discovery applications, refer to “Neighbor
Discovery (ND)” on page 4-17.
2-9
Introduction to IPv6
Configuration and Management
IPv6 Management Features
The switch's IPv6 management features support operation in an environment
employing IPv6 servers and management stations.With a link to a properly
configured IPv6 router, switch management extends to routed traffic solu-
tions. (Refer to the documentation provided for the IPv6 router.) Otherwise,
IPv6 management for the switches covered by this guide are dependent on
switched management traffic solutions.
TFTPv6 Transfers
The switch supports these downloads from an IPv6 TFTP server:
■
■
■
■
■
■
automatic OS download
manual OS download
command script download and execution
configuration file downloads
public key file downloads
startup configuration file downloads
The switch supports these uploads to an IPv6 TFTP server
■
■
■
■
■
startup or running configuration upload
OS upload from flash in current use (primary or secondary)
event log content upload
crash log content upload
output of a specified command
Refer to “TFTP File Transfers Over IPv6” on page 5-15.
IPv6 Time Configuration
The switch supports both Timepv6 and SNTPv6 time services. Refer to “SNTP
and Timep” on page 5-9.
Telnet6
The switch supports both of the following Telnet6 operations:
■
Enable (the default setting) or disable Telnet6 access to the switch from
remote IPv6 nodes.
■
Initiate an outbound telnet session to another IPv6 networked device.
Refer to “Telnet6 Operation” on page 5-6
2-10
Introduction to IPv6
IP Preserve
IP Preserve operation preserves both the IPv4 and IPv6 addresses configured
on VLAN 1 (the default VLAN) when a configuration file is downloaded to the
switch using TFTP. Refer to “IP Preserve for IPv6” on page 5-23.
Multicast Listener Discovery (MLD)
default state (MLD disabled), the switch floods all IPv6 multicast traffic it
receives on a given VLAN through all ports on that VLAN except the port
receiving the inbound multicast traffic. Enabling MLD imposes management
controls on IPv6 multicast traffic to reduce unnecessary bandwidth usage.
MLD is configured per- VLAN. For information on MLD, refer to the chapter
titled “Multicast Listener Discovery (MLD) Snooping”.
Web Browser Interface
For the web browser interface, software release K.13.01 adds the following
IPv6 functionality:
■
configure and display IPv6 addressing
ping6 diagnostic operation
■
Configurable IPv6 Security
This section outlines the configurable IPv6 security features supported in
software release K.13.01. For further information on these features, refer to
the indicated pages.
SSHv2 on IPv6
SSHv2 provides for the authentication between clients and servers, and
protection of data integrity, and privacy. It is used most often to provide a
secure alternative to Telnet and is also used for secure file transfers (SFTP
and SCP). Software release K.13.01 with SSHv2 on IPv6 extends to IPv6
devices the SSH functionality that has been previously available on ProCurve
switches running IPv4. This means that SSH version 2 connections are
2-11
Introduction to IPv6
Configurable IPv6 Security
supported between the switch and IPv6 management stations when SSH on
the switch is also configured for IPv6 operation. The switch now offers these
SSHv2 connection types:
■
■
■
IPv6 only
IPv4 only
IPv4 or IPv6
The switch supports up to six inbound sessions of the following types in any
combination at any given time:
■
■
■
■
■
■
SSHv2
SSHv2 IPv6
Telnet-server
Telnet6-server
SFTP/SCP
Console (serial RS-232 connection)
For more information, refer to “Secure Shell for IPv6” on page 6-15.
IP Authorized Managers
The IPv6 Authorized IP Managers feature, like the IPv4 version, uses IP
addresses and masks to determine which stations (PCs and workstations) can
access the switch through the network, and includes these access methods:
■
■
■
Telnet, SSH, and other terminal emulation applications
the switch's web browser interface
SNMP (with a correct community name)
Also, when configured in the switch, the access control imposed by the
Authorized IP Manager feature takes precedence over the other forms of
access control configurable on the switch, such as local passwords, RADIUS,
and both Port-Based and Client-Based Access Control (802.1X). This means
that the IP address of a networked management device must be authorized
before the switch will attempt to authenticate the device by invoking any other
access security features. Thus, with Authorized IP Managers configured,
having the correct passwords or MAC address is not sufficient for accessing
the switch through the network unless an IPv6 address configured on the
station attempting the access is also included in the switch's Authorized IP
Managers configuration. This presents the opportunity to combine the Autho-
rized IP Managers feature with other access control features to enhance the
security fabric protecting the switch.
2-12
Introduction to IPv6
Diagnostic and Troubleshooting
C a u t i o n
The Authorized IP Managers feature does not protect against unauthorized
port. Also, if an unauthorized station “spoofs” an authorized IP address, then
the unauthorized station cannot be blocked by the Authorized IP Managers
feature, even if a duplicate IP address condition exists.
To configure authorized IPv6 managers, refer to “Authorized IP Managers for
IPv6” on page 6-3.
For related information, refer to:
■
RFC 4864, “Local Network Protection for IPv6”.
Diagnostic and Troubleshooting
Software release K.13.01 includes the IPv6 diagnostic and troubleshooting
features listed in this section.
ICMP Rate-Limiting
Controlling the frequency of ICMPv6 error messages can help to prevent DoS
(Denial- of- Service) attacks. With IPv6 enabled on the switch, you can control
the allowable frequency of these messages with ICMPv6 rate-limiting. Refer
Ping6
Implements the Ping protocol for IPv6 destinations, and includes the same
options as are available for IPv4 Ping, including DNS hostnames. Refer to
“Ping for IPv6 (Ping6)” on page 8-4.
Traceroute6
Implements Traceroute for IPv6 destinations, and includes the same same
options as are available for the IPv4 Traceroute, including DNS hostnames.
Refer to “Traceroute for IPv6” on page 8-6.
2-13
Introduction to IPv6
Diagnostic and Troubleshooting
Domain Name System (DNS) Resolution
This feature enables resolving a host name to an IPv6 address and the reverse,
and takes on added importance over its IPv4 counterpart due to the extended
length of IPv6 addresses. With DNS-compatible commands, CLI command
entry becomes easier for reaching a device whose IPv6 address is configured
with a host name counterpart on a DNS server.
Software release K.13.01 includes the following DNS-compatible commands:
■
ping6
■
traceroute6
The switches covered by this guide now support a prioritized list of up to three
DNS server addresses. (Earlier software releases supported only one DNS
server address.) Also, the server address list can include both IPv4 and IPv6
DNS server addresses. (An IPv6 DNS server can respond to IPv4 queries, and
the reverse.)
N o t e
If an IPv6 DNS server address is configured on the switch, at least one VLAN
on the switch (and in the path to the DNS server) must be configured with an
IPv6 address.
For information on configuring DNS resolution on the switch, refer to “DNS
Resolver for IPv6” on page 8-9.
IPv6 Neighbor Discovery (ND) Controls
The neighbor discovery feature includes commands for:
■
increasing or decreasing the frequency of Duplicate Address Detection
searches
■
■
displaying the IPv6 neighbor cache
clearing dynamic entries from the neighbor cache
Refer to “Neighbor Discovery (ND) in IPv6” on page 2-9.
Event Log
Messages returning IP addresses now include IPv6 addresses where appli-
cable.
2-14
Introduction to IPv6
IPv6 Scalability
SNMP
When IPv6 is enabled on a VLAN interface, you can manage the switch from
a network management station configured with an IPv6 address. Refer to
“SNMP Management for IPv6” on page 5-20.
Loopback Address
Like the IPv4 loopback address, the IPv6 loopback address (::1) can be used
by the switch to send an IPv6 packet to itself. However, the IPv6 loopback
address is implicit on a VLAN and cannot be statically configured on any
VLAN. Refer to “Loopback Address” on page 3-24.
Debug/Syslog Enhancements
Includes new options for IPv6. Refer to “Debug/Syslog for IPv6” on page 8-12.
IPv6 Scalability
As of software release K.13.01, the switches covered by this guide support the
following:
■
■
■
■
Dual stack operation (IPv4 and IPv6 addresses on the same VLAN).
Maximum of 512 VLANs with IPv4 and IPv6 addresses in any combination.
Up to 2048 VLANs configured on the switch.
Maximum of 2048 active IPv6 addresses on the switch, in addition to a
maximum of 2048 IPv4 addresses. (“Active IPv6 addresses” includes the
total of all preferred and non-preferred addresses configured statically,
through DHCPv6, and through stateless autoconfiguration. Excluded
from “Active IPv6 Addresses” is the link-local address assigned to each
VLAN, and “on- link” prefixes received as part of a router advertisement.)
■
■
Maximum of 32 IPv6 addresses on a VLAN.
Maximum of 10,000 IPv6 routes.
For more information on VLAN and route scalability on the switches covered
by this guide, refer to the appendix titled “Scalability: IP Address, VLAN, and
Routing Maximum Values” in the Management and Configuration Guide for
your switch.
2-15
Introduction to IPv6
Path MTU (PMTU) Discovery
Path MTU (PMTU) Discovery
IPv6 PMTU operation is managed automatically by the IPv6 nodes between
the source and destination of a transmission. For Ethernet frames, the default
MTU is 1500 bytes. If a router on the path cannot forward the default MTU
size, it sends an ICMPv6 message (PKT_TOO_BIG) with the recommended
MTU to the sender of the frame. If the sender of the frame is an IPv6 node
that supports PMTU discovery, it will then use the MTU specified by the router
and cache it for future reference.
For related information, refer to:
■
RFC 1981: “Path MTU Discovery for IP version 6”
2-16
3
IPv6 Addressing
Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-3
IPv6 Address Structure and Format . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-3
Address Format . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-3
Address Notation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-3
Network Prefix . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-4
Interface (Device) Identifier . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-4
IPv6 Addressing Options . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-5
IPv6 Address Sources . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-5
IPv6 Address Sources . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-7
Applications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-7
Addresses . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-7
Stateful (DHCPv6) Address Configuration . . . . . . . . . . . . . . . . . . . . . . 3-8
Static Address Configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-9
Address Types and Scope . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-10
Address Types . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-10
Address Scope . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-11
Unicast Address Prefixes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-11
Link-Local Unicast Address . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-13
Autoconfiguring Link-Local Unicast Addresses . . . . . . . . . . . . . . . . . 3-13
Extended Unique Identifier (EUI) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-14
Statically Configuring Link-Local Addresses . . . . . . . . . . . . . . . . . . . . 3-15
Global Unicast Address . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-16
Stateless Autoconfiguration of a Global Unicast Address . . . . . . . . . 3-16
Static Configuration of a Global Unicast Address . . . . . . . . . . . . . . . 3-17
3-1
IPv6 Addressing
Contents
Anycast Addresses . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-20
Multicast Application to IPv6 Addressing . . . . . . . . . . . . . . . . . . . . . . 3-21
Overview of the Multicast Operation in IPv6 . . . . . . . . . . . . . . . . . . . . 3-21
Loopback Address . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-24
The Unspecified Address . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-25
IPv6 Address Deprecation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-25
Preferred and Valid Address Lifetimes . . . . . . . . . . . . . . . . . . . . . . . . . 3-25
3-2
IPv6 Addressing
Introduction
Introduction
IPv6 supports multiple addresses on an interface, and uses them in a manner
comparable to subnetting an IPv4 VLAN. For example, where the switch is
configured with multiple VLANs and each is connected to an IPv6 router, each
VLAN will have a single link-local address and one or more global unicast
addresses. This section describes IPv6 addressing and outlines the options for
configuringIPv6addressingontheswitch. Theconfigurationprocessincludes
automatically or statically creating an IPv6 address and automatically veri-
fying the uniqueness of each.
IPv6 Address Structure and Format
Address Format
An IPv6 address is composed of 128 bits divided into eight 2-byte fields of
hexadecimal values. The full format is:
xxxx : xxxx : xxxx : xxxx : xxxx : xxxx : xxxx : xxxx
where each field delimited by a colon (:) is a set of four hexadecimal digits.
For example:
2001:0db8:0000:00A9:0215:60ff:fe7a:adc0
2001:0db8:0260:0212:0000:0000:0000:01b4
The hexadecimal characters in IPv6 addresses are not case-sensitive.
Address Notation
Leading zeros in each field can be omitted as long as each field is represented
by at least one value. The exception to this rule is when there is an uninter-
rupted series of zeros in one or more contiguous fields. In this case, the series
of zeros can be replaced by “::”, with the restriction that “::” can be used only
once in a given address. Applying this convention to the above examples
results in the following address notations:
2001:db8::a9:215:60ff:fe7a:adc0
2001:db8:260:0212::01b4
3-3
IPv6 Addressing
IPv6 Address Structure and Format
An IPv6 address includes a network prefix and an interface identifier.
Network Prefix
The network prefix (high-order bits) in an IPv6 address begins with a well-
known, fixed prefix for defining the address type. Some examples of well-
known, fixed prefixes are:
2000::/3global (routable) unicast address
fd08::/8 unique local unicast address
fe80::/8link-local unicast address
ff00::/8multicast address
The remainder of the network prefix depends on the prefix type, and includes
information such as the subnet destination of unicast addresses or the flags
and scope of multicast addresses.
In a given address, CIDR-type notation (Classless Inter-Domain Routing) is
used to define the network prefix. In the following address example, the 64
bits comprising 2001:0db8:0260:0201 form the network prefix:
2001:0db8:0260:0212:0215:60ff:fe7a:adc0/64
A shorter way to show this address is to remove the leading zeros:
2001:db8:260:212:215:60ff:fe7a:adc0/64
Interface (Device) Identifier
The remaining (low-order) bits in the address comprise a unique interface
identifier in an IPv6 address. In the above example, the rightmost 64 bits
(215:60ff:fe7a:adc0) comprise the interface identifier. Unlike IPv4, an IPv6
identifierfor aunicastoranycast addresscan be automaticallygeneratedfrom
the switch's MAC address using EUI-64 (Extended Unique Identifier) format.
Other methods include DHCPv6 assignments and static configuration. Inter-
face identifiers are covered in more detail in the later sections of this chapter
describing different address types.
3-4
IPv6 Addressing
IPv6 Addressing Options
IPv6 Addressing Options
IPv6 Address Sources
IPv6 addressing sources provide a flexible methodology for assigning
addresses to VLAN interfaces on the switch. Options include:
■
stateless IPv6 autoconfiguration on VLAN interfaces includes:
•
•
link-local unicast addresses
global unicast addresses
■
■
stateful, global unicast IPv6 address configuration using DHCPv6
static IPv6 address configuration
You can combine stateless, stateful, and static IP addressing methods on the
switch as needed, according to the needs in your network. For example, if
your network includes only one VLAN, you may need only stateless autocon-
figuration of link-local addresses, although you could also use the static IPv6
method. (DHCPv6 does not configure link-local addresses.) Where routed
traffic is used, you will also need global unicast addressing, either through
stateless autoconfiguration or the other listed methods.
General IPv6 Address Types
IPv6 supports stateless and stateful address autoconfiguration, as well as
static address configuration.This enables IPv6 to automatically address a
device so that it can be placed in a network with or without static or DHCPv6
addressing intervention. All three of these methods can be used exclusively
or in conjunction with each other, and a given IPv6 device can have multiple
addresses assigned to the same interface in a manner similar to subnetting in
IPv4.
Stateless Address Autoconfiguration . This method does not require the
use of servers. Instead, in the default operation, the host uses its MAC address
to automatically generate a link-local IPv6 address using the EUI-64 method
Unicast Addresses” on page 3-13.) The scope of the link-local address enables
communication with other IPv6 devices on the same VLAN. If an IPv6 router
is present, an IPv6 address supporting routing is automatically generated, as
well. (The switch merges a router-generated prefix received in router adver-
tisements with the last 64 bits of thelink-local address on an interface to create
the global address.) Refer to page 3-7.
3-5
IPv6 Addressing
IPv6 Addressing Options
Stateful Address Autoconfiguration. This method allows use of a
manner similar to stateful IP addressing with a DHCPv4 server. For software
release K.13.01, a DHCPv6 server can provide routable IPv6 addressing and
NTP (timep) server addresses. Also, if the host acquires its IPv6 addressing
through stateless or static methods, the DHCPv6 server can still be used to
page 3-8.
Static Address Configuration. Static configuration is used instead of or in
addition to stateless and stateful autoconfiguration where use ofthe hostMAC
address does not provide the desired level of address control and distribution.
Refer to page 3-9.
Duplicate Address Detection (DAD). IPv6verifiesboththelink-localand
the global unicast address(es) on each interface for uniqueness, regardless of
the method used to configure the address. If an address fails this test, it is
identified as a duplicate, and a replacement must be configured using the static
method. (To view address status, use the show ipv6 command.) For more
information on DAD, refer to “Neighbor Discovery (ND)” on page 4-17.
Developing an Addressing Plan. For small, flat networks and any environ-
ment where control of address assignments need not be restricted or tightly
controlled, stateless addressing is adequate for network management and
control. Where systematic and controlled addressing is needed, stateful and
static addressing methods should be used. Where dual-stack operation is used
in a VLAN, incorporating the local IPv4 addressing scheme into the IPv6
addresses you use can help to provide consistency and correspondence
among the IPv6 and IPv4 addresses in use on the VLAN.
Related Information.
■
■
■
RFC 4291: “IP Version 6 Addressing Architecture”
RFC 2462: “IPv6 Stateless Address Autoconfiguration”
RFC 3315: “Dynamic Host Configuration Protocol for IPv6 (DHCPv6)”
3-6
IPv6 Addressing
IPv6 Address Sources
IPv6 Address Sources
IPv6 addressing sources provide a flexible methodology for assigning
addresses to VLAN interfaces on the switch. Options include:
■
stateless IPv6 autoconfiguration on VLAN interfaces includes:
•
•
link-local unicast addresses
global unicast addresses
■
■
stateful IPv6 address configuration using DHCPv6
static IPv6 address configuration
You can combine stateless, stateful, and static IP addressing methods on the
switch as needed, according to the needs in your network. For example, if
your network includes only one VLAN, you may need only stateless autocon-
figuration of link-local addresses, although you could also use the static IPv6
method. (DHCPv6 does not configure link-local addresses.) Where routed
traffic is used, you will also need global unicast addressing, either through
stateless autoconfiguration or the other listed methods.
Stateless Address Autoconfiguration (SLAAC)
On the switches covered by this guide, stateless address autoconfiguration
(SLAAC) generates link-local unicast and global unicast IPv6 addresses on a
VLAN interface. In all cases, the prefix is 64 bits.
Applications
Stateless autoconfiguration is suitable where a link-local or global unicast
IPv6 address (if a router is present) must be unique, but the actual address
used is not significant. Where a specific unicast address or a unicast address
from a specific range of choices is needed on an interface, DHCPv6 or static
IPv6 address configuration should be used. (Refer to pages 3-8 and 3-9.)
Preferred and Valid Lifetimes of Stateless Autoconfigured
Addresses
The preferred and valid lifetimes of an autoconfigured global unicast address
are set by the router advertisements (RA) used to generate the address, and
are the autoconfiguration counterpart to the lease time assigned by DHCPv6
3-7
IPv6 Addressing
IPv6 Address Sources
servers. These lifetimes cannot be reset using control from the switch console
or SNMP methods. Refer to “Preferred and Valid Address Lifetimes” on page 3-
25.
Stateful (DHCPv6) Address Configuration
Stateful addresses are defined by a system administrator or other authority,
and automatically assigned to the switch and other devices through the
Dynamic Host Configuration Protocol (DHCPv6). Generally, DHCPv6 should
be applied when you want specific, non-default addressing to be assigned
automatically. For IPv6, DHCP use is indicated for conditions such as the
following:
■
■
■
■
address conventions used in your network require defined control
static addressing is not feasible due to the number of nodes in the network
automatic assignment of multiple IPv6 addresses per interfaces is needed
automatic configuration of IPv6 access to DNS, SNTP, or TimeP servers
To implement stateful address configuration:
■
The DHCPv6 server must be configured and accessible to the switch,
either on the same VLAN or through an IPv6 router configured with DHCP
Relay to support service requests from the switch.
N o t e
DHCPv6 relay may not currently be available in some IPv6 routers.
DHCPv6 addressing must be enabled per-VLAN on the switch.
■
Note that IPv6 router advertisements (RAs) can also include instructions to
clients to use DHCPv6 resources. Refer to the documentation for your IPv6
router.
If you want to use DHCPv6 in a dual-stack environment, you will need both
DHCPv4 and DHCPv6 server access. Also, further developments in DHCP
services are likely to mean new capabilities affecting DHCPv6 deployments.
For related information, refer to:
■
RFC 3315: “Dynamic Host Configuration Protocol for IPv6 (DHCPv6)”
■
RFC 3041: “Privacy Extensions for Stateless Address Autoconfiguration
in IPv6”
3-8
IPv6 Addressing
IPv6 Address Sources
Static Address Configuration
Generally, static address configuration should be used when you want
specific, non-default addressing to be assigned to a VLAN interface. For IPv6,
DHCP use is indicated for conditions such as the following:
■
address conventions used in your network require defined control
■
the task of static addressing is not so extensive as to be impractical due
to the number of addresses and/or interfaces needing configuration
If IPv6 is not already enabled on a VLAN interface, the following is true:
■
Statically configuring a link-local address on the interface also enables
IPv6.
■
Statically configuring a global unicast or anycast address also enables
IPv6 and generates a link-local address.
Statically configured global unicast addresses can be used in addition to
stateless addresses on the same interface. However, because only one link-
local address is allowed on a VLAN interface (fe80::), static configuration of
a link-local address automatically replaces an existing link-local address.
N o t e
For a statically configured global unicast address to be routable, a gateway
router must be transmitting router advertisements on the VLAN that include
theprefixusedinthestaticallyconfiguredaddress. IftheVLANisnotreceiving
an RA with this prefix, the address is listed as “preferred”, but is not used.
Statically configured IPv6 addresses saved to the startup-config file (by using
write memory) remain across a reboot and are permanent, unless statically
removed by no ipv6 address < ipv6-addr >.
For more information and the CLI command for static address configuration,
refer to “Configuring a Static IPv6 Address on a VLAN” on page 4-11.
3-9
IPv6 Addressing
Address Types and Scope
Address Types and Scope
Address Types
IPv6 uses these IP address types:
■
Unicast: Identifies a specific IPv6 interface. Traffic having a unicast
destination address is intended for a single interface. Like IPv4 addresses,
unicast addresses can be assigned to a specific VLAN on the switch and
to other IPv6 devices connected to the switch. At a minimum, a given
interface must have at least a link-local address. To send or receive traffic
off of a VLAN, an interface must also have one or more global unicast
addresses.
■
Multicast: Provides a single destination address for traffic intended for
all members of a group, and provides a means for reducing unnecessary
traffic to interfaces that do not belong to a given multicast group. Member-
ship in a group can be determined by request or by a characteristic, such
as all nodes, all routers, or all routers of a given type. Multicast traffic can
be generated by a single source or multiple sources, but in either case is
include streaming video and audio to multiple receivers who have joined
a specific group from diverse locations.
N o t e
Unlike IPv4, broadcast addresses are not used in IPv6. Multicast addresses
are used instead. For more on this topic, refer to “Multicast Application to
IPv6 Addressing” on page 3-21.
■
Anycast: A single address of this type can be assigned to multiple
interfaces, possibly on separate devices within a defined address scope,
where any of the interfaces having the anycast address can provide the
desired service or response. A packet sent to a given anycast address is
delivered only to the nearest interface having an instance of the address.
This option is useful where multiple servers provide the same service, and
it does not matter to the client which source it uses to acquire the service.
Anycast usage can be of value, for example, in a network supporting
multiple DNS servers. Refer to “Anycast Addresses” on page 3-20.
A given interface can have only one link-local address, but can have multiple
unicast and anycast addresses.
3-10
IPv6 Addressing
Address Types and Scope
Address Scope
The address scope determines the area (topology) in which a given IPv6
address is used. This section provides an overview of IPv6 address types. For
more information, refer to the chapter titled “IPv6 Addressing”.
Link-Local Address. Limited to a given interface (VLAN). Enabling IPv6 on
a given VLAN automatically generates a link-local address used for switched
traffic on the VLAN.
Global Unicast Address. Applies to a unique IPv6 routable address on the
internet. A unique global address has a routing prefix and a unique device
identifier.When autoconfiguration is enabled on a VLAN receiving an IPv6
router advertisement (RA), the prefix specified in the RA and the device
identifier specified in the link-local address are combined to create a unique,
global unicast address. A global unicast address can also be statically config-
ured to either replace or complement an automatically configured address of
the same type.
Unique Local Unicast. Applies to a routable, globally unique address
intended for use within an entity defined by the system adminstrator, such as
addresses are intended to be routable on a local site or an organization's
intranet, but are not intended to be routed on the global internet. A unique
local unicast address has the same format as a global unicast address. In this
guide, unless otherwise stated, information on global unicast addresses also
applies to unique local unicast addresses. For more on this topic, refer to
“Unique Local Unicast IPv6 Address” on page 3-19.
Unicast Address Prefixes
Traffic having a unicast destination address is intended for a single interface
identified by that address. While IPv6 unicast addresses can have prefixes of
varying length, a 64-bit prefix is generally adequate.
Link-Local Unicast Prefix (fe80): This well-known 64-bit fixed prefix is for
a non- routable address used to identify a device on a single VLAN interface,
and requires the high-order ten bits to be set to fe80 (fe80::/10). The remaining
54 bits in the prefix are set to zeros, followed by an interface ID of 64 bits.
fe80:0000:0000:0000:0215:60ff:fe7a:adc0/64
or
fe80::215:60ff:fe7a:asc0/64
3-11
IPv6 Addressing
Address Types and Scope
In binary notation, the fixed prefix for link-local prefixes is:
1111 1110 10 = fe80/10
For more on link-local addresses, refer to “Link-Local Unicast Address” on
page 3-13.
Routable Global Unicast Prefix. This well-known 3-bit fixed-prefix indi-
cates a routable address used to identify a device on a VLAN interface that is
accessible by routing from multiple networks. The complete prefix is 64 bits,
followed by a 64-bit interface identifier. For example, the leading 2 in the first
octet of the following address illustrates a global unicast address:
2001:db8:260:212:215:60ff:fe7a:adc0/64
In binary notation, the fixed prefix in this example appears as follows:
0010 0000 = 20/3
Unique Local Unicast Prefix (fd). Thiswell-knownfixedprefixisdefined
as FC00/7. However, the eighth high-order bit must also be set to 1, resulting
in a fixed prefix of fd00/8. (In the future, setting the eighth high-order bit to
zero may become an option.) This prefix signifies a routable address intended
leading fd in the first octet of this address illustrates a unique local unicast
address intended to be used in a privately defined network.
fd00:00ff:0C00:000a:215:60ff:fe7a:adc0
Unique local unicast addresses are described in more detail under "Unique
Local Unicast IPv6 Address" on page 3-19.
for flags and scope for the multicast address. The remaining 112 bits define
the multicast group identifier. For example:
ff02::1:ffc7:b5b9
For more information, refer to “Multicast Application to IPv6 Addressing” on
page 3-21.
3-12
IPv6 Addressing
Link-Local Unicast Address
Other Prefix Types. There are other designated global unicast prefixes
such as those for the following address types:
■
■
■
RFC 4380: “Teredo: Tunneling IPv6 over UDP”
RFC 3056: “Connection of IPv6 Domains via IPv4 Clouds”
RFC 4214: “Intra-Site Automatic Tunnel Addressing Protocol (ISATAP)”
For related information, refer also to:
RFC 4291: "IP Version 6 Addressing Architecture
■
Link-Local Unicast Address
A link-local unicast address is a non-routable address for use on a single VLAN
interface, and provides basic connectivity to an IPv6 network. Because the
scope of a link-local address is restricted to the VLAN on which the address
is used, a link-local address must be unique only for the VLAN on which it is
configured. (Traffic with a link-local source or destination address cannot be
routed between VLANs.)
Autoconfiguring Link-Local Unicast Addresses
Enabling IPv6 on a given VLAN automatically generates a link-local address.
This address is limited in scope to that VLAN, and is usable only for switched
traffic. This address has a well- known, 64-bit prefix of fe80:0000:0000:0000
(hexadecimal), or fe80::, and a 64-bit device identifier derived from the VLAN's
MAC address using the Extended Unique Identifier format (EUI-64, page 3-
14). For example, if the MAC address of VLAN 10 is 021560-7aadc0, the
automatically generated link-local address for VLAN 10 is:
fe80:0000:0000:0000:0215:60ff:fe7a:adc0
or, in standard IPv6 notation,
fe80::215:60ff:fe7a:adc0
Note that only one link-local address is allowed on an interface. Thus, on a
given interface, statically configuring a link-local address type replaces the
existing link-local address.
3-13
IPv6 Addressing
Link-Local Unicast Address
Because all VLANs configured on the switch use the same MAC address, all
automatically generated link-local addresses on the switch will have the same
link-local address. However, since the scope of a link-local address includes
only the VLAN on which it was generated, this should not be a problem.
For example, executing ipv6 address dhcp full on a VLAN for which IPv6 was
not previously configured does all of the following:
■
enables IPv6 on the VLAN
■
causes the switch to generate a stateless link-local unicast address on the
VLAN
■
configures the VLAN to send DHCPv6 requests
N o t e
Only one link-local unicast address can exist on a VLAN interface at any time.
Configuring a new address of this type on an interface on which IPv6 is already
enabled replaces the previously existing link-local address with the new one.
fe80::/64 plus a 64-bit device identifier.
Any of the following commands enable IPv6 on a VLAN and automatically
generate a link-local address:
■
■
■
■
ipv6 enable (page 4-6)
ipv6 address autoconfig (page 4-7)
ipv6 address dhcp full [rapid-commit] (page 4-9)
ipv6 address < network-prefix><device-id >/< prefix-length > (page 4-13)
Extended Unique Identifier (EUI)
When the link-local address is automatically generated, the device identifier
is derived from the switch's 48- bit (hexadecimal) MAC address to create a 64-
bit Extended Unique Identifier (EUI) to be appended to the fe80 link-local
prefix, as follows:
■
ff-fe is inserted between third and fourth bytes of MAC address
■
The second low-order bit (the Universal/Local bit) in the first byte of the
MAC address is complemented, which usually means the bit is originally
set to 0 and is changed to 1. This indicates a globally unique IPv6 interface
identifier. For example:
3-14
IPv6 Addressing
Link-Local Unicast Address
MAC Address
IPv6 I/F Identifier
Full Link-Local Unicast
Address
00-15-60-7a-ad-c0
215:60ff:fe7a:adc0
fe80::215:60ff:fe7a:adc0/64
09-c1-8a-44-b4-9d
00-1a-73-5a-7e-57
11c1:8aff:fe44:b49d
21a:73ff:fe5a:7e57
fe80::11c1:8aff:fe44:b49d/64
fe80::21a:73ff:fe5a:7e57/64
The EUI method of generating a link-local address is automatically imple-
mented on the switches covered by this guide when IPv6 is enabled on a VLAN
interface.
If automatically generated link-local addresses are not suitable for the
addressing scheme you want to use, statically assigned link-local addresses
can be used instead. (Refer to “Static Address Configuration” on page 3-9.)
For related information, refer to:
■
RFC 2373: “IP Version 6 Addressing Architecture”
■
RFC 2464: “Transmission of IPv6 Packets Over Ethernet Networks”
N o t e
While only one link-local IPv6 address is allowed on an interface, multiples of
other address types can exist on the same interface. Thus, an interface can
have one link-local unicast address, but multiple global unicast, anycast, and
unique local addresses.
Statically Configuring Link-Local Addresses
If IPv6 is not already enabled on the VLAN, this action also enables IPv6 on
the VLAN. Only one link-local address can exist on a VLAN at any time. If a
link-local address (static or autoconfigured) already exists on the VLAN, then
statically configuring a new one replaces the previously existing one. To
statically configure a link-local address, refer to “Statically Configuring a Link-
Local Unicast Address ” on page 4-12.
3-15
IPv6 Addressing
Global Unicast Address
Global Unicast Address
VLANs within an organization as well as across the public internet. To support
on a VLAN:
■
stateless address autoconfiguration using a prefix received in an adver-
tisement received from a router on the VLAN (page 3-7)
■
■
stateful address configuration using DHCPv6 (page 3-8)
static address configuration (page 3-9)
Stateless Autoconfiguration of a Global Unicast
Address
If there is an IPv6-enabled router transmitting router advertisements on a
VLAN interface, enabling this method generates a global, routable unicast
address for the VLAN. The prefix for this address type is typically 64 bits with
the three highest-order bits set to 2.
Router Advertisements. With autoconfiguration enabled, if the switch
receives the same prefix from router advertisements (RAs) from multiple IPv6
routers on the same VLAN, then one global unicast address is configured with
thatprefix. Ifdifferentprefixesarereceivedfromdifferentroutersonthesame
VLAN, then there will be one address configured on the VLAN for each unique
prefix received. Where there are multiple routers on the VLAN, the default
the RAs the VLAN receives. If the highest priority is duplicated on multiple
routers, then the first RA detected on the VLAN determines the default route.
If the RA used to define the prefix for an autoconfigured address ceases to be
received on the VLAN, then the address becomes deprecated. (Refer to “IPv6
Address Deprecation” on page 3-25.)
If IPv6 is not already enabled on a VLAN when you enable autoconfiguration
on the VLAN, then the switch automatically generates a link-local address for
the VLAN as well.
If IPv6 Is Not Already Enabled. Enabling address autoconfiguration on a
VLAN when IPv6 is not already enabled on the VLAN causes the switch to:
3-16
IPv6 Addressing
Global Unicast Address
■
■
generate a link-local address on the VLAN as described in the preceeding
section (page 3-13).
transmit a router solicitation on the VLAN, and to listen for advertise-
ments from any IPv6 routers on the VLAN.
For each unique router advertisement (RA) the switch receives from any
router(s), the switch configures a unique, global unicast address. This address
type is composed of a 64-bit network prefix specified by the router advertise-
ment, plus a device identifier generated in the same way as described in the
preceeding section for link-local addresses (using the EUI algorithm). For
example, suppose the following is true:
■
■
■
IPv6 is not enabled on VLAN 1.
The MAC address for VLAN 1 is 00-15-60-7a-ad-c0.
A router on the same VLAN transmits router advertisements that assign
the prefix 2001:0:260:212/64, plus a 64-bit interface identifier generated
using the EUI format.
In this case, enabling IPv6 address autoconfiguration on VLAN 1 generates the
following address assignments on VLAN 1:
■
link-local unicast: fe80::215:60ff:fe7a:adc0/64
■
global unicast:2001:0:260:212:215:60ff:fe7a:adc0/64
IPv6 Already Enabled. Enabling address autoconfiguration on a VLAN
when IPv6 is already enabled on the VLAN creates a global unicast address in
the same way as described above, except that the device identifier applied to
the new global address is a duplicate of the 64-bit identifier in the current link-
local address.
N o t e
After a global unicast address has been configured, its device identifier will
not be changed by any later changes to the link-local address.
A global unicast address can be configured statically on a VLAN interface. If
IPv6 is not already enabled on a VLAN, then statically configuring a global
unicast address automatically generates a link-local unicast address on the
VLAN, as described in the pdreceeding section. To statically configure a global
unicast address, refer to “Statically Configuring A Global Unicast Address” on
page 4-13.
3-17
IPv6 Addressing
Global Unicast Address
Prefixes in Routable IPv6 Addresses
In routable IPv6 addresses, the prefix uniquely identifies an entity and a
unicast subnet within that entity, and is defined by a length value specifying
the number of leftmost contiguous (high-order) bits comprising the prefix.
For an automatically generated global unicast address, the default prefix
length is 64 bits. (Pratically speaking, the entire prefix in a /64 address defines
the subnet.) Prefixes configured through stateful or static methods can be any
length compatible with the local network application.
In the following example, the leftmost 64 bits of the address comprise the
prefix:
2001:0db8:0000:0212:0215:60ff:fe7a:adc0/64
or
2001:db8::212:215:60ff:fe7a:adc0/64
In this case, the prefix is read as:
2001:0db8:0000:0212::
or
2001:db8::212::
All bits to the right of 0212 comprise the device identifier in the unicast
address.
For related information, refer to:
■
RFC 3177: “IAB/IESG Recommendations on IPv6 Address Allocations to
Sites”
■
RFC 4291: “IP Version 6 Addressing Architecture”
3-18
IPv6 Addressing
Unique Local Unicast IPv6 Address
Unique Local Unicast IPv6 Address
A unique local unicast address is an address that falls within a specific range,
but is used only as a global unicast address within an organization. Traffic
having a source address within the defined range should not be allowed
beyond the borders of the intended domain or onto the public internet.
The current prefix for specifically identifying unique local unicast addresses
is fd00/8. The leftmost 64 bits of a unique local unicast address include:
■
■
■
the well-known prefix “fd”
a 40-bit global identifier
a 16-bit subnet identifier
For example:
fd73:110:255:23:215:60ff:fe7a:adc0/64
In the above case, the following values are used with the well-known prefix
and L-bit setting:
■
■
■
global identifier: 0073:110:255
subnet identifier: 23
interface identifier: 215:60ff:fe7a:adc0
Unique local unicast addresses can be assigned by router advertisements,
DHCPv6 servers, or static configuration. The boundaries for unique local
unicast address are set by border routers. Unique local unicast addresses can
be assigned in DNS servers supporting an internal network, but should not be
included in global DNS assignments.
For related information, refer to:
■
RFC 4193: “Unique Local IPv6 Unicast Addresses”
3-19
IPv6 Addressing
Anycast Addresses
Anycast Addresses
Network size, traffic loads and the potential for network changes make it
desirable to build in redundancy for some network services to provide
increased service reliability. Anycast addressing provides this capability for
applications where it does not matter which source is actually used to provide
a service that is offered on multiple sources. Some applications that can
benefit from anycast addressing include:
■
■
■
■
■
DNS (UDP)
time servers
multicast rendezvous
syslog devices
gateways to a common network area.
Similarly, it is also useful in some cases to economically provide redundant
paths to a given entity, such as a specific service provider. With IPv6 this can
be done efficiently using the anycast address capability to assign the same
address to multiple devices providing access to the desired services. An added
benefit of utilizing anycast addresses is to reduce the need to configure clients
with the addresses of multiple devices offering the same service.
An anycast address is an identifier for a set of interfaces typically belonging
to different nodes. Packets sent to an anycast address are delivered to one of
the interfaces identified as the “nearest” address, according to the routing
protocol's measure of distance.
N o t e
Equal-Cost paths between a host and multiple instances of the same anycast
address can result in different packets in the same communication session to
be sent to different destinations, and should be avoided.
Ananycastaddress isformatted the same as a unicastaddress. For this reason,
configuring an anycast address on the switch includes using an anycast
keyword as part of the command. The prefix for an anycast address should
include all areas of the network in which the address is used. For information
on configuring an anycast address on the switches covered by this guide, refer
to “Statically Configuring An Anycast Address” on page 4-14.
N o t e
Duplicate Address Detection (DAD) does not apply to anycast addresses.
3-20
IPv6 Addressing
Multicast Application to IPv6 Addressing
For related information, refer to:
■
RFC 4291: “IP Version 6 Addressing Archetecture”
RFC 2526: “Reserved IPv6 Subnet Anycast Addresses”
■
Multicast Application to IPv6 Addressing
Multicast is used to reduce traffic for applications that have more than one
recipient for the same data. IPv6 also uses multicast for purposes such as
providing a more defined control of administrative traffic on a VLAN interface
than can be achieved with the broadcast method used by IPv4. This approach
improves traffic control for such purposes as neighbor and router solicita-
tions, router advertisements, and responses to DAD messages. It also avoids
the bandwidth consumption used for broadcasts by narrowing the scope of
possibly interested destinations for various types of messages.
Overview of the Multicast Operation in IPv6
When IPv6 is enabled on a VLAN interface on the switch, the interface
automatically joins the All-Nodes and Solicited-Node multicast address
groups for each of its configured unicast and anycast addresses. The interface
also attempts to learn of other devices by sending solicitations to additional,
well-known multicast groups, such as the following:
■
all routers
■
all MLDv2-capable routers, if multicast listener discovery (MLD) is
enabled on the interface
■
all DHCP agents (if DHCP is enabled on the interface)
There is a separate, solicited node multicast group for each IPv6 unicast and
anycast address configured on a given interface. These automatically gener-
ated groups are limited in scope to the VLANs on which the node resides.
Where multiple IPv6 unicast or anycastaddresses on the same node differ only
in their prefixes, they join the same solicited-node multicast group. Solicited-
Node multicast groups are used, for example, in autoconfiguration. In this
solicited-node multicast address for the proposed link-local address, then
sends a Neighbor solicitation to this solicited-node multicast address. If there
is no response from another node, the proposed address is available for use.
For more on Neighbor Discovery, refer to “Neighbor Discovery (ND)” on
page 4-17.
3-21
IPv6 Addressing
Multicast Application to IPv6 Addressing
For information on Multicast Listener Discovery (MLD) refer to the chapter
titled “Multicast Listener Discovery (MLD) Snooping”.
When MLD is enabled on an interface, you can use show ipv6 mld [ vlan < vid >]
to list the active multicast group activity the switch has detected per interface
from other devices.
IPv6 Multicast Address Format
The multicast address format has three principal sections in the leading 16
bits:
■
■
■
identifier: ff (bits 1-8)
flags: 0xxx (bits 9-12)
scope: 0001 - 1110 (bits 13-16)
For related information, refer to RFC 4291.
Multicast Group Identification
Multicast ID, Flags and Scope (16 bits)
Group Identifier (112 bits)
x...x : x...x : x...x : x...x : x...x : x...x : x...x
1111 1111 0xxx xxxx :
■
■
multicast identifier: The first eight high-order bits, set to ff, identify the
address as multicast.
multicast flags: Bits 9-12 are multicast flags that provide additional
information about the multicast address, as follows:
Bit ID
9
Options
Use
0
0
1
0
reserved
10 (R)
multicast address without PIM-SM rendezvous point
multicast address with PIM-SM rendezvous point
11 (P)
12 (T)
multicast address without prefix information from the
originating network
1
0
1
multicast address with prefix information from the originating
network
multicast address is permanent (well-known, and not
restricted by scope value)
multicast address is temporary (and used only within an
identified scope)
3-22
IPv6 Addressing
Multicast Application to IPv6 Addressing
■
multicast scope: Bits 13-16 set boundaries on multicast traffic distribu-
tion, such as the interface defined by the link-local unicast address of an
area, or the network boundaries of an organization. Because IPv6 uses
multicast technology in place of the broadcast technology used in IPv4,
the multicast scope field also controls the boundaries for broadcast-type
traffic sent in multicast packets.
Bit
0
Use
reserved
1
interface-local (loopback)
2
link-local (same topology as the corresponding link-local unicast scope)
3
reserved
4
admin-local (smallest administratively configured scope)
5
site-local (single site)
6
unassigned
7
unassigned
8
organization-local (multiple sites within the same organization)
9
unassigned
unassigned
unassigned
unassigned
unassigned
global
A
B
C
D
E
F
reserved
For example, the following prefix indicates multicast traffic with a tempo-
rary multicast address and a link-local scope:
ff12 or (binary) 1111 1111 0001 0010
■
group identifier: This field includes the last 112 bits of the multicast
address and contains the actual multicast group identity. (Refer to RFCs
3306, 4291, and 2375.)
Solicited-Node Multicast Address Format
The solicited-node multicast address the switch generates for a configured
unicast or anycast address is composed of a unique, 104-bit multicast prefix
(ff02:0:0:0:0:1:ff) and the last 24 bits of the subject address. For example, if a
VLAN interface is configured with a link-local address of
3-23
IPv6 Addressing
Loopback Address
fe90::215:60ff:fe7a:adc0
then the corresponding solicited-node multicast address is
ff02:0:0:0:0:1:ff7a:adc0
For related information, refer to:
■
■
■
RFC 2375: IPv6 Multicast Address Assignments
RFC 3306: Unicast-Prefix-based IPv6 Multicast Addresses
RFC 3956: Embedding the Rendezvous Point (RP) Address in an IPv6
Multicast Address
■
RFC 3177: IAB/IESG Recommendations on IPv6 Address Allocations to
Sites
■
■
■
■
■
RFC 4007: IPv6 Scoped Address Architecture
RFC 4291: IP Version 6 Addressing Architecture
“Internet Protocol Version 6 Multicast Addresses” (at www.iana.org)
RFC 2710: Multicast Listener Discovery (MLD) for IPv6
RFC 3810: Multicast Listener Discovery Version 2 (MLDv2) for IPv6
(Updates RFC 2710.)
Loopback Address
The IPv6 loopback address is a link-local unicast address that enables a device
to send traffic to itself for self-testing purposes. The loopback address does
not have a physical interface assignment. If an IPv6 packet destined for the
loopback address is received on a switch interface, it must be dropped. The
IPv6 loopback address is never used as the source IPv6 address for any packet
that is sent out of a device, and the switch drops any traffic it receives with a
loopback address destination. An example use case is:
ProCurve# ping6 ::1
0000:0000:0000:0000:0000:0000:0000:0001 is alive, time = 1 ms
3-24
IPv6 Addressing
The Unspecified Address
The Unspecified Address
The “unspecified” address is defined as 0.0.0.0.0.0.0.0 (::/128, or just ::). It can
be used, for example, as a temporary source address in multicast traffic sent
by an interface that has not yet acquired its own address. The unspecified
address cannot be statically configured on the switch, or used as a destination
address.
IPv6 Address Deprecation
Preferred and Valid Address Lifetimes
Autoconfigured IPv6 global unicast addresses acquire their valid and
preferred lifetime assignments from router advertisements. A valid lifetime is
the time period during which an address is allowed to remain available and
usable on an interface. A preferred lifetime is the length of time an address is
intended for full use on an interface, and must be less than or equal to the
address's valid lifetime.
End of
Preferred
Lifetime
Address
“Deprecated”
Address “Preferred”
Valid Lifetime
Address
Removed
Address
Acquired
Figure 3-1. Valid and Preferred Lifetimes
When the preferred lifetime expires, the address becomes deprecated,
meaning thatthe addressshould no longerbe used as a source address (except
for existing exchanges that began before the timeout occurred), but can still
be used as a destination. When the timeout arrives for the valid lifetime, the
address becomes unusable.
3-25
IPv6 Addressing
IPv6 Address Deprecation
N o t e s
Preferred and valid lifetimes on a VLAN interface are determined by the router
advertisements received on the interface. These values are not affected by the
lease time assigned to an address by a DHCPv6 server. That is, lease expiration
on a DHCPv6-assigned address terminates use of the address, regardless of
the status of the RA-assigned lifetime, and router-assigned lifetime expiration
of a leased address terminates the switch’s use of the address. (The router-
assigned lifetime can be extended by receipt of a new router advertisement.)
Statically configured IPv6 addresses are regarded as permanent addresses,
and do not expire.
Related Information
■
RFC 2462: “IPv6 Stateless Address Autoconfiguration”
RFC 4291: “IP Version 6 Addressing Architecture”
■
3-26
4
IPv6 Addressing Configuration
Contents
Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-3
General Configuration Steps . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-4
Configuring IPv6 Addressing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-5
Enabling IPv6 with an Automatically Configured
Link-Local Address . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-6
Enabling Automatic Configuration of a Global Unicast
Address and a Default Router Identity on a VLAN . . . . . . . . . . . . . . . 4-7
Operating Notes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-8
Enabling DHCPv6 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-9
Operating Notes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-10
Configuring a Static IPv6 Address on a VLAN . . . . . . . . . . . . . . . . . . 4-11
Statically Configuring a Link-Local Unicast Address . . . . . . . . . . . . 4-12
Statically Configuring A Global Unicast Address . . . . . . . . . . . . . . . . 4-13
Operating Notes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-14
Statically Configuring An Anycast Address . . . . . . . . . . . . . . . . . . . . . 4-14
Duplicate Address Detection (DAD) for Statically
Configured Addresses . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-16
Disabling IPv6 on a VLAN . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-16
Neighbor Discovery (ND) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-17
Duplicate Address Detection (DAD) . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-18
DAD Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-18
Configuring DAD . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-19
Operating Notes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-20
View the Current IPv6 Addressing Configuration . . . . . . . . . . . . . . 4-21
Router Access and Default Router Selection . . . . . . . . . . . . . . . . . . . 4-27
Router Advertisements . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-27
4-1
IPv6 Addressing Configuration
Contents
Router Solicitations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-27
Default IPv6 Router . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-28
Router Redirection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-28
View IPv6 Gateway, Route, and Router Neighbors . . . . . . . . . . . . . 4-29
Viewing Gateway and IPv6 Route Information . . . . . . . . . . . . . . . . . . 4-29
Viewing IPv6 Router Information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-30
Address Lifetimes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-32
Preferred Lifetime . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-32
Valid Lifetime . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-32
Sources of IPv6 Address Lifetimes . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-32
4-2
IPv6 Addressing Configuration
Introduction
Introduction
Feature
Default
CLI
Enable IPv6 with a Link-Local
Address
disabled
4-6
Configure Global Unicast
Autoconfig
disabled
4-7
Configure DHCPv6 Addressing
disabled
None
4-9
Configure a Static Link-Local
Address
4-12
Configure a Static Global Unicast
Address
None
4-13
Configure an Anycast Address
Change DAD Attempts
None
3
4-14
4-18
4-21
View Current IPv6 Addressing
n/a
In the default configuration, IPv6 operation is disabled on the switch. This
section describes the general steps and individual commands for enabling
IPv6 operation.
This chapter provides the following:
■
general steps for IPv6 configuration
■
IPv6 command syntax descriptions, including show commands
ICMP, ND (neighbor discovery), and the (optional) authorized-managers
feature, which are configured at the global configuration level. (ICMP and ND
either be left in their default settings or reconfigured, as needed.) For more
informaton on ICMP, refer to “ICMP Rate-Limiting” on page 8-2. For more on
ND, refer to “Neighbor Discovery (ND) in IPv6” on page 2-9.
For a quick reference to all IPv6 commands available on the switch, refer to
the “IPv6 Command Index” on page xi at the front of this guide.
N o t e
Beginning with software release K.13.01, the switch is capable of operating in
dual-stack mode, where IPv4 and IPv6 run concurrently on a given VLAN.
4-3
IPv6 Addressing Configuration
General Configuration Steps
General Configuration Steps
The IPv6 configuration on switches running software release K.13.01 includes
global and per-VLAN settings. This section provides an overview of the general
configuration steps for enabling IPv6 on a given VLAN and can be enabled by
any one of several commands. The following steps provide a suggested
progression for getting started.
N o t e
The ICMP and Neighbor Discovery (ND) parameters are set to default values
at the global configuration level are satisfactory for many applications and
generally do not need adjustment when you are first configuring IPv6 on the
switch.
In the default configuration, IPv6 is disabled on all VLANs.
1. If IPv6 DHCP service is available, enable IPv6 DHCP on the VLAN. If IPv6
is not already enabled on the VLAN, enabling DHCPv6 also enables IPv6
and automatically configures a link-local address using the EUI-64 format.
N o t e
If IPv6 is not already enabled on the VLAN, enabling DHCPv6 causes the
switch to automatically generate a link-local address. DHCPv6 does not assign
a link-local address.
A DHCPv6 server can provide other services, such as the addresses of
time servers. For this reason you may want to enable DHCP even if you
are using another method to configure IPv6 addressing on the VLAN.
2. If IPv6 DHCP service is not enabled on the VLAN, then do either of the
following:
•
Enable IPv6 on the VLAN. This automatically configures a link-local
address with an EUI- 64 interface identifier.
•
Statically configure a unicast IPv6 address on the VLAN. This enables
IPv6 on the VLAN and, if you configure anything other than a link-
local address, the link-local address will be automatically configured
as well, with an EUI-64 interface identifier.
3. If an IPv6 router is connected on the VLAN, then enable IPv6 address
autoconfiguration to automatically configure global unicast addresses
with prefixes included in advertisements received from the router. The
device identifier used in addresses configured by this method will be the
same as the device identifier in the current link-local address.
4-4
IPv6 Addressing Configuration
Configuring IPv6 Addressing
4. If needed, statically configure IPv6 unicast addressing on the VLAN
interface as needed. This can include any of the following:
•
•
statically replacing the automatically generated link-local address
statically adding global unicast, unique local unicast, and/or anycast
addresses
Configuring IPv6 Addressing
enables IPv6 and creates a link-local address. Thus, while any one of these
address is present:
ipv6 enable (page 4-6)
ipv6 address autoconfig (page 4-7)
ipv6 address dhcp full [rapid-commit] (page 4-9)
ipv6 address fe80:0:0:0:< device-identifier > link-local (page 4-12)
N o t e
Addresses created by any of these methods remain tentative until verified as
unique by Duplicate Address Detection. (Refer to “Duplicate Address Detec-
tion (DAD)” on page 4-18.)
4-5
IPv6 Addressing Configuration
Enabling IPv6 with an Automatically Configured Link-Local Address
Enabling IPv6 with an Automatically
Configured Link-Local Address
This command enables automatical configuration of a link-local address .
Syntax: [no] ipv6 enable
If IPv6 has not already been enabled on a VLAN by another
IPv6commandoptiondescribedinthischapter, thiscommand
enables IPv6 on the VLAN and automatically configures the
VLAN's link-local unicast address with a 64-bit EUI-64 inter-
face identifier generated from the VLAN MAC address. (Refer
to “Extended Unique Identifier (EUI)” on page 3-14.).
Note: Only one link-local IPv6 address is allowed on the
VLAN interface. Subsequent static or DHCP configuration
of another link-local address overwrites the existing link-
local address.
A link-local address always uses the prefix fe80:0:0:0.
With IPv6 enabled, the VLAN uses received router advertise-
ments to designate the default IPv6 router. (Refer to “Default
IPv6 Router” on page 4-28.)
After verification of uniqueness by DAD, a link-local IPv6
address assigned automatically is set to the preferred status,
with a “permanent” lifetime. (Refer to “IPv6 Address Depreca-
tion” on page 3-25.)
Default: Disabled
The no form of the command disables IPv6 on the VLAN if no
other IPv6-enabling command is configured on the VLAN.
(Refer to “Disabling IPv6 on a VLAN” on page 4-16.)
To view the current IPv6 Enable setting and any statically configured IPv6
addresses per-VLAN, use show run.
To view all currently configured IPv6 unicast addresses, use the following:
■
show ipv6 (Lists IPv6 addresses for all VLANs configured on the switch.)
show ipv6 vlan < vid > (Lists IPv6 addresses configured on the VLAN.)
■
For more information, refer to “View the Current IPv6 Addressing Configura-
tion” on page 4-21.
4-6
IPv6 Addressing Configuration
Enabling Automatic Configuration of a Global Unicast Address and a Default Router Identity on a VLAN
Enabling Automatic Configuration of a
Global Unicast Address and a Default
Router Identity on a VLAN
Enabling autoconfig or rebooting the switch with autoconfig enabled on a
VLAN causes the switch to configure IPv6 addressing on the VLAN using
router advertisements and an EUI-64 interface identifier (page 3-14).
Syntax: [no] ipv6 address autoconfig
Implements unicast address autoconfiguration as follows:
■
If IPv6 is not already enabled on the VLAN, this command
enables IPv6 and generates a link-local (EUI- 64) address.
■
■
Generates router solicitations (RS) on the VLAN.
If a router advertisement (RA) is received on the VLAN,
the switch uses the route prefix in the RA to configure a
global unicast address. The device identifier for this
the current link-local address at the time the RA is
received. (This can be either a statically configured or the
(automatic) EUI-64 device identifier, depending on how
the link-local address was configured.) For information
on EUI- 64, refer to “Extended Unique Identifier (EUI)”
on page 3-14.) If an RA is not received on the VLAN after
autoconfig is enabled, a link-local address will be present,
but no global unicast addresses will be autoconfigured.
Notes: If a link-local address is already configured on the
VLAN, a later, autoconfigured global unicast address uses
the same device identifier as the link-local address.
Autoconfigured and DHCPv6-assigned global unicast
addresses with the same prefix are mutually exclusive on
a VLAN. On a given switch, if both options are configured
on the same VLAN, then only the first to acquire a global
unicast address will be used.
— Continued on the next page. —
4-7
IPv6 Addressing Configuration
Enabling Automatic Configuration of a Global Unicast Address and a Default Router Identity on a VLAN
— Continued from the previous page. —
After verification of uniqueness by DAD, an IPv6 address
assigned to a VLAN by autoconfiguration is set to the preferred
and valid lifetimes specified by the RA used to generate the
address, and is configured as a preferred address. (Refer to
“IPv6 Address Deprecation” on page 3-25.)
The no form of the command produces different results,
depending on how IPv6 is configured on the VLAN:
If IPv6 was enabled only by the autoconfig command, then
deleting this command disables IPv6 on the VLAN. (Refer to
“Disabling IPv6 on a VLAN” on page 4-16.)
To view all currently configured IPv6 unicast addresses, use the following:
■
show ipv6 (Lists IPv6 addresses for all VLANs configured on the switch.)
show ipv6 vlan < vid > (Lists IPv6 addresses configured onthe VLAN.)
■
For more information, refer to “View the Current IPv6 Addressing Configura-
Operating Notes
With IPv6 enabled, the VLAN uses received router advertisements todesignate
thedefaultIPv6router. (Referto“RouterAccessandDefaultRouterSelection”
on page 4-27.)
4-8
IPv6 Addressing Configuration
Enabling DHCPv6
Enabling DHCPv6
Enabling the DHCPv6 option on a VLAN allows the switch to obtain a global
unicast address and an NTP (network time protocol) server assignment for a
Timep server. (If a DHCPv6 server is not needed to provide a global unicast
address to a switch interface, the server can still be configured to provide the
NTP server assignment. This is sometimes referred to as “stateless DHCPv6”.)
Syntax: [no] ipv6 address dhcp full [rapid-commit]
This option configures DHCPv6 on a VLAN, which initiates
transmission of DHCPv6 requests for service. If IPv6 is not
already enabled on the VLAN by the ipv6 enable command, this
option also enables IPv6 and causes the switch to autocon-
figure a link-local unicast address with an EUI-64 interface
identifier.
Notes: A DHCPv6 server does not assign link-local
addresses, and enabling DHCPv6 on a VLAN does not
affect a pre-existing link-local address configured on the
VLAN.
A DHCPv6-assigned address can be configured on a VLAN
when the following is true:
•
The assigned address is not on the same subnet as a
previously configured autoconfig address.
•
The maximum IPv6 address limit on the VLAN or the
switch has not been reached.
If a DHCPv6 server responds with an IPv6 address assign-
ment, this address is assigned to the VLAN. (The DHCPv6-
assigned address will be dropped if it has the same subnet as
another address already assigned to the VLAN by an earlier
autoconfig command.)
— Continued on the next page. —
4-9
IPv6 Addressing Configuration
Enabling DHCPv6
— Continued from the previous page. —
After verification of uniqueness by DAD, an IPv6 address
assigned to the VLAN by an DHCPv6 server is set to the
preferred and valid lifetimes specified in a router advertise-
ment received on the VLAN for the prefix used in the assigned
address, and is configured as a preferred address. (Refer to
the section titled “Address Lifetimes” on page 4-32.)
[rapid-commit]: Expedites DHCP configuration by using a two-
message exchange with the server (solicit-reply) instead of the
default four-message exchange (solicit-advertise- request-
reply).
Default: Disabled
The no form of the command removes the DHCPv6 option from
the configuration and, if no other IPv6-enabling command is
configured on the VLAN, disables IPv6 on the VLAN. (Refer to
“Disabling IPv6 on a VLAN” on page 4-16.)
To view all currently configured IPv6 unicast addresses, use the following:
■
show ipv6 (Lists IPv6 addresses for all VLANs configured on the switch.)
show ipv6 vlan < vid > (Lists IPv6 addresses configured on the VLAN.)
■
For more information, refer to “View the Current IPv6 Addressing Configura-
tion” on page 4-21.
Operating Notes
■
■
■
■
If multiple DHCPv6 servers are available, the switch selects a server based
on the preference value sent in DHCPv6 messages from the servers.
The switch supports both DHCPv4 and DHCPv6 client operation on the
DHCPv6 authentication and stateless DHCPv6 are not supported in soft-
ware release K.13.01.
With IPv6 enabled, the switch determines the default IPv6 router for the
VLAN from the router advertisements it receives. (Refer to “Default IPv6
Router” on page 4-28.)
4-10
IPv6 Addressing Configuration
Configuring a Static IPv6 Address on a VLAN
■
DHCPv6 and statically configured global unicast or anycast addresses are
mutually exclusive on a given VLAN. That is, configuring DHCPv6 on a
VLAN erases any static global unicast or anycast addresses previously
configured on that VLAN, and the reverse. (A statically configured link-
local address will not be affected by configuring DHCPv6 on the VLAN.)
■
For the same subnet on the switch, a DHCPv6 global unicast address
assignment takes precedence over an autoconfigured address assign-
ment, regardless of which address type was the first to be configured. If
DHCPv6 is subsequently removed from the configuration, then an auto-
configured address assignment will replace it after the next router adver-
tisement is received on the VLAN. DHCPv6 and autoconfigured addresses
co-exist on the same VLAN if they belong to different subnets.
For related information refer to:
■
RFC 3315: “Dynamic Host Configuration Protocol for IPv6 (DHCPv6)”
■
RFC 3633: “IPv6 Prefix Options for Dynamic Host Configuration Protocol
(DHCP) version 6”
■
RFC 3736: “Stateless Dynamic Host Configuration Protocol (DHCP)
Service for IPv6”
Configuring a Static IPv6 Address on a
VLAN
This option enables configuring of unique, static unicast and anycast IPv6
addresses for global and link-local applications, including:
■
■
■
link-local unicast (including EUI and non-EUI device identifiers)
global unicast (and unique local unicast)
anycast
4-11
IPv6 Addressing Configuration
Configuring a Static IPv6 Address on a VLAN
Statically Configuring a Link-Local Unicast Address
Syntax: [no] ipv6 address fe80::< device-identifier > link-local
■
If IPv6 is not already enabled on the VLAN, this command
enables IPv6 and configures a static link-local address.
■
IfIPv6isalreadyenabledontheVLAN, thenthiscommand
overwrites the current, link- local address with the speci-
fied static address. (One link-local address is allowed per
VLAN interface.)
< device-identifier >: The low-order 64 bits, in 16-bit blocks,
comprise this value in a link-local address:
xxxx xxxx : xxxx xxxx : xxxx xxxx : xxxx xxxx
Where a static link-local address is already configured, a new,
autoconfigured global unicast addresses assignment uses the
same device identifier as the link-local address.
Notes: An existing link-local address is replaced, and is not
deprecated, when a static replacement is configured.
The prefix for a statically configured link-local address is
fe80:0:0:0.
After verification of uniqueness by DAD, a statically config-
ured link-local address status is set to preferred, with a perma-
nent lifetime. (Refer to “IPv6 Address Deprecation” on page 3-
25.)
Forlink-local addressing, theno formofthestaticIPv6address
command produces different results, depending on how IPv6
is configured on the VLAN:
■
If IPv6 was enabled only by a statically configured link-
local address, then deleting the link-local address disables
IPv6 on the VLAN.
■
If other IPv6-enabling commands have been configured on
the VLAN, then deleting the statically configured link-local
address causes the switch to replace it with the default
(EUI-64) link-local address for the VLAN, and IPv6
remainsenabled. (FormoreontheEUI-64addressformat,
refer to “Extended Unique Identifier (EUI)” on page 3-14.)
Refer also to “Disabling IPv6 on a VLAN” on page 4-16.
4-12
IPv6 Addressing Configuration
Configuring a Static IPv6 Address on a VLAN
Statically Configuring A Global Unicast Address
[no] ipv6 address < network-prefix><device-id >/< prefix-length >
[no] ipv6 address < network-prefix>::/< prefix-length > eui-64
Syntax:.
If IPv6 is not already enabled on a VLAN, either of these
command options do the following:
■
■
■
enable IPv6 on the VLAN
configure a link-local address using the EUI-64 format
statically configure a global unicast address
If IPv6 is already enabled on the VLAN, then the above
commands statically configure a global unicast address, but
have no effect on the current link-local address.
< network-prefix >: This includes the global routing prefix and
the subnet ID for the address. For more on this topic, refer to
“Prefixes in Routable IPv6 Addresses” on page 3-18.
< prefix-length >: Specifies the number of bits in the network
prefix. If you are using the eui-64 option, this value must be 64.
eui-64: Specifies using the Extended Unique Identifier format
Refer to “Extended Unique Identifier (EUI)” on page 3-14.
After verification of uniqueness by DAD, the lifetime of a
statically configured IPv6 address assigned to a VLAN is set
to permanent, and is configured as a preferred address. (Refer
to “IPv6 Address Deprecation” on page 3-25.)
The no form of the command erases the specified address and,
ifnootherIPv6-enablingcommandisconfiguredontheVLAN,
disables IPv6 on the VLAN. (Refer to “Disabling IPv6 on a
VLAN” on page 4-16.)
To view all currently configured IPv6 unicast addresses, use the following:
■
show ipv6 (Lists IPv6 addresses for all VLANs configured on the switch.)
show ipv6 vlan < vid > (Lists IPv6 addresses configured on VLAN < vid >.)
■
For more information, refer to “View the Current IPv6 Addressing Configura-
tion” on page 4-21.
4-13
IPv6 Addressing Configuration
Configuring a Static IPv6 Address on a VLAN
Operating Notes
■
■
■
■
With IPv6 enabled, the switch determines the default IPv6 router for the
VLANfromtherouteradvertisementsitreceives. (Referto“RouterAccess
and Default Router Selection” on page 4-27.)
If DHCPv6 is configured on a VLAN, then configuring a static global
unicast address on the VLAN removes DHCPv6 from the VLAN's config-
uration and deletes the DHCPv6-assigned global unicast address.
Note that for a statically configured global unicast address to be routable,
a gateway router must be transmitting router advertisements on the
VLAN.
If an autoconfigured global unicast address already exists for the same
subnet as a new, statically configured global unicast address, the statically
configured address is denied. In the reverse case, you can add an auto-
config command to the VLAN configuration, but it will not be imple-
mented unless the static address is removed from the configuration.
Statically Configuring An Anycast Address
Anycast addresses on the switch appear the same as global unicast addresses.
To configure an anycast address on a VLAN, append the anycast keyword to
thesamecommandthatisusedtostaticallyconfigureaglobalunicastaddress.
(Link-Local unicast addresses cannot be configured as anycast addresses on
the switch.)
Anycast addresses are allocated from the unicast address space, and cannot
be distinguished from other IPv6 global unicast addresses configured on the
switch, except by viewing the address configurations listed per-VLAN in the
show run output. For more information on using anycast addresses, refer to
“Anycast Addresses” on page 3-20.
4-14
IPv6 Addressing Configuration
Configuring a Static IPv6 Address on a VLAN
[no] ipv6 address < network-prefix >< device-identifier >/< prefix-length >
anycast
Syntax:.
IfIPv6isnotalreadyenabledonaVLAN, thiscommand option
does the following:
■
■
■
enables IPv6 on the VLAN
configures a link-local address using the EUI-64 format
statically configures an anycast address
If IPv6 is already enabled on the VLAN, then the above
commandss statically configure an anycast address, but has
no effect on the current link-local address.
anycast: Identifies the specified address as an anycast address.
This allows the address to be duplicated (as an anycast
address) on other devices on the same network.
Default: None.
The no form of the command erases the specified anycast
address and, if no other IPv6- enabling command is config-
ured on the VLAN, disables IPv6 on the VLAN. (Refer to
“Disabling IPv6 on a VLAN” on page 4-16.)
To verify the identity of anycast addresses configured for VLANs to which the
To view all currently configured IPv6 unicast addresses, use the following:
■
show ipv6 (Lists IPv6 addresses for all VLANs configured on the switch.)
show ipv6 vlan < vid > (Lists IPv6 addresses configured on VLAN < vid >.)
■
For more information, refer to “View the Current IPv6 Addressing Configura-
tion” on page 4-21.
4-15
IPv6 Addressing Configuration
Disabling IPv6 on a VLAN
Duplicate Address Detection (DAD) for Statically
Configured Addresses
Statically configured IPv6 addresses are designated as permanent. If DAD
ured and reachable address on another device belonging to the VLAN, then
the more recent, duplicate address is designated as duplicate. For more on this
topic, refer to:
■
“Duplicate Address Detection (DAD)” on page 4-18.
■
“View the Current IPv6 Addressing Configuration” on page 4-21
N o t e
Multiple, duplicate addresses configured as Anycast on different devices are
special cases of unicast addresses, and are not identified as duplicates by
DAD. Refer to “Anycast Addresses” on page 3-20.
Disabling IPv6 on a VLAN
While one IPv6-enabling command is configured on a VLAN, IPv6 remains
enabledonthatVLAN. Inthiscase, removingtheonlyIPv6-enabling command
from the configuration disables IPv6 operation on the VLAN. Thatis, to disable
IPv6 on a VLAN, all of the following commands must be removed from the
VLAN's configuration:
ipv6 enable
ipv6 address dhcp full [rapid-commit]
ipv6 address autoconfig
ipv6 address fe80::< device-identifier > link-local
ipv6 address < prefix > : < device-identifier >
If any of the above remain enabled, then IPv6 remains enabled on the VLAN
and, at a minimum, a link-local unicast address will be present.
4-16
IPv6 Addressing Configuration
Neighbor Discovery (ND)
Neighbor Discovery (ND)
Neighbor Discovery (ND) is the IPv6 equivalent of the IPv4 ARP for layer 2
address resolution, and uses IPv6 ICMP messages to do the following:
■
Determine the link-layer address of neighbors on the same VLAN inter-
face.
■
■
Verify that a neighbor is reachable.
Track neighbor (local) routers.
Neighbor Discovery enables functions such as the following:
■
■
■
router and neighbor solicitation and discovery
detecting address changes for devices on a VLAN
identifying a replacement for a router or router path that has become
unavailable
■
■
■
■
■
■
■
duplicate address detection (DAD)
router advertisement processing
neighbor reachability
autoconfiguration of unicast addresses
resolution of destination addresses
changes to link-layer addresses
anycast address operation
An instance of Neighbor Discovery is triggered on a device when a new
(tentative) or changed IPv6 address is detected. (This includes stateless,
stateful, and static address configuration.) ND operates in a per-VLAN scope;
that is, within the VLAN on which the the device running the ND instance is a
member. Neighbor discovery actually occurs when there is communication
between devices on a VLAN. That is, a device needing to determine the link-
layer address of another device on the VLAN initiates a (multicast) neighbor
solicitation message (containing a solicited-node multicast address that corre-
sponds to the IPv6 address of the destination device) on the VLAN. When the
destination device receives the neighbor solicitation, it responds with a
neighbor advertisement message identifying its link-layer address. When the
initiating device receives this advertisement, the two devices are ready to
exchange traffic on the VLAN interface. Also, when an IPv6 interface becomes
operational, it transmits a router solicitation on the interface and listens for a
router advertisement.
4-17
IPv6 Addressing Configuration
Duplicate Address Detection (DAD)
N o t e :
Neighbor and router solicitations must originate on the same VLAN as the
receiving device. To support this operation, IPv6 is designed to discard any
incoming neighbor or router solicitation that does not have a value of 255 in
the IP Hop Limit field. For a complete list of requirements, refer to RFC 246.
each other's IPv6 and corresponding MAC addresses in their respective
neighbor caches. These entries are maintained for a period of time after
communication ceases, and then dropped.
To view or clear the content of the neighbor cache, refer to “Viewing and
Clearing the IPv6 Neighbors Cache” on page 5-2.
For related information, refer to:
■
RFC 2461: “Neighbor Discovery for IP Version 6 (IPv6)”
Duplicate Address Detection (DAD)
Duplicate Address Detection verifies that a configured unicast IPv6 address
is unique before it is assigned to a VLAN interface on the switch. DAD is
enabled in the default IPv6 configuration, and can be reconfigured, disabled,
or re-enabled at the globalconfigcommandlevel. DAD canbe useful inhelping
to troubleshoot erroneous replies to DAD requests, or where the neighbor
cachecontainsalargenumberofinvalid entriesduetoanunauthorizedstation
sending false replies to the switch's neighbor discovery queries. If DAD
verifies that a unicast IPv6 address is a duplicate, the address is not used. If
the link-local address of the VLAN interface is found to be a duplicate of an
address for another device on the interface, then the interface stops
processing IPv6 traffic.
DAD Operation
On a given VLAN interface, when a new unicast address is configured, the
switch runs DAD for this address by sending a neighbor solicitation to the All-
Nodes multicast address (ff02::1). This operation discovers other devices on
the VLAN and verifies whether the proposed unicast address assignment is
unique on the VLAN. (During this time, the address being checked for unique-
ness is held in a tentative state, and cannot be used to receive traffic other
than neighbor solicitations and neighbor advertisements.) A device that
receives the neighbor solicitation responds with a Neighbor Advertisement
4-18
IPv6 Addressing Configuration
Duplicate Address Detection (DAD)
that includes its link-local address. If the newly configured address is from a
static or DHCPv6 source and is found to be a duplicate, it is labelled as
duplicate in the “Address Status” field of the show ipv6 command, and is not
used. If an autoconfigured address is found to be a duplicate, it is dropped and
the following message appears in the Event Log:
W < date > < time > 00019 ip: ip address< IPv6-address >
removed from vlan id< vid >
DAD does not perform periodic checks of existing addresses. However, when
a VLAN comes up with IPv6 unicast addresses configured (as can occur during
a reboot) the switch runs DAD for each address on the interface by sending
neighbor solicitations to the All-Nodes multicast address as described above.
If an address is configured while DAD is disabled, the address is assumed to
be unique and is assigned to the interface. If you want to verify the uniqueness
of an address configured while DAD was disabled, re-enable DAD and then
either delete and reconfigure the address, or reboot the switch.
Configuring DAD
Syntax: ipv6 nd dad-attempts < 0 - 600 >
This command is executed at the global config level, and
configures the number of neighbor solicitations to send when
performing duplicate address detection for a unicast address
configured on a VLAN interface.
< 0 - 600 >: The number of consecutive neighbor solicitation
messages sent for DAD inquiries on an interface. Setting this
value to 0 disables DAD on the interface. Disabling DAD
bypasses checks for uniqueness on newly configured
addresses. If a reboot is performed while DAD is disabled, the
duplicate address check is not performed on any IPv6
addresses configured on the switch.
Default: 3 (enabled); Range: 0 - 600 (0 = disabled)
The no form of the command restores the default setting (3).
4-19
IPv6 Addressing Configuration
Duplicate Address Detection (DAD)
Operating Notes
■
A verified link-local unicastaddressmustexist on a VLAN interfacebefore
the switch can run DAD on other addresses associated with the interface.
■
If a previously configured unicast address is changed, a neighbor adver-
tisement (an all-nodes multicast message--ff02::1) is sent to notify other
devices on the VLAN and to perform duplicate address detection.
■
IPv6 addresses on a VLAN interface are assigned to multicast address
groups identified with well- known prefixes. For more on this topic, refer
to “Multicast Application to IPv6 Addressing” on page 3-21.
■
■
■
DAD is performed on all stateful, stateless, and statically configured
unicast addresses, but not on Anycast addresses.
Neighbor solicitations for DAD do not cause the neighbor cache of
neighboring switches to be updated.
If a previously configured unicast address is changed, a neighbor adver-
tisementis sent on the VLAN to notify other devices, and also for duplicate
address detection.
■
If DAD is disabled when an address is configured, the address is assumed
to be unique and is assigned to the interface.
4-20
IPv6 Addressing Configuration
View the Current IPv6 Addressing Configuration
View the Current IPv6 Addressing
Configuration
Use these commands to view the current status of the IPv6 configuration on
the switch.
Syntax: show ipv6
addressing on the switch.
IPv6 Routing: For software release K.13.01, this setting is
always Disabled. This is a global setting, and is not configured
per-VLAN. (Refer to “Router Access and Default Router Selec-
tion” on page 4-27.)
Default Gateway: Lists the IPv4 default gateway, if any, config-
gateway address, and is not configured per-VLAN.
ND DAD: Indicates whether DAD is enabled (the default) or
disabled. Using ipv6 nd dad-attempts 0 disables neighbor
discovery. (Refer to “Duplicate Address Detection (DAD)” on
page 4-18.)
DAD Attempts: Indicates the number of neighbor solicitations
the switch transmits per-address for duplicate (IPv6) address
detection. Implemented when a new address is configured or
when an interface with configured addresses comes up (such
as after a reboot). The default setting is 3, and the range is 0
- 600. A setting of “0” disables duplicate address detection.
(Refer to “Duplicate Address Detection (DAD)” on page 4-18.)
VLAN Name: Lists the name of a VLAN statically configured on
the switch.
IPv6 Status: For the indicated VLAN, indicates whether IPv6 is
disabled (the default) or enabled. (Refer to “Configuring IPv6
Addressing” on page 4-5.)
4-21
IPv6 Addressing Configuration
View the Current IPv6 Addressing Configuration
Address Origin:
■
Autoconfig: The address was configured using stateless
address autoconfiguration (SLAAC). In this case, the
device identifier for global unicast addresses copied from
the current link-local unicast address.
■
DHCP: The address was assigned by a DHCPv6 server. Note
that addresses having a DHCP origin are listed with a 128-
bit prefix length.
■
■
Manua:l: The address was statically configred on the VLAN.
IPv6 Address/Prefix Length: Lists each IPv6 address and
prefix length configured on the indicated VLAN.
Address Status:
■
Tentative: DAD has not yet confirmed the address as
unique, and is not usable for sending and receiving traffic.
■
Preferred: The address has been confirmed as unique by
DAD, and usable for sending and receiving traffic. The
Expiry time shown for this address by the show ipv6 vlan
< vid > command output is the preferred lifetime assigned
to the address. (Refer to "Address Lifetimes" on page xxx.)
■
■
Deprecated: The preferred lifetime for the address has been
exceeded, but there is time remaining in the valid lifetime.
Duplicate: Indicates a statically configured IPv6 address
that is a duplicate of another IPv6 address that already
exists on another device belonging to the same VLAN
interface. A duplicate address is not used.
For example, figure 4-1 shows the output on a switch having IPv6 enabled on
one VLAN.
4-22
IPv6 Addressing Configuration
View the Current IPv6 Addressing Configuration
ProCurve(config)# show ipv6
Internet (IPv6) Service
IPv6 Routing
: Disabled
Default Gateway : 10.0.9.80
ND DAD
DAD Attempts
: Enabled
: 3
Vlan Name
IPv6 Status
: DEFAULT_VLAN
: Disabled
Vlan Name
: VLAN10
IPv6 Status
: Enabled
Address
Origin
|
Address
Status
| IPv6 Address/Prefix Length
---------- + ------------------------------------------- -----------
autoconfig | 2620:0:a03:e102::127/64
preferred
preferred
preferred
dhcp
| 2620:0:a03:e102:212:79ff:fe88:a100/64
| fe80::127/64
manual
Figure 4-1. Example of Show IPv6 Command Output
Syntax: show ipv6 vlan < vid >
status for the specified VLAN, the IPv6 addresses (with prefix
lengths) configured on the specified VLAN, and the expiration
data (Expiry) for each address.:
■
■
■
IPv6 Routing: For software release K.13.01, this setting is
always Disabled. (Refer to “Router Access and Default
Router Selection” on page 4-27.).
Default Gateway: Lists the IPv4 default gateway, if any,
configured on the switch. This is a globally configured
router gateway address, and is not configured per-VLAN.
ND DAD: Shows whether Neighbor Discovery (ND) is
enabled. The default setting is Enabled. Using ipv6 nd dad-
attempts 0 disables neighbor discovery.
4-23
IPv6 Addressing Configuration
View the Current IPv6 Addressing Configuration
■
DAD Attempts: Indicates the number of neighbor solicita-
(IPv6) address detection. Implemented when a new
address is configured or when an interface with config-
ured addresses comes up (such as after a reboot). The
default setting is 3, and the range is 0 - 600. A setting of
■
■
VLAN Name: Lists the name of a VLAN statically configured
on the switch.
IPv6 Status: For the indicated VLAN, indicates whether
IPv6 is disabled (the default) or enabled. (Refer to “Config-
uring IPv6 Addressing” on page 4-5.)
■
■
IPv6 Address/Prefix Length: Lists each IPv6 address and
prefix length configured on the indicated VLAN.
Expiry: Lists the lifetime status of each IPv6 address listed
for a VLAN:
•
•
Permanent: The address will not time out and need
renewal or replacement.
date/time: The date and time that the address expires.
advertisement used to create the prefix for automati-
callyconfigured, globalunicastaddresses. TheAddress
Status field in the show ipv6 command output indicates
whether this date/time is for the “preferred” or “valid”
lifetime assigned to the corresponding address. (Refer
to “Preferred and Valid Address Lifetimes” on page 3-
25.)
4-24
IPv6 Addressing Configuration
View the Current IPv6 Addressing Configuration
ProCurve(config)# show ipv6 vlan 10
Internet (IPv6) Service
IPv6 Routing
: Disabled
Default Gateway : 10.0.9.80
ND DAD
DAD Attempts
: Enabled
: 3
Vlan Name
: VLAN10
IPv6 Status
: Enabled
IPv6 Address/Prefixlength
Expiry
------------------------------------------- -------------------------
2620:0:a03:e102::127/64
Wed Jan 23 14:16:17 2008
Sat Jan 5 05:02:22 2008
permanent
2620:0:a03:e102:212:79ff:fe88:a100/64
fe80::127/64
Figure 4-2. Example of Show IPv6 VLAN < vid > Output
Syntax: show run
In addition to the other elements of the current configuration,
this command lists the statically configured, global unicast
and anycast IPv6 addressing, and the current IPv6 configura-
tion per-VLAN. The listing may include one or more of the
following, depending on what other IPv6 options are config-
ured on the VLAN. Any stateless address autoconfiguration
(SLAAC) commands in the configuration are also listed in the
output, but the actual addresses resulting from these
commands are not included in the output.
■
■
■
■
■
■
ipv6 enable
ipv6 address fe80::< device-id > link-local
ipv6 address < prefix >:< device-id >/< prefix-length >
ipv6 address autoconfig
ipv6 address dhcp full [rapid-commit]
ipv6 < global-unicast-address >/< prefix > anycast
4-25
IPv6 Addressing Configuration
View the Current IPv6 Addressing Configuration
ProCurve(config)# show run
Running configuration:
.
.
.
vlan 10
name "VLAN10"
untagged A1-A12
ipv6 address fe80::127 link-local
Statically configured IPv6 addresses
appear in the show run output.
ipv6 address 2001:db8::127/64
ipv6 address 2001:db8::15:101/64 anycast
ipv6 address autoconfig
Commands for automatic IPv6 address
configuration appear in the show run
output, buttheaddressesresultingfrom
these commands do not appear in the
output.
.
.
.
Figure 4-3. Example of Show Run Output Listing the Current IPv6 Addressing Commands
4-26
IPv6 Addressing Configuration
Router Access and Default Router Selection
Router Access and Default Router
Selection
Routing traffic between destinations on different VLANs configured on the
switch or to a destination on an off-switch VLAN is done by placing the switch
on the same VLAN interface or subnet as an IPv6-capable router configured
to route traffic to other IPv6 interfaces or to tunnel IPv6 traffic across an IPv4
network.
Router Advertisements
An IPv6 router periodically transmits router advertisements (RAs) on the
VLANs to which it belongs to notify other devices of its presence. The switch
uses these advertisements for purposes such as:
■
learning the MAC and link-local addresses of IPv6 routers on the VLAN
(For devices other than routers, the switch must use neighbor discovery
to learn these addresses.)
■
■
building a list of default (reachable) routers, along with router lifetime
and prefix lifetime data
learning the prefixes and the valid and preferred lifetimes to use for
stateless (autoconfigured) global unicast addresses (This is required for
autoconfiguration of global unicast IPv6 addresses.)
■
■
learning the hop limit for traffic leaving the VLAN interface
learning the MTU (Maximum Transmission Unit) to apply to frames
intended to be routed
When an IPv6 interface becomes operational on the switch, a router solicita-
tion is automatically sent to trigger a router advertisement (RA) from any IPv6
routers reachable on the VLAN. (Router solicitations are sent to the All-
Routers multicast address; ff02::2. Refer to “Multicast Application to IPv6
Addressing” on page 3-21.) If an RA is not received within one second of
sending the initial router solicitation, the switch sends up to three additional
solicitations at intervals of four seconds. If an RA is received, the sending
router is added to the switch's default router list and the switch stops sending
router solicitations. If an RA is not received, then IPv6 traffic on that VLAN
cannot be routed, and the only usable unicast IPv6 address on the VLAN is the
link-local address.
4-27
IPv6 Addressing Configuration
Router Access and Default Router Selection
N o t e
If the switch does not receive a router advertisement after sending the router
solicitations, as described above, then no further router solicitations are sent
on that VLAN unless a new IPv6 setting is configured, IPv6 on the VLAN is
disabled, then re-enabled, or the VLAN itself is disconnected, then recon-
nected.
Default IPv6 Router
If IPv6 is enabled on a VLAN where there is at least one accessible IPv6 router,
the switch selects a default IPv6 router. (Refer to “Enabling Automatic Config-
uration of a Global Unicast Address and a Default Router Identity on a VLAN”
on page 4-7.)
■
If the switch receives router advertisements (RAs) from a single IPv6
router on the same VLAN or subnet, the switch configures a global unicast
address and selects the advertising router as the default IPv6 router.
■
If multiple IPv6 routers on a VLAN send RAs advertising the same
network, the switch configures one global unicast address and selects one
router as the default router, based on the router's relative reachability,
using factors such as router priority and route cost.
■
If multiple IPv6 routers on a VLAN send RAs advertising different subnets,
the switch configures a corresponding global unicast address for each RA
and selects one of the routers as the default IPv6 router, based on route
cost. When multiple RAs are received on a VLAN, the switch uses the
router priority and route cost information included in the RAs to identify
the default router for the VLAN.
Router Redirection
With multiple routers on a VLAN, if the default (first-hop) router for an IPv6-
enabled VLAN on the switch determines that there is a better first-hop router
for reaching a given, remote destination, the default router can redirect the
switch to use that other router as the default router. For further information
on routing IPv6 traffic, refer to the documentation provided for the IPv6
router.
For related information:
■
RFC 2461: “Neighbor Discovery for IP Version 6”
4-28
IPv6 Addressing Configuration
View IPv6 Gateway, Route, and Router Neighbors
View IPv6 Gateway, Route, and Router
Neighbors
Use these commands to view the switch's current routing table content and
connectivity to routers per VLAN. This includes information received inrouter
advertisements from IPv6 routers on VLANs enabled with IPv6 on the switch.
Viewing Gateway and IPv6 Route Information
Syntax: show ipv6 route [ ipv6-addr ] [connected
This command displays the routesin the switch's IPv6 routing
table.
ipv6-addr: Optional. Limits the output to show the gateway to
the specified IPv6 address.
connected: Optional. Limits the output to show only the gate-
ways to IPv6 addresses connected to VLAN interfaces config-
ured on the switch, including the loopback (::1/128) address.
Dest: The destination address for a detected route.
Gateway: The IPv6 address or VLAN interface used to reach the
destination. (Includes the loopback address.)
Type: Indicates route type (static, connected, RIP, or OSPF).
Distance: The route's administrative distance, used to deter-
mine the best path to the destination.
Metric: Indicates the route cost for the selected destination.
4-29
IPv6 Addressing Configuration
View IPv6 Gateway, Route, and Router Neighbors
ProCurve(config)# show ipv6 route
IPv6 Route Entries
“Unknown” Address
Dest : ::/0
Type : static
Gateway : fe80::213:c4ff:fedd:14b0%vlan10
Dist. : 40 Metric : 0
Dest : ::1/128
Gateway : lo0
Type : connected
Loopback Address
Dist. : 0
Dist. : 0
Dist. : 0
Dist. : 0
Metric : 1
Dest : 2001:db8:a03:e102::/64
Gateway : VLAN10
Type : connected
Metric : 1
Global Unicast Address
Configured on the Switch
Dest : fe80::%vlan10
Gateway : VLAN10
Type : connected
Metric : 1
Link-Local Address
Configured on the Switch
Dest : fe80::1%lo0
Gateway : lo0
Type : connected
Metric : 1
Link-Local Address Assigned
to the Loopback Address
Figure 4-4. Example of Show IPv6 Route Output
Viewing IPv6 Router Information
Syntax: show ipv6 routers [ vlan < vid > ]
This command lists the switch’s IPv6 router table entries for
all VLANs configured on the switch or for a single VLAN. This
output provides information about the IPv6 routers from
which routing advertisements (RAs) have been received on the
switch.
vlan < vid >: Optional. Specifies only the information on IPv6
routers on the indicated VLAN.
Router Address: The IPv6 address of the router interface.
Preference:Therelativepriorityofprefixassignmentsreceived
from the router when prefix assignments are also received on
the same switch VLAN interface from other IPv6 routers.
Interface: The VLAN interface on which the path to the router
exists.
4-30
IPv6 Addressing Configuration
View IPv6 Gateway, Route, and Router Neighbors
MTU: This is the Maximum Transmission Unit (in bytes)
allowed for frames on the path to the indicated router.
Hop Limit: The maximum number of router hops allowed.
Prefix Advertised: Lists the prefix and prefix size (number of
leftmost bits in an address) originating with the indicated
router.
Valid Lifetime: The total time the address is available, including
the preferred lifetime and the additional time (if any) allowed
“Address Lifetimes” on page 4-32.
Preferred Lifetime: The length of time during which the address
can be used freely as both a source and a destination address
for traffic exchanges with other devices. Refer to “Address
Lifetimes” on page 4-32.
On/Off Link: Indicates whether the entry source is on the same
VLAN as is indicated in the Interface field.
For example, figure 4-5 indicates that the switch is receiving router advertise-
ments from a single router that exists on VLAN 10.
ProCurve(config)# show ipv6 routers
IPv6 Router Table Entries
Router Address : fe80::213:c4ff:fedd:14b0
Preference
Interface
MTU
: Medium
: VLAN10
: 1500
: 64
Hop Limit
Valid
Lifetime(s) Lifetime(s) Link
------------------------------------------- ------------ ------------ -------
Preferred
On/Off
Prefix Advertised
2001:db8:a03:e102::/64
864000
604800
Onlink
Figure 4-5. Example of Show IPv6 Routers Output
4-31
IPv6 Addressing Configuration
Address Lifetimes
Address Lifetimes
Every configured IPv6 unicast and anycast address has a lifetime setting that
determines how long the address can be used before it must be refreshed or
replaced. Some addresses are set as “permanent” and do not expire. Others
have both a “preferred” and a “valid” lifetime that specify the duration of their
use and availability.
Preferred Lifetime
This is the length of time during which the address can be used freely as both
a source and a destination address for traffic exchanges with other devices.
This time span is equal to or less than the valid lifetime also assigned to the
address. If this time expires without the address being refreshed, the address
becomes deprecated and should be replaced with a new, preferred address.
In the deprecated state, an address can continue to be used as a destination
for existing communication exchanges, but is not used for new exchanges or
as a source for traffic sent from the interface. A new, preferred address and
its deprecated counterpart will both appear in the show ipv6 vlan < vid > output
as long as the deprecated address is within its valid lifetime.
Valid Lifetime
This is the total time the address is available, and is equal to or greater than
the preferred lifetime. The valid lifetime enables communication to continue
for transactions that began before the address became deprecated. However,
in this timeframe, the address should no longer be used for new communica-
tions. If this time expires without the deprecated address being refreshed, the
address becomes invalid and may be assigned to another interface.
Sources of IPv6 Address Lifetimes
Manually configured addresses have permanent lifetimes. The prefixes
received from router advertisements for global unicast addresses include
finite valid and preferred lifetime assignments. Refer to “Unicast Address
Prefixes” on page 3-11.
4-32
IPv6 Addressing Configuration
Address Lifetimes
Table 4-1. IPv6 Unicast Addresses Lifetimes
Address Source
Lifetime Criteria
Permanent
Link-Local
Statically Configured Unicast or Anycast Permanent
Autoconfigured Global
DHCPv6-Configured
Finite Preferred and Valid Lifetimes
Finite Preferred and Valid Lifetimes
A new, preferred address used as a replacement for a deprecated address can
be acquired from a manual, DHCPv6, or autoconfiguration source.
4-33
IPv6 Addressing Configuration
Address Lifetimes
4-34
5
IPv6 Management Features
Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-2
Viewing and Clearing the IPv6 Neighbors Cache . . . . . . . . . . . . . . . . 5-2
Viewing the Neighbor Cache . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-3
Clearing the Neighbor Cache . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-5
Telnet6 Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-6
Outbound Telnet6 to Another Device . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-6
Viewing the Current Telnet Activity on a Switch . . . . . . . . . . . . . . . . . 5-7
Enabling or Disabling Inbound Telnet6 Access . . . . . . . . . . . . . . . . . . 5-8
Viewing the Current Inbound Telnet6 Configuration . . . . . . . . . . . . . . 5-8
SNTP and Timep . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-9
Configuring (Enabling or Disabling) the SNTP Mode . . . . . . . . . . . . . 5-9
Configuring an IPv6 Address for an SNTP Server . . . . . . . . . . . . . . . . 5-10
Configuring (Enabling or Disabling) the Timep Mode . . . . . . . . . . . . 5-12
TFTP File Transfers Over IPv6 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-15
TFTP File Transfers over IPv6 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-15
Enabling TFTP for IPv6 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-16
Using TFTP to Copy Files over IPv6 . . . . . . . . . . . . . . . . . . . . . . . 5-17
Using Auto-TFTP for IPv6 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-19
SNMP Management for IPv6 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-20
SNMP Features Supported . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-20
SNMP Configuration Commands Supported . . . . . . . . . . . . . . . . . . . . 5-21
SNMPv1 and V2c . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-21
SNMPv3 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-21
IP Preserve for IPv6 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-23
5-1
IPv6 Management Features
Introduction
Introduction
Feature
Neighbor Cache
Telnet6
Default
n/a
CLI
5-3, 5-5
5-6, 5-7, 5-8
5-10
Enabled
None
None
n/a
SNTP Address
Timep Address
TFTP
5-13
5-15
SNMP Trap Receivers
None
5-21
This chapter focuses on the IPv6 application of management features in
software release K.13.01 that support both IPv6 and IPv4 operation. For
additional information on these features, refer to the current Management
and Configuration Guide for your switch.
Viewing and Clearing the IPv6 Neighbors
Cache
Neighbor discovery occurs when there is communication between the switch
and another, reachable IPv6 device on the same VLAN. A neighbor destination
is reachable from a given source address if a confirmation (neighbor solicita-
tion) has been received at the source verifying that traffic has been received
at the destination.
The switch maintains an IPv6 neighbor cache that is populated as a result of
communication with other devices on the same VLAN. You can view and clear
the contents of the neighbor cache using the commands described in this
section.
Anycast Addresses. Multiple, duplicate addresses configured as Anycast
on different devices are special cases of unicast addresses and are not identi-
fied as duplicates by the Neighbor Discovery process. Refer to “Anycast
Addresses” on page 3-20.
5-2
IPv6 Management Features
Viewing and Clearing the IPv6 Neighbors Cache
Viewing the Neighbor Cache
Neighbor discovery occurs when there is communication between IPv6
devices on a VLAN. The Neighbor Cache retains data for a given neighbor until
the entry times out. For more on this topic, refer to “Neighbor Discovery (ND)”
on page 4-17.
Syntax: show ipv6 neighbors [vlan < vid >]
Displays IPv6 neighbor information currently held in the
neighbor cache. After a period without communication with
a given neighbor, the switch drops that neighbor’s data from
thecache. ThecommandlistsneighborsforallVLANinterfaces
on the switch or for only the specified VLAN. The following
fields are included for each entry in the cache:
IPv6 Address: Lists the 128-bit addresses for the local host and
any neighbors (on the same VLAN) with whom there has been
recent communication.
MAC Address: The MAC Address corresponding to each of the
listed IPv6 addresses.
VLAN < vid >: Optional. Causes the switch to list only the IPv6
neighbors on a specific VLAN configured on the switch.
Type: Appears only when VLAN is not specified, and indicates
whether the corresponding address is local (configured on the
switch) or dynamic (configured on a neighbor device).
Age: Appears only when VLAN is specified, and indicates the
length of time the entry has remained unused.
Port: Identifies the switch port on which the entry was learned.
If this field is empty for a given address, then the address is
configured on the switch itself.
State: A neighbor destination is reachable from a given source
address if confirmation has been received at the source veri-
fying that traffic has been received at the destination. This
field shows the reachability status of each listed address:
•
INCOM (Incomplete): Neighbor address resolution is in
progress, but has not yet been determined.
•
REACH (Reachable): The neighbor is known to have been
reachable recently.
— Continued on the next page. —
5-3
IPv6 Management Features
Viewing and Clearing the IPv6 Neighbors Cache
— Continued from previous page. —
•
STALE: A timeout has occurred for reachability of the neigh-
bor, and an unsolicited discovery packet has been received
from the neighbor address. If the path to the neighbor is then
used successfully, this state is restored to REACH.
•
•
DELAY: Indicates waiting for a response to traffic sent
recently to the neighbor address. The time period for
determining the neighbor's reachability has been extended.
PROBE: The neighbor may not be reachable. Periodic, unicast
neighbor solicitations are being sent to verify reachability.
ProCurve(config)# show ipv6 neighbor
IPv6 ND Cache Entries
IPv6 Address
MAC Address State Type
Port
--------------------------------------- ------------- ----- ------- ----
2001:db8:260:212::101
2001:db8:260:214::1:15
fe80::1:1
0013c4-dd14b0 STALE dynamic A1
001279-88a100 REACH local
001279-88a100 REACH local
fe80::10:27
fe80::213:c4ff:fedd:14b0
001560-7aadc0 REACH dynamic A3
0013c4-dd14b0 REACH dynamic A1
Figure 5-1. Example of Neighbor Cache Without Specifying a VLAN
ProCurve(config)# show ipv6 neighbor vlan 10
IPv6 ND Cache Entries
IPv6 Address
MAC Address State Age
Port
------------------------------------- ------------- ----- ------------- ----
2001:db8:260:212::101
2001:db8:260:214::1:15
fe80:1a3::1:1
0013c4-dd14b0 STALE 5h:13m:44s
001279-88a100 REACH 11h:15m:23s B17
001279-88a100 REACH 9h:35m:11s B12
A1
fe80:::10:27
fe80::213:c4ff:fedd:14b0
001560-7aadc0 REACH 22h:26m:12s A3
0013c4-dd14b0 REACH 23 0h:32m:36s A1
Figure 5-2. Example of Neighbor Cache Content for a Specific VLAN
5-4
IPv6 Management Features
Viewing and Clearing the IPv6 Neighbors Cache
Clearing the Neighbor Cache
When there is an event such as a topology change or an address change, the
neighbor cache may have too many entries to allow efficient use. Also, if an
unauthorized client is answering DAD or normal neighbor solicitations with
invalid replies, the neighbor cache may contain a large number of invalid
entries and communication with some valid hosts may fail and/or the show
ipv6 neighbors command output may become too cluttered to efficiently read.
In such cases, the fastest way to restore optimum traffic movement on a VLAN
may be to statically clear the neighbor table instead of waiting for the
unwanted entries to time-out.
Syntax: clear ipv6 neighbors
Executed at the global config level, this command removes all
nonlocal IPv6 neighbor addresses and corresponding MAC
addresses from the neighbor cache. (Local IPv6 addresses, that
is, IPv6 addresses configured on the VLAN interface for the
switch on which the command is executed, are not removed.)
Removed addresses are listed in the command output.
ProCurve(config)# clear ipv6 neighbors
2001:db8:260:212::1%vlan10 deleted
fe80:::10:27%vlan10 deleted
fe80::213:c4ff:fedd:14b0%vlan10 deleted
Figure 5-3. Example of Clearing the IPv6 Neighbors Cache
5-5
IPv6 Management Features
Telnet6 Operation
Telnet6 Operation
This section describes Telnet operation for IPv6 on the switch. For IPv4 Telnet
operation, refer to the Management and Configuration Guide for your
switch.
Outbound Telnet6 to Another Device
Syntax: telnet < link-local-addr >%vlan< vid >
telnet < global-unicast-addr >
Outbound Telnet6 establishes a Telnet session from the switch
CLI to another IPv6 device, and includes these options.
• Telnet for Link-Local Addresses on the same VLAN requires
the link-local address and and interface scope:
< link-local-addr >: Specifies the link-local IPv6 address of
the destination device.
%vlan< vid >: Suffix specifying the interface on which the
destination device is located. No spaces are allowed in the
suffix.
• TelnetforGlobalUnicastAddressesrequiresaglobalunicast
address for the destination. Also, the switch must be
receiving router advertisements from an IPv6 gateway
router.
< global-unicast-addr >: Specifies the global IPv6 address of
the destination device.
For example, to Telnet to another IPv6 device having a link-local address of
fe80::215:60ff:fe79:8980 and on the same VLAN interface (VLAN 10), you
would use the following command:
ProCurve(config)# telnet fe80::215:60ff:fe79:980%vlan10
If the switch is receiving router advertisements from an IPv6 default gateway
router, you can Telnet to a device on the same VLAN or another VLAN or
subnet by using its global unicast address. For example, to Telnet to a device
having an IPv6 global unicast address of 2001:db8::215:60ff:fe79:980, you
would enter the following command:
ProCurve(config)# telnet 2001:db8::215:60ff:fe79:980
5-6
IPv6 Management Features
Telnet6 Operation
Viewing the Current Telnet Activity on a Switch
show telnet
Syntax:
This command shows the active incoming and outgoing telnet
sessions on the switch (for both IPv4 and IPv6). Command
output includes the following:
Session: The session number. The switch allows one outbound
session and up to five inbound sessions.
Privilege: Manager or Operator.
From: Console (for outbound sessions) or the source IP address
of the inbound session.
To: The destination of the outbound session, if in use.
For example, the following figure shows that the switch is running one
outbound, IPv4 session and is being accessed by two inbound sessions.
ProCurve# show telnet
Telnet Activity
--------------------------------------------------------
Session :
1
Privilege: Manager
From
To
: Console
: 10.0.10.140
--------------------------------------------------------
Session :
Privilege: Manager
2
From
To
: 2620:0:260:212::2:219
:
--------------------------------------------------------
Session : ** 3
The **in the “Session: indicates the
Privilege: Manager
sessionthroughwhichshowtelnetwas
From
To
: fe80::2:101
:
run.
Figure 5-4. Example of Show Telnet Output with Three Sessions Active
5-7
IPv6 Management Features
Telnet6 Operation
Enabling or Disabling Inbound Telnet6 Access
[ no ] telnet6-server
Syntax:
This command is used at the global config level to enable (the
default) or disable inbound Telnet6 access to the switch.
The no form of the command disables inbound telnet6.
Note: To disable inbound Telnet access completely, you
must disable Telnet access for both IPv6 and IPv4. (The
command for disabling Telnet4 access is no telnet-server.)
For example, to disable Telnet6 access to the switch, you would use this com-
mand:
ProCurve(config)# no telnet6-server
Viewing the Current Inbound Telnet6 Configuration
show console
Syntax:
This command shows the current configuration of IPv4 and
IPv6 inbound telnet permissions, as well as other informa-
tion. For both protocols, the default setting allows inbound
sessions.
LPE-5400-a100(config)# show console
Console/Serial Link
Telnet6 Setting
Inbound Telnet Enabled [Yes] : Yes
Inbound Telnet6 Enabled [Yes] : Yes
Web Agent Enabled [Yes] : Yes
Terminal Type [VT100] : VT100
Screen Refresh Interval (sec) [3] : 3
Displayed Events [All] : All
Baud Rate [Speed Sense] : speed-sense
Flow Control [XON/XOFF] : XON/XOFF
Session Inactivity Time (min) [0] : 0
Figure 5-5. Show Console Output Showing Default Console Configuration
5-8
IPv6 Management Features
SNTP and Timep
SNTP and Timep
Configuring (Enabling or Disabling) the SNTP Mode
Software release K.13.01 enables configuration of a global unicast address for
IPv6 SNTP time server.
This section lists the SNTP and related commands, including an example of
using an IPv6 address. For the details of configuring SNTP on the switch, refer
to the chapter titled “Time Protocols” in the Management and Configuration
Guide for your switch.
The following commands are available at the global config level for SNTP
operation.
Commands Affecting SNTP
show sntp
Function
Display the current SNTP configuration.
timesync < sntp | timep >
Enable either SNTP or Timep as the time
synchronization method on the switch without
affecting the configuration of either.
[no] timesync
[ no ]sntp
Enable time synchronization. (Requires a timesync
method to also be enabled.) The no version disable
time synchronization without affecting the
configuration of the current time synchronization
method.)
Enables SNTP with the current SNTP configuration.
The no version disables SNTP without changing the
current SNTP configuration.
sntp < unicast | broadcast > Configures the SNTP mode. (Default: Broadcast)
sntp < 30 - 720 >
Changes the interval between time requests.
(Default: 720 seconds)
5-9
IPv6 Management Features
SNTP and Timep
Configuring an IPv6 Address for an SNTP Server
N o t e
To use a global unicast IPv6 address to configure an IPv6 SNTP time server
on the switch, the switch must be receiving advertisements from an IPv6
router on a VLAN configured on the switch.
To use a link-local IPv6 address to configure an IPv6 SNTP time server on the
switch, itis necessary toappend %vlan followedimmediately (without spaces)
by the VLAN ID of the VLAN on which the server address is available. (The
VLAN must be configured on the switch.) For example:
fe80::11:215%vlan10
Syntax:. [no ] sntp server priority < 1 - 3 > < link-local-addr >%vlan< vid > [1 - 7]
[no ] sntp server priority < 1 - 3 > < global-unicast-addr > [1 - 7]
Configures an IPv6 address for an SNTP server.
server priority < 1 - 3 >: Specifies the priority of the server ad-
dressing being configured. When the SNTP mode is set to uni-
cast and more than one server is configured, this value
determines the order in which the configured servers will be
accessed for a time value. The switch polls multiple servers in
order until a response is received or all servers on the list have
been tried without success. Up to three server addresses (IPv6
and/or IPv4) can be configured.
< link-local-addr >: Specifies the link-local IPv6 address of the
destination device.
%vlan< vid >: Suffix specifying the interface on which the des-
tination device is located. No spaces are allowed in the suffix.
< global-unicast-addr >: Specifies the global IPv6 address of the
destination device.
[ 1 - 7 ]: This optional setting specifies the SNTP server version
expected for the specified server. (Default: 3)
5-10
IPv6 Management Features
SNTP and Timep
For example, to configure link-local and global unicast SNTP server addresses
of:
■
fe80::215:60ff:fe7a:adc0 (on VLAN 10, configured on the switch)
2001:db8::215:60ff:fe79:8980
■
as the priority “1” and “2” SNTP servers, respectively, using version 7, you
would enter these commands at the global config level, as shown below.
ProCurve(config)# sntp server priority 1
fe80::215:60ff:fe7a:adc0%vlan10 7
ProCurve(config)# sntp server priority 2
2001:db8::215:60ff:fe79:8980 7
N o t e
In the preceeding example, using a link-local address requires that you specify
the local scope for the address; VLAN 10 in this case. This is always indicated
by %vlan followed immediately (without spaces) by the VLAN identifier.
Syntax:. show sntp
Displays the current SNTP configuration, including the
following:
Time Sync Mode: Indicates whether timesync is disabled or set
to either SNTP or Timep. (Default: timep)
SNTP Mode: Indicates whether SNTP uses the broadcast or
unicast method of contacting a time server. The broadcast
option does not require you to configure a time server address.
The unicast option does require configuration of a time server
address.
Poll Interval: Indicates the interval between consecutive time
requests to an SNTP server.
Priority:Indicatestheconfiguredpriorityforthecorresponding
SNTP server address.
SNTP Server Address: Lists the currently configured SNTP
server addresses.
Protocol Version: Lists the SNTP server protocol version to
expect from the server at the corresponding address.
5-11
IPv6 Management Features
SNTP and Timep
For example, the show sntp output for the preceeding sntp server command
example would appear as follows:
ProCurve(config)# show sntp
SNTP Configuration
This example illustrates the
command output when both
IPv6 and IPv4 server
Time Sync Mode: Sntp
SNTP Mode : Broadcast
addresses are configured.
Poll Interval (sec) [720] : 719
Priority SNTP Server Address
Protocol Version
-------- ---------------------------------------------- ----------------
1
2
2001:db8::215:60ff:fe79:8980
10.255.5.24
7
3
Figure 5-6. Example of Show SNTP Output with Both an IPv6 and an IPv4 Server Address Configured
Note that the show management command can also be used to display SNTP
server information.
Configuring (Enabling or Disabling) the Timep Mode
Software release K.13.01 enables configuration of a global unicast address for
IPv6 Timep time server.
This section lists the Timep and related commands, including an example of
using an IPv6 address. For the details of configuring Timep on the switch, refer
to the chapter titled “Time Protocols” in the Management and Configuration
Guide for your switch.
The following commands are available at the global config level for Timep
operation.
Commands Affecting Timep
show timep
Function
Display the current timep configuration.
timesync < sntp | timep >
Enable either SNTP or Timep as the time
synchronization method on the switch without
affecting the configuration of either.
ip timep dhcp [ interval
< 1 - 9999 >]
Enable Timep operation with a Timep server
assignment configured from an IPv4 or IPv6 DHCP
server. Optionally change the interval between time
requests.
5-12
IPv6 Management Features
SNTP and Timep
ip timep manual < ipv6-addr > Enable Timep operation with a statically configured
[ interval < 1 - 9999 >]
IPv6 address for a Timep server. Optionally change
the interval between time requests.
no ip timep
Disables Timep operation. To re-enable Timep, it is
necessary to reconfigure either the DHCP or the
static option.
N o t e
To use a global unicast IPv6 address to configure an IPv6 Timep server on the
switch, the switch must be receiving advertisements from an IPv6 router on
a VLAN configured on the switch.
To use a link-local IPv6 address to configure an IPv6 Timep server on the
switch, itis necessary to append %vlan followed (without spaces) by the VLAN
ID of the VLAN on which the server address is available. The VLAN must be
configured on the switch. For example: fe80::11:215%vlan10
Syntax:. ip timep dhcp [ interval < 1 - 9999 >]
ip timep manual < ipv6-addr | ipv4-addr > [ interval < 1 - 9999 >]
Used at the global config level to configure a Timep server ad-
dress.
Note: The switch allows one Timep server configuration.
timep dhcp: Configures the switch to obtain the address of a
Timep server from an IPv4 or IPv6 DHCP server.
timep manual: Specifies static configuration of a Timep server
address.
< ipv6-addr >: Specifies the IPv6 address of an SNTP server. Re-
fer to preceeding Note.
[ Interval < 1 - 9999 > ]: This optional setting specifies the inter-
val in minutes between Timep requests. (Default: 720)
For example, to configure a link-local Timep server address of:
fe80::215:60ff:fe7a:adc0
where the address is on VLAN 10, configured on the switch, you would enter
this command at the global config level, as shown below.
5-13
IPv6 Management Features
SNTP and Timep
ProCurve(config)# ip timep manual
fe80::215:60ff:fe7a:adc0%vlan10
N o t e
In the preceeding example, using a link-local address requires that you specify
the local scope for the address; VLAN 10 in this case. This is always indicated
by %vlan followed immediately (without spaces) by the VLAN identifier. For
a global unicast address, you would enter the address withoutthe %vlan suffix.
Syntax:. show timep
Displays the current Timep configuration, including the
following:
Time Sync Mode: Indicates whether timesync is disabled or set
to either SNTP or Timep. (Default: Disabled)
Timep Mode: Indicates whether Timep is configured to use a
DHCP server to acquire a Timep server address or to use a
statically configured Timep server address.
Server Address: Lists the currently configured Timep server
address.
Poll Interval (min) [720]: Indicates the interval between
consecutive time requests to the configured Timep server.
For example, the show timep output for the preceeding ip timep manual
command example would appear as follows:
ProCurve(config)# sho timep
Timep Configuration
Time Sync Mode: Timep
TimeP Mode [Disabled] : Manual
Server Address : fe80::215:60ff:fe7a:adc0%vlan10
Poll Interval (min) [720] : 720
Figure 5-7. Example of Show Timep Output with an IPv6 Server Address Configured
Note that the show management command can also be used to display Timep
server information.
5-14
IPv6 Management Features
TFTP File Transfers Over IPv6
TFTP File Transfers Over IPv6
TFTP File Transfers over IPv6
You can use TFTP copy commands over IPv6 to upload, or download files to
and from a physically connected device or a remote TFTP server, including:
■
■
■
■
■
Switch software
Software images
Switch configurations
ACL command files
Diagnostic data (crash data, crash log, and event log)
For complete information on how to configure TFTP file transfers between
the switch and a TFTP server or other host device on the network, refer to the
your switch.
To upload and/or download files to the switch using TFTP in an IPv6 network,
1. Enable TFTP for IPv6 on the switch (see “Enabling TFTP for IPv6” on
page 5-16).
2. Enter a TFTP copy command with the IPv6 address of a TFTP server in
the command syntax (see “Using TFTP to Copy Files over IPv6” on page 5-
17).
3. (Optional) To enable auto-TFTP operation, enter the auto-tftp command
(see “Using Auto-TFTP for IPv6” on page 5-19).
5-15
IPv6 Management Features
TFTP File Transfers Over IPv6
Enabling TFTP for IPv6
TFTP for IPv6 is enabled by default on the switch. However, if it is disabled,
you can re-enable it by specifying TFTP client or server functionality with the
tftp6 <client | server> command. Enter the tftp6 <client | server> command at
the global configuration level.
tftp6 <client | server>
Syntax:
Enables TFTP for IPv6 client or server functionality so that the
switch can:
• Use TFTP client functionality to access IPv6-based TFTP
servers in the network to receive downloaded files.
• Use TFTP server functionality to be accessed by other IPv6
hosts to upload files to an IPv6 host.
U s a g e N o t e s
To disable all TFTP client or server operation on the switch except for the
auto-TFTP feature, enter the no tftp6 <client | server> command. To re-enable
When TFTP is disabled, instances of TFTP in the CLI copy command and the
Menu interface “Download OS” screen become unavailable.
The no tftp6 <client | server> command does not disable auto-TFTP operation.
For more information, see “Using Auto-TFTP for IPv6” on page 5-19.
5-16
IPv6 Management Features
TFTP File Transfers Over IPv6
Using TFTP to Copy Files over IPv6
Use the TFTP copy commands described in this section to:
■
Download specified files from a TFTP server to a switch on which TFTP
client functionality is enabled.
■
Upload specified files from a switch, on which TFTP server functionality
is enabled, to a TFTP server.
Syntax: copy tftp < target > < ipv6-addr > < filename >
Copies (downloads) a data file from a TFTP server at the
specified IPv6 address to a target file on a switch that is
enabled with TFTP server functionality.
< ipv6-addr >: If this is a link-local address, use this IPv6
address format:
fe80::< device-id >%vlan< vid >
For example: fe80::123%vlan10
If this is a global unicast or anycast address, use this IPv6
format:
< ipv6-addr >
For example: 2001:db8::123
< target > is one of the following values:
■
autorun-cert-file: Copies an autorun trusted certificate to
the switch.
■
■
autorun-key-file: Copies an autorun key file to the switch.
command-file: Copies a file stored on a remote host and
executes the ACL command script on the switch.
Depending on the ACL commands stored in the file, one
ofthefollowingactionsisperformedintherunning-config
file on the switch:
•
•
•
A new ACL is created.
An existing ACL is replaced.
match, permit, or deny statements are added to an
existing ACL.
For more information on ACLs, refer to “Creating an
ACL Offline” in the Access Control Lists (ACLs) chapter
in the Access Security Guide.
■
config < filename >: Copies the contents of a file on a
remote host to a configuration file on the switch.
5-17
IPv6 Management Features
TFTP File Transfers Over IPv6
■
flash < primary | secondary >: Copies a software file stored
on a remote host to primary or secondary flash memory
on the switch. To run a newly downloaded software
image, enter the reload or boot system flash command.
■
■
pub-key-file: Copies a public-key file to the switch.
startup-config: Copies a configuration file on a remote
host to the startup configuration file on the switch.
.
copy <source > tftp < ipv6-addr > < filename > < pc | unix >
Syntax:
Copies (uploads) a source data file on a switch that is
enabled with TFTP server functionality to a file on the TFTP
server at the specified IPv6 address, where <source> is one
of the following values:
■
■
■
command-output < cli-command >: Copies the output of a
CLI command to the specified file on a remote host.
config < filename >: Copies the specified configuration file
to a remote file on a TFTP server.
crash-data < slot-id | master >: Copies the contents of the
crash data file to the specified file path on a remote host.
The crash data is software-specific and used to deter-
mine the cause of a system crash. You can copy crash
information from an individual slot or from the master
crash file on the switch.
■
crash-log < slot-id | master >: Copies the contents of the
crash log to the specified file path on a remote host. The
crash log contains processor-specific operational data
that is used to determine the cause of a system crash.
You can copy the contents of the crash log from an
individual slot or from the master crash log on the
switch.
■
■
event-log: Copies the contents of the Event Log on the
switch to the specified file path on a remote host.
flash < primary | secondary >: Copies the software file used
as the primary or secondary flash image on the switch
to a file on a remote host.
■
■
startup-config: Copies the startup configuration file in
flash memory to a remote file on a TFTP server.
running-config: Copies the running configuration file to
a remote file on a TFTP server.
5-18
IPv6 Management Features
TFTP File Transfers Over IPv6
< ipv6-addr >: If this is a link-local address, use this IPv6
address format:
fe80::< device-id >%vlan< vid >
For example: fe80::123%vlan10
If this is a global unicast or anycast address, use this IPv6
format:
< ipv6-addr >
For example: 2001:db8::123
Using Auto-TFTP for IPv6
The auto-TFTP for IPv6 feature automatically downloads a software image to
a switch, on which TFTP client functionality is enabled, from a specified IPv6-
based device at switch startup. You must reboot the switch to implement the
downloaded software image by entering the boot system flash primary or reload
command
auto-tftp <ipv6-addr > <filename >
Syntax:
Configures the specified software file on the TFTP server at
the specified IPv6 address to be automatically downloaded
into primary flash memory at switch startup.
Note: In order for the auto-TFTP feature to copy a
software image to primary flash memory, the version
number of the downloaded software file (for example,
E.10.78) must be different from the version number of
the primary flash image.
The no form of the command disables auto-TFTP operation.
This command deletes the auto-tftp entry from the startup
configuration, and preventsauto-tftpoperationiftheswitch
reboots.
The no auto-tftp command does not affect the current TFTP-
enabled configuration on the switch.
5-19
IPv6 Management Features
SNMP Management for IPv6
SNMP Management for IPv6
As with SNMP for IPv4, you can manage a switch via SNMP from an IPv6-
based network management station by using an application such as ProCurve
Manager (PCM) or ProCurve Manager Plus (PCM+). (For more on PCM and
PCM+, go to the ProCurve Networking web site at www.procurve.com.)
SNMP Features Supported
The same SNMP for IPv4 features are supported over IPv6:
■
access to a switch using SNMP version 1, version 2c, or version 3
■
enhanced security with the configuration of SNMP communities and
SNMPv3 user-specific authentication password and privacy (encryption)
settings
■
SNMP notifications, including:
•
•
•
SNMP version 1 or SNMP version 2c traps
SNMPv2c informs
SNMPv3 notification process, including traps
■
■
■
■
Advanced RMON (Remote Monitoring) management
ProCurve Manager or ProCurve Manager Plus management applications
Flow sampling using sFlow
Standard MIBs, such as the Bridge MIB (RFC 1493) and the Ethernet MAU
MIB (RFC 1515)
5-20
IPv6 Management Features
SNMP Management for IPv6
SNMP Configuration Commands Supported
IPv6 addressing is supported in the following SNMP configuration commands:
For more information on each SNMP configuration procedure, refer to the
“Configuring for Network Management Applications” chapter in the current
Management and Configuration Guide for your switch.
SNMPv1 and V2c
Syntax:. snmp-server host < ipv4-addr | ipv6-addr > < community-name >
[none | all | non-info | critical | debug] [inform [retries < count >]
[timeout < interval >]]
Executed at the global config level to configure an SNMP trap
receiver to receive SNMPv1 and SNMPv2c traps, SNMPv2c
informs, and (optionally) event log messages
SNMPv3
Syntax: snmpv3 targetaddress < name > params < parms_name >
<ipv4-addr | ipv6-addr>
[addr-mask < ip4-addr >]
[filter < none | debug | all | not-info | critical>]
[max-msg-size < 484-65535 >]
[port-mask < tcp-udp port >]
[retries < 0 - 255 >]
[taglist <tag_name> ]
[timeout < 0 - 2147483647 >]
[udp-port port-number]
Executed at the global config level to configure an SNMPv3
management station to which notifications (traps and informs)
are sent.
N o t e
IPv6 is not supported in the configuration of an interface IPv6 address as the
default source IP address used in the IP headers of SNMP notifications (traps
and informs) or responses sent to SNMP requests. Only IPv4 addresses are
snmp-server trap-source < ipv4-addr | loopback < 0-7 >>
snmp-server response-source [dst-ip-of-request | ipv4-addr | loopback < 0-7 >]
IPv6 addresses are supported in SNMP show command output as shown in
Figure 5-8 and Figure 5-9.
5-21
IPv6 Management Features
SNMP Management for IPv6
The show snmp-server command displays the current SNMP policy
configuration, including SNMP communities, network security notifications,
link-change traps, trap receivers (including the IPv4 or IPv6 address) that can
receive SNMPv1 and SNMPv2c traps, and the source IP (interface) address
used in IP headers when sending SNMP notifications (traps and informs) or
responses to SNMP requests.
ProCurve(config)# show snmp-server
SNMP Communities
Community Name
MIB View Write Access
-------------------- -------- ------------
public
marker
Manager Unrestricted
Manager Unrestricted
Trap Receivers
Link-Change Traps Enabled on Ports [All] : All
Traps Category
Current Status
---------------
: Extended
----------------------------
SNMP Authentication
Password change
: Enabled
Login failures
: Enabled
: Enabled
Port-Security
Authorization Server Contact : Enabled
DHCP-Snooping
: Enabled
: Enabled
Dynamic ARP Protection
Address
Community
Events Type Retry Timeout
---------------------- ---------------------- -------- ------ ------- -------
15.29.17.218
public
public
All
trap 3
15
15
15.29.17.219
Critical trap 3
2620:0000:0260:0211
:0217:a4ff:feff:1f70 marker
Critical trap 3
15
Excluded MIBs
Snmp Response Pdu Source-IP Information
Selection Policy : rfc1517
An IPv6addressis
displayedontwolines.
Trap Pdu Source-IP Information
Selection Policy : rfc1517
Figure 5-8. “show snmp-server” Command Output with IPv6 Address
5-22
IPv6 Management Features
IP Preserve for IPv6
Theshowsnmpv3targetaddress commanddisplaystheconfiguration(including
the IPv4 or IPv6 address) of the SNMPv3 management stations to which
notification messages are sent.
ProCurve(config)# show snmpv3 targetaddress
snmpTargetAddrTable [rfc2573]
Target Name IP Address
Parameter
------------------------- ---------------------- ---------------------------
1
15.29.17.218
15.29.17.219
15.29.17.217
2620:0:260:211
1
2
2
PP.217
PP.218
marker_p
:217:a4ff:feff:1f70 marker_p
An IPv6 address is
displayed on two lines.
Figure 5-9. “show snmpv3 targetaddress” Command Output with IPv6 Address
IP Preserve for IPv6
IPv6 supports the IP Preserve feature, which allows you to copy a configura-
tion file from a TFTP server to multiple switches without overwriting the IPv6
address and subnet mask on VLAN 1 (default VLAN) in each switch, and the
Gateway IPv6 address assigned to the switch.
To configure IP Preserve, enter the ip preserve statement at the end of the
configuration file that will be downloaded from a TFTP server. (Note that you
do not invoke IP Preserve by entering a command from the CLI).
5-23
IPv6 Management Features
IP Preserve for IPv6
; J8697A Configuration Editor; Created on release #K.13.01
hostname "ProCurve"
time daylight-time-rule None
*
*
*
Entering an ip preserve statement as the last line in a
*
configuration file stored on a TFTP server allows you to download
and execute the file as the startup-config file on an IPv6 switch.
When the switch reboots, the configuration settings in the
address and gateway assigned to the switch as shown in Figure
5-11.
*
*
password manager
password operator
ip preserve
Figure 5-10. Example of How to Enter IP Preserve in a Configuration File
To download an IP Preserve configuration file to an IPv6-based switch, enter
the TFTP copy command as described in “TFTP File Transfers over IPv6” on
page 5-15 to copy the file as the new startup-config file on a switch.
When you download an IP Preserve configuration file, the following rules
apply:
■
If the switch’s current IPv6 address for VLAN 1 was statically configured
and not dynamically assigned by a DHCP/Bootp server, the switch reboots
and retains its current IPv6 address, subnet mask, and gateway address.
All other configuration settings in the downloaded configuration file are
applied.
■
If the switch’s current IPv6 address for VLAN 1 was assigned from a DHCP
server and not statically configured, IP Preserve is suspended. The IPv6
addressing specified in the downloaded configuration file is implemented
when the switch copies the file and reboots.
•
If the downloaded file specifies DHCP/Bootp as the source for the
IPv6 address of VLAN 1, the switch uses the IPv6 address assigned by
the DHCP/Bootp server.
•
If the file specifies a dedicated IPv6 address and subnet mask for
VLAN 1 and a Gateway IPv6 address, the switch implements these
settings in the startup-config file.
To verify how IP Preserve was implemented in a switch, after the switch
reboots, enter the show run command. Figure 5-11 shows an example in which
all configurations settings have been copied into the startup-config file except
for the IPv6 address of VLAN 1 (2001:db8::214:c2ff:fe4c:e480) and the default
IPv6 gateway (2001:db8:0:7::5), which were retained.
5-24
IPv6 Management Features
IP Preserve for IPv6
Note that if a switch received its IPv6 address from a DHCP server, the “ip
address” field under “vlan 1” would display: dhcp-bootp.
ProCurve(config)# show run
Running configuration:
; J8715A Configuration Editor; Created on release #K.13.01
Because the switch’s IPv6 address and
hostname "ProCurve"
default gateway were statically configured
(not assigned by a DHCP server), when the
switch boots up with the IP Preserve startup
configuration file (see Figure 5-10), its current
IPv6 address, subnet mask, and default
gateway are not changed.
module 1 type J8702A
module 2 type J8705A
trunk A11-A12 Trk1 Trunk
ip default-gateway 2001:db8:0:7::5
snmp-server community "public" Unrestricted
vlan 1
name "DEFAULT_VLAN"
If a switch’s current IP address was acquired
from a DHCP/Bootp server, the IP Preserve
statement is ignored and the IP addresses in
the downloaded configuration file are
implemented.
untagged A1-A10,A13-A24,B1-B24,Trk1
ip address 2001:db8::214:c2ff:fe4c:e480
exit
spanning-tree Trk1 priority 4
password manager
password operator
Figure 5-11. Configuration File with Dedicated IP Addressing After Startup with IP Preserve
For more information on how to use the IP Preserve feature, refer to the
“Configuring IP Addressing” chapter in the current Management and Config-
uration Guide for your ProCurve switch.
5-25
IPv6 Management Features
IP Preserve for IPv6
5-26
6
IPv6 Management Security Features
IPv6 Management Security . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-2
Usage Notes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-3
Configuring Authorized IP Managers for Switch Access . . . . . . . . . . . 6-5
Configuring Single Station Access . . . . . . . . . . . . . . . . . . . . . . . . . . 6-5
Additional Examples of Authorized IPv6 Managers
Configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-13
Secure Shell for IPv6 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-15
Configuring SSH for IPv6 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-15
Displaying an SSH Configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-17
Secure Copy and Secure FTP for IPv6 . . . . . . . . . . . . . . . . . . . . . . . . . 6-18
6-1
IPv6 Management Security Features
IPv6 Management Security
IPv6 Management Security
parts of IPv4 management security features on the switches covered by this
guide.
Feature
Default
CLI
configure authorized IP
managers for IPv6
disabled
6-5
configuring secure shell for IPv6
disabled
disabled
6-15
6-18
enabling secure copy and secure
FTP for IPv6
This chapter describes the following IPv6-enabled management security
features included in software release K.13.01:
■
■
■
Authorized IP Managers for IPv6
Secure Shell for IPv6
Secure Copy and Secure FTP for IPv6
6-2
IPv6 Management Security Features
Authorized IP Managers for IPv6
Authorized IP Managers for IPv6
The Authorized IP Managers feature uses IP addresses and masks to deter-
mine which stations (PCs or workstations) can access the switch through the
network. This feature supports switch access through:
■
■
■
Telnet and other terminal emulation applications
Web browser interface
SNMP (with a correct community name)
As with the configuration of IPv4 management stations, the Authorized IP
Managers for IPv6 feature allows you to specify the IPv6-based stations that
can access the switch.
Usage Notes
■
You can configure up to ten authorized IPv4 and IPv6 manager addresses
on a switch, where each address applies to either a single management
station or a group of stations. Each authorized manager address consists
of an IPv4 or IPv6 address and a mask that determines the individual
management stations that are allowed access.
•
You configure authorized IPv4 manager addresses using the ip autho-
rized-managers command. For more information, refer to the “Using
Authorized IP Managers” chapter in the Access Security Guide.
•
You configure authorized IPv6 manager addresses using the ipv6
authorized-managers command. For more information, see “Configur-
ing Authorized IP Managers for Switch Access” on page 6-5.
■
You can block all IPv4-based or all IPv6-based management stations from
accessing the switch by entering the following commands:
•
To block access to all IPv4 manager addresses while allowing access
to IPv6 manager addresses, enter the ip authorized-managers 0.0.0.0
command.
•
To block access to all IPv6 manager addresses while allowing access
to IPv4 manager addresses, enter the ipv6 authorized-managers :: com-
mand. (The double colon represents an IPv6 address that consists of
all zero’s: 0:0:0:0:0:0:0:0.)
6-3
IPv6 Management Security Features
Authorized IP Managers for IPv6
■
You configure each authorized manager address with Manager or Opera-
tor-level privilege to access the switch in a Telnet, SNMPv1, or SNMPv2c
session. (Access privilege for SSH, SNMPv3, and web browser sessions
are configuredthroughthe accessapplication, notthrough theAuthorized
IP Managers feature.)
•
Manager privilege allows full access to all web browser and console
interface screens for viewing, configuration, and all other operations
available in these interfaces.
•
Operator privilege allows read-only access from the web browser and
console interfaces.
■
When you configure station access to the switch using the Authorized IP
Managers feature, the settings take precedence over the access config-
ured with local passwords, TACACS+ servers, RADIUS-assigned settings,
port-based (802.1X) authentication, and port security settings.
As a result, the IPv6 address of a networked management device must be
configured with the Authorized IP Managers feature before the switch can
authenticate the device using the configured settings from other access
security features. If the Authorized IP Managers feature disallows access
to the device, then access is denied. Therefore, with authorized IP man-
agers configured, logging in with the correct passwords is not sufficient
to access a switch through the network unless the station requesting
access is also authorized in the switch’s Authorized IP Managers config-
uration.
6-4
IPv6 Management Security Features
Authorized IP Managers for IPv6
Configuring Authorized IP Managers for Switch Access
To configure one or more IPv6-based management stations to access the
switch using the Authorized IP Managers feature, enter the ipv6 authorized-
managers command
manager>]
Configures one or more authorized IPv6 addresses to access
the switch, where:
ipv6-mask specifies the mask that is applied to an IPv6 address
to determine authorized stations. For more information, see
“UsingaMasktoConfigureAuthorizedManagementStations”
on page 6-5. Default: FFFF:FFFF:FFFF:FFFF:FFFF:FFFF:FFFF:FFFF.
access<operator|manager> specifies thelevelof access privilege
granted to authorized stations and applies only to Telnet,
SNMPv1, and SNMPv2c access. Default: Manager.
Note: The Authorized IP Manager feature does not support the
configuration of access privileges on authorized stations that
use an SSH, SNMPv3, or the web browser session to access the
switch. For these sessions, access privilege is configured with
the access application.
Using a Mask to Configure Authorized Management
Stations
The ipv6-mask parameter controls how the switch uses an IPv6 address to
determine the IPv6 addresses of authorized manager stations on your net-
work. For example, you can specify a mask that authorizes:
■
Single station access
■
Multiple station access
N o t e
Mask configuration is a method for determining the valid IPv6 addresses that
are authorized for management access to the switch. In the Authorized IP
Managers feature, the mask serves a different purpose than an IPv6 subnet
mask and is applied in a different manner.
Configuring Single Station Access
To authorize only one IPv6-based station for access to the switch, enter the
IPv6 address of the station and set the mask to
FFFF:FFFF:FFFF:FFFF:FFFF:FFFF:FFFF:FFFF.
6-5
IPv6 Management Security Features
Authorized IP Managers for IPv6
N o t e s
If you do not enter a value for the ipv6-mask parameter when you configure an
authorized IPv6 address, the switch automatically uses
FFFF:FFFF:FFFF:FFFF:FFFF:FFFF:FFFF:FFFF as the default mask (see “Configuring
Authorized IP Managers for Switch Access” on page 6-5).
If you have ten or fewer management and/or operator stations for which you
want to authorize access to the switch, it may be more efficient to configure
them by entering each IPv6 address with the default mask in a separate ipv6
authorized-managers command.
When used in a mask, “FFFF” specifies that each bit in the corresponding 16-
identical to the same “on” or “off” setting in the IPv6 address entered in the
ipv6 authorized-managers command. (The binary equivalent of FFFF is
1111 1111 1111 1111, where 1 requires the same “on” or “off” setting in an
authorized address.)
For example, as shown in Figure 6-1, if you configure a link-local IPv6 address
of FE80::202:B3FF:FE1E:8329 with a mask of
FFFF:FFFF:FFFF:FFFF:FFFF:FFFF:FFFF:FFFF, only a station having an IPv6 address of
FE80::202:B3FF:FE1E:8329 has management access to the switch.
1st
2nd
3rd
4th
5th
6th
7th
8th
Manager- or Operator-Level Access
Block Block Block Block Block Block Block Block
IPv6 Mask
FFFF FFFF FFFF FFFF FFFF FFFF FFFF FFFF The “FFFF” in each hexadecimal block
of the mask specifies that only the exact
IPv6 Address FE80 0000 0000 0000 202
B3FF FE1E 8329
value of each bit in the corresponding
block of the IPv6 address is allowed.
This mask allows management access
only to a station having an IPv6 address
of FE80::202:B3FF:FE1E:8329.
Figure 6-1. Mask for Configuring a Single Authorized IPv6 Manager Station
Configuring Multiple Station Access
To authorize multiple stations to access the switch without having to re-enter
the ipv6 authorized-managers command for each station, carefully select the
IPv6 address of an authorized IPv6 manager and an associated mask to
authorize a range of IPv6 addresses.
As shown in Figure 6-2, if a bit in any of the 4-bit binary representations of a
hexadecimal value in a mask is “on” (set to 1), then the corresponding bit in
the IPv6 address of an authorized station must match the ”on” or “off’ setting
of the same bit in the IPv6 address you enter with the ipv6 authorized-managers
command.
6-6
IPv6 Management Security Features
Authorized IP Managers for IPv6
Conversely, ina mask, a “0”binary bit means that either the “on”or“off”setting
of the corresponding IPv6 bit in an authorized address is valid and does not
have to match the setting of the same bit in the specified IPv6 address.
Figure 6-2 shows the binary expressions represented by individual hexadeci-
mal values in an ipv6-mask parameter.
Hexadecimal Value in an IPv6 Mask
Binary Equivalent
0000
0
1
0001
2
0010
3
0011
4
0100
5
0101
6
0110
7
0111
8
1000
9
1001
A
B
C
D
E
F
1010
1011
1100
1101
1110
1111
Figure 6-2. Hexadecimal Mask Values and Binary Equivalents
6-7
IPv6 Management Security Features
Authorized IP Managers for IPv6
Example. Figure 6-3 shows an example in which a mask that authorizes
switch access to four management stations is applied to the IPv6 address:
2001:DB8:0000:0000:244:17FF:FEB6:D37D. The mask is:
FFFF:FFFF:FFFF:FFF8:FFFF:FFFF:FFFF:FFFC.
1st
2nd
3rd
4th
5th
6th
7th
8th
Manager- or Operator-Level Access
Block Block Block Block Block Block Block Block
IPv6 Mask
FFFF FFFF FFFF FFFF FFFF FFFF FFFF FFFC The “F” value in the first 124 bits of the
mask specifies that only the exact value
IPv6 Address 2001 DB8
0000 0000 244
17FF FEB6 D37D
of each corresponding bit in an
authorized IPv6 address is allowed.
However, the “C” value in the last four
bits of the mask allows four possible
combinations (D37C, D37D, D37E, and
D37F) in the last block of an authorized
IPv6 address.
Figure 6-3. Example: Mask for Configuring Four Authorized IPv6 Manager Stations
Last block in Mask: FFFC
Last block in IPv6 Address: D37D
Bit Numbers
Bit Bit
15 14
Bit Bit Bit Bit
Bit Bit
Bit Bit Bit Bit Bit Bit
Bit Bit
13
12 11 10
9
8
7
6
5
4
3
2
1
0
Bit Value
F
F
F
C
FFFC: Last Block
in Mask
D37D: Last Block
in IPv6 Address
Bit Setting:
= 1 (On)
= 0 (Off)
Figure 6-4. Example: How a Mask Determines Four Authorized IPv6 Manager Addresses
As shown in Figure 6-4, if you use a mask of
FFFF:FFFF:FFFF:FFFF:FFFF:FFFF:FFFF:FFFC with an IPv6 address, you can authorize
four IPv6-based stations to access the switch. In this mask, all bits except the
last two are set to 1 (“on”); the binary equivalent of hexadecimal C is 1100.
Therefore, this mask requires the first corresponding 126 bits in an authorized
IPv6 address to be the same as in the specified IPv6 address:
2001:DB8:0000:0000:244:17FF:FEB6:D37C. However, the last two bits are set
6-8
IPv6 Management Security Features
Authorized IP Managers for IPv6
to 0 (“off”) and allow the corresponding bits in an authorized IPv6 address to
be either“on” or “off”. Asa result, only the four IPv6 addressesshownin Figure
6-5 are allowed access.
1st
2nd
3rd
4th
5th
6th
7th
8th
Block Block Block Block Block Block Block Block
IPv6 Mask
FFFF
2001
FFFF
DB8
FFFF
0000
FFFF
0000
FFFF
244
FFFF
17FF
FFFF
FFFC
IPv6 Address Entered with the “ipv6
authorized-managers” Command
FEB6
D37D
Other Authorized IPv6 Addresses
2001
2001
2001
DB8
DB8
DB8
0000
0000
0000
0000
0000
0000
244
244
244
17FF
17FF
17FF
FEB6
FEB6
FEB6
D37C
D37E
D37F
Figure 6-5. Example: How Hexadecimal C in a Mask Authorizes Four IPv6 Manager Addresses
Example. Figure 6-6 shows an example in which a mask is applied to the
IPv6 address: 2001:DB8:0000:0000:244:17FF:FEB6:D37D/64. The specified mask
FFFF:FFFF:FFFF:FFF8:FFFF:FFFF:FFFF:FFFF configureseightmanagementstationsas
authorized IP manager stations.
Note that, in this example, the IPv6 mask is applied as follows:
■
Eight management stations in different subnets are authorized by the
value of the fourth block (FFF8) in the 64-bit prefix ID (FFFF:FFFF:FFFF:FFF8)
of the mask. (The fourth block of the prefix ID is often used to define
subnets in an IPv6 network.)
The binary equivalent of FFF8 that is used to specify valid subnet IDs in the
IPv6 addresses of authorized stations is: 1111 1111 1111 1000.
The three “off” bits (1000) in the last part of the this block (FFF8) of the
mask allow for eight possible authorized IPv6 stations:
2001:DB8:0000:0000:244:17FF:FEB6:D37D
2001:DB8:0000:0001:244:17FF:FEB6:D37D
2001:DB8:0000:0002:244:17FF:FEB6:D37D
2001:DB8:0000:0003:244:17FF:FEB6:D37D
2001:DB8:0000:0004:244:17FF:FEB6:D37D
2001:DB8:0000:0005:244:17FF:FEB6:D37D
2001:DB8:0000:0006:244:17FF:FEB6:D37D
2001:DB8:0000:0007:244:17FF:FEB6:D37D
6-9
IPv6 Management Security Features
Authorized IP Managers for IPv6
■
Eachauthorized station has the same 64-bit device ID (244:17FF:FEB6:D37D)
because the value of the last four blocks in the mask is FFFF (binary value
1111 1111).
FFFF requires all bits in each corresponding block of an authorized IPv6
address to have the same “on” or “off” setting as the device ID in the
specified IPv6 address. In this case, each bit in the device ID (last four
blocks) in an authorized IPv6 address is fixed and can be only one value:
244:17FF:FEB6:D37D.
1st
2nd
3rd
4th
5th
6th
7th
8th
Manager- or Operator-Level Access
Block Block Block Block Block Block Block Block
IPv6 Mask
FFFF FFFF FFFF FFF8 FFFF FFFF FFFF FFFF In this example, the IPv6 mask allows up
to four stations in different subnets to
Authorized
IPv6 Address
2001 DB8
0000 0000 244
17FF FEB6 D37D
access the switch. This authorized IP
manager configuration is useful if only
management stations are specified by
the authorized IPv6 addresses. Refer to
Figure 6-4 for how the bitmap of the IPv6
maskdeterminesauthorizedIPmanager
stations.
Figure 6-6. Example: Mask for Configuring Authorized IPv6 Manager Stations in Different Subnets
Fourth Block in Mask: FFF8
Fourth Block in Prefix ID of IPv6 Address: 0000
Bit Numbers
Bit Bit
15 14
Bit Bit Bit Bit
Bit Bit
Bit Bit Bit Bit Bit Bit
Bit Bit
13
12 11 10
9
8
7
6
5
4
3
2
1
0
Bit Value
F
F
F
8
FFF8: Fourth Block
in Mask
0000: Fourth Block
in IPv6 Address
Bit Setting:
= 1 (On)
= 0 (Off)
Figure 6-7. Example: How a Mask Determines Authorized IPv6 Manager Addresses by Subnet
6-10
IPv6 Management Security Features
Authorized IP Managers for IPv6
Figure 6-7 shows the bits in the fourth block of the mask that determine the
valid subnets in which authorized stations with an IPv6 device ID of
244:17FF:FEB6:D37D reside.
FFF8 in the fourth block of the mask means that bits 3 - 15 of the block are fixed
and, in an authorized IPv6 address, must correspond to the “on” and “off”
settings shown for the binary equivalent 0000 in the fourth block of the IPv6
address. Conversely, bits 0 - 2 are variable and, in an authorized IPv6 address,
may be either “on” (1) or “off” (0).
As a result, assuming that the seventh and eighth bytes (fourth hexadecimal
block) of an IPv6 address are used as the subnet ID, only the following binary
expressions and hexadecimal subnetIDs are supported inthisauthorized IPv6
manager configuration:
Authorized Subnet ID in Fourth
Binary Equivalent
Hexadecimal Block of IPv6 Address
0000
0001
0002
0003
0004
0005
0006
0007
0000 0000
0000 0001
0000 0010
0000 0011
0000 0100
0000 0101
0000 0110
0000 0111
Figure 6-8. Binary Equivalents of Authorized Subnet IDs (in Hexadecimal)
6-11
IPv6 Management Security Features
Authorized IP Managers for IPv6
Displaying an Authorized IP Managers Configuration
Use the show ipv6 authorized-managers command to list the IPv6 stations
authorized to access the switch; for example:
ProCurve# show ipv6 authorized-managers
IPv6 Authorized Managers
---------------------------------------
Address : 2001:db8:0:7::5
Mask
: ffff:ffff:ffff:ffff:ffff:ffff:ffff:ffff
Access : Manager
Address : 2001:db8::a:1c:e3:3
Mask
: ffff:ffff:ffff:ffff:ffff:ffff:ffff:fffe
Access : Manager
Address : 2001:db8::214:c2ff:fe4c:e480
Mask
: ffff:ffff:ffff:ffff:ffff:ffff:ffff:ffff
Access : Manager
Address : 2001:db8::10
Mask
: ffff:ffff:ffff:ffff:ffff:ffff:ffff:ff00
Access : Operator
Figure 6-9. Example of “show ipv6 authorized-managers” Output
By analyzing the masks displayed in Figure 6-9, the following IPv6 stations are
granted access:
Mask
Authorized IPv6 Addresses
Number of
Authorized
Addresses
FFFF:FFFF:FFFF:FFFF:FFFF:FFFF:FFFF:FFFC
FFFF:FFFF:FFFF:FFFF:FFFF:FFFF:FFFF:FFFE
FFFF:FFFF:FFFF:FFFF:FFFF:FFFF:FFFF:FFFF
FFFF:FFFF:FFFF:FFFF:FFFF:FFFF:FFFF:FF00
2001:db8:0:7::4 through 2001:db8:0:7::7
2001:db8::a:1c:e3:2 and 2001:db8::a:1c:e3:3
2001:db8::214:c2ff:fe4c:e480
4
2
1
2001:db8::0 through 2001:db8::FF
256
Figure 6-10. How Masks Determine Authorized IPv6 Manager Addresses
6-12
IPv6 Management Security Features
Authorized IP Managers for IPv6
Additional Examples of Authorized IPv6 Managers
Configuration
Authorizing Manager Access. The following IPv6 commands authorize
manager-level access for one link-local station at a time. Note that when you
enter a link-local IPv6 address with the ipv6 authorized-managers command,
you must also enter a VLAN ID in the format: %vlan<vlan-id>.
ProCurve(config)# ipv6 authorized-managers
fe80::07be:44ff:fec5:c965%vlan2
ProCurve(config)# ipv6 authorized-managers
fe80::070a:294ff:fea4:733d%vlan2
ProCurve(config)# ipv6 authorized-managers
fe80::19af:2cff:fe34:b04a%vlan5
If you do not enter an ipv6-mask value when you configure an authorized IPv6
address, the switch automatically uses FFFF:FFFF:FFFF:FFFF:FFFF:FFFF:FFFF:FFFF
as the default IPv6 mask. Also, if you do not specify an access value to grant
either Manager- or Operator-level access, by default, the switch assigns Man-
ager access. For example:
ProCurve# ipv6 authorized-managers 2001:db8::a8:1c:e3:69
ProCurve# show ipv6 authorized-managers
IPv6 Authorized Managers
--------------------------
Address : 2001:db8::a8:1c:e3:69
Mask
: ffff:ffff:ffff:ffff:ffff:ffff:ffff:ffff
Access : Manager
If you do not enter a value for ipv6-mask in the ipv6 authorized-managers command, the default mask of
FFFF:FFFF:FFFF:FFFF:FFFF:FFFF:FFFF:FFFF: is applied. The default mask authorizes only the specified station (see
“Configuring Single Station Access” on page 6-5).
Figure 6-11. Default IPv6 Mask
6-13
IPv6 Management Security Features
Authorized IP Managers for IPv6
The next IPv6 command authorizes operator-level access for sixty-four IPv6
stations: thirty-two stations in the subnets defined by 0x0006 and 0x0007 in
the fourth block of an authorized IPv6 address:
ProCurve(config)# ipv6 authorized-managers
2001:db8:0000:0007:231:17ff:fec5:c967
ffff:ffff:ffff:fffe:ffff:ffff:ffff:ffe0 access operator
The following ipv6 authorized-managers command authorizes a single, automat-
ically generated (EUI-64) IPv6 address with manager-level access privilege:
ProCurve(config)# ipv6 authorized-managers
::223:04ff:fe03:4501 ::ffff:ffff:ffff:ffff
Editing an Existing Authorized IP Manager Entry. To change the mask
or access level for an existing authorized IP manager entry, enter the IPv6
address with the new value(s). Any parameters not included in the command
are reset to their default values.
The following command replaces the existing mask and access level for IPv6
address 2001:DB8::231:17FF:FEC5:C967 with
FFFF:FFFF:FFFF:FFFF:FFFF:FFFF:FFFF:FF00 and operator:
ProCurve(config)# ipv6 authorized-managers
2001:db8::231:17ff:fec5:c967
ffff:ffff:ffff:ffff:ffff:ffff:ffff:ff00 access operator
The following command replaces the existing mask and access level for IPv6
address 2001:DB8::231:17FF:FEC5:3E61 with
FFFF:FFFF:FFFF:FFFF:FFFF:FFFF:FFFF:FFFF and manager (the default values). Note
that it is not necessary to enter either of these parameters:
ProCurve(config)# ipv6 authorized-managers
2001:db8::a05b:17ff:fec5:3f61
Deleting an Authorized IP Manager Entry. Enter only the IPv6 address
of the configured authorized IP manager station that you want to delete with
the no form of the command; for example:
ProCurve(config)# no ipv6 authorized-managers
2001:db8::231:17ff:fec5:3e61
6-14
IPv6 Management Security Features
Secure Shell for IPv6
Secure Shell for IPv6
The Secure Shell (SSH) for IPv6 feature provides the same Telnet-like func-
tions through encrypted, authenticated transactions as SSH for IPv4. SSH for
IPv6 provides CLI (console) access and secure file transfer functionality. The
following types of transactions are supported:
■
Client public-key authentication
Public keys from SSH clients are stored on the switch. Access to the
switch is granted only to a client whose private key matches a stored
public key.
■
Password-only client authentication
The switch is SSH-enabled but is not configured with the login method
that authenticates a client’s public-key. Instead, after the switch authenti-
cates itself to a client, users connected to the client authenticate them-
selves to the switch by providing a valid password that matches the
operator-and/or manager-levelpasswordconfiguredandstored locallyon
the switch or on a RADIUS or TACACS+ server.
■
Secure Copy (SCP) and Secure FTP (SFTP)
You can use an SCP or SFTP client application to perform secure file
transfers to and from the switch.
Configuring SSH for IPv6
By default, SSH is automatically enabled for IPv4 and IPv6 connections on a
switch. As with SSH for IPv4, you can enter the ip ssh command to reconfigure
the default SSH settings to:
■
Restrict access to the SSH server running on the switch to only IPv4 or
IPv6 clients.
■
Modify the TCP port number and timeout period used in SSH authentica-
tion in IPv4 and IPv6 connections.
6-15
IPv6 Management Security Features
Secure Shell for IPv6
Syntax:. [no] ip ssh
EnablesSSHon theswitchandactivatestheconnection
with a configured SSH server (RADIUS or TACACS+).
To disable SSH on the switch, enter the no ip ssh com-
mand.
[ip-version < 4 | 6 | 4or6 >]
IP version used for SSH connections on the switch:
4 accepts SSH connections only from IPv4 clients.
6 accepts SSH connections only from IPv6 clients.
4or6 accepts SSH connections from either IPv4 or IPv6
clients. (Default: 4or6).
To disable SSH connections with IPv4 clients, enter the
ip ssh ip-version 6 command; to disable SSH connections
with IPv6 clients, enter the ip ssh ip-version 4 command.
[port < 1-65535 | default >]
TCP port number used for SSH sessions in IPv4 and
IPv6 connections (Default: 22).
Valid port numbers are from 1 to 65535, except for port
numbers 23, 49, 80, 280,443, 1506, 1513 and 9999,
which are reserved for other subsystems.
[timeout < 5 - 120 >]
Timeout value allowed to complete an SSH authentica-
tion and login on the switch (Default: 120 seconds).
[filetransfer]
Enables SSH on the switch to connect to an SCP or SFTP
client application to transfer files to and from the
switch over IPv4 or IPv6.
For more information, see “Secure Copy and Secure
FTP for IPv6” on page 6-18.
N o t e
As with IPv4, the switch only supports SSH version 2. You cannot set up an
SSH session with a client device running SSH version 1.
For complete information on how to configure SSH for encrypted, authenti-
cated transactions between the switch and SSH-enabled client devices, refer
to the “Configuring Secure Shell (SSH)” chapter in the Access Security
Guide.
6-16
IPv6 Management Security Features
Secure Shell for IPv6
Displaying an SSH Configuration
To verify an SSH for IPv6 configuration and display all SSH sessions running
on the switch, enter the show ip ssh command. Information on all current SSH
sessions (IPv4 and IPv6) is displayed.
ProCurve(config)# show ip ssh
SSH enabled
: Yes
: 22
: 120
: Yes
Displays the current SSH configuration and status.
TCP Port Number
Timeout (sec)
Secure Copy Enabled
IP Version
The switch uses these five SSH settings internally
for transactions with clients.
Here SSH is enabled for IPv4 and IPv6 clients.
: IPv4orIPv6
Ses Type
| Source IP
Port
--- ------ + ---------------------------- -----
1 console |
2 ssh
| 192.168.31.114
1722
3 telnet |
4 inactive |
With SSH running, the switch supports one console
session and up to five other SSH and Telnet (IPv4
and IPv6) sessions.
Web browser sessions are also supported, but are
not displayed in show ip ssh output.
Source IPv6 IP addresses of SSH clients are
displayed in hexadecimal format.
6-17
IPv6 Management Security Features
Secure Copy and Secure FTP for IPv6
Secure Copy and Secure FTP for IPv6
You can take advantage of the Secure Copy (SCP) and Secure FTP (SFTP)
client applications to provide a secure alternative to TFTP for transferring
sensitive switch information, such as configuration files and login informa-
tion, between the switch and an administrator workstation.
SCP and SFTP run over an encrypted SSH session allowing you to use a secure
SSH tunnel to:
■
Transfer files and update ProCurve software images.
■
Distributenewsoftwareimageswithautomatedscriptsthatmakeiteasier
to upgrade multiple switches simultaneously and securely.
By default, SSH is enabled for IPv4 and IPv6 connections on a switch. If you
have not disabled SSH connections from IPv6 clients (by entering the ip ssh
ip-version 4 command), you can perform secure file transfers to and from IPv6
client devices by entering the ip ssh filetransfer command.
Syntax:. [no] ip ssh filetransfer
EnablesSSHontheswitchtoconnecttoanSCPorSFTPclient
application to transfer files to and from the switch.
Use the no ip ssh filetransfer command to disable the switch’s
ability to perform secure file transfers with an SCP or SFTP
client, without disabling SSH on the switch.
After an IPv6 client running SCP/SFTP successfully authenticates and opens
an SSH session on the switch, you can copy files to and from the switch using
secure, encrypted file transfers. Refer to the documentation that comes with
an SCP or SFTP client application for information on the file transfer com-
mands and software utilities to use.
N o t e s
The switch supports one SFTP session or one SCP session at a time.
All files on the switch have read-write permission. However, several SFTP
commands, such as create or remove, are not supported and return an error
message.
For complete information on how to configure SCP or SFTP in an SSH session
to copy files to and from the switch, refer to the “File Transfers” appendix in
the Management and Configuration Guide for your switch.
6-18
7
Multicast Listener Discovery (MLD) Snooping
Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-2
Introduction to MLD Snooping . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-3
Configuring MLD . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-8
Enabling or Disabling MLD Snooping on a VLAN . . . . . . . . . . . . . . . . . 7-8
Configuring Per-Port MLD Traffic Filters . . . . . . . . . . . . . . . . . . . . . . . 7-9
Configuring the Querier . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-10
Configuring Fast Leave . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-10
Configuring Forced Fast Leave . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-11
Current MLD Status . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-12
Current MLD Configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-15
Ports Currently Joined . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-17
Statistics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-18
Counters . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-20
7-1
Multicast Listener Discovery (MLD) Snooping
Overview
Overview
Multicast addressing allows one-to-many or many-to-many communication
among hosts on a network. Typical applications of multicast communication
include audio and video streaming, desktop conferencing, collaborative com-
puting, and similar applications.
Multicast Listener Discovery (MLD) is an IPv6 protocol used on a local link
for multicast group management. MLD is enabled per VLAN, and is analogous
to the IPv4 IGMP protocol.
MLD snooping is a subset of the MLD protocol that operates at the port level
and conserves network bandwidth by reducing the flooding of multicast IPv6
packets.
This chapter describes concepts of MLD snooping and the CLI commands
available for configuring it and for viewing its status.
7-2
Multicast Listener Discovery (MLD) Snooping
Introduction to MLD Snooping
Introduction to MLD Snooping
There are several roles that network devices may play in an IPv6 multicast
environment:
■
■
■
MLD host—a network node that uses MLD to “join” (subscribe to) one
or more multicast groups
multicast router—a router that routes multicast traffic between sub-
nets
querier—a switch or multicast router that identifies MLD hosts by
sending out MLD queries, to which the MLD hosts respond
Curiously enough, a network node that acts as a source of IPv6 multicast
traffic is only an indirect participant in MLD snooping—it just provides
multicast traffic, and MLD doesn’t interact with it. (Note, however, that in an
application like desktop conferencing a network node may act as both a
source and an MLD host; but MLD interacts with that node only in its role as
an MLD host.)
A source node creates multicast traffic by sending packets to a multicast
address. In IPv6, addresses with the first eight bits set (that is, “FF” as the first
two characters of the address) are multicast addresses, and any node that
listens to such an address will receive the traffic sent to that address. Appli-
cation software running on the source and destination systems cooperates to
determine what multicast address to use. (Note that this is a function of the
application software, not of MLD.)
For example, if several employees engage in a desktop conference across the
network, they all need application software on their computers. At the start
of the conference, the software on all the computers determines a multicast
address of, say, FF3E:30:2001:DB8::101 for the conference. Then any traffic
sent to that address can be received by all computers listening on that address.
7-3
Multicast Listener Discovery (MLD) Snooping
Introduction to MLD Snooping
General operation. Multicast communication can take place without MLD,
and by default MLD is disabled. In that case, if a switch receives a packet with
a multicast destination address, it floods the packet to all ports in the same
VLAN (excepttheportthatitcame inon). Anynetworknodesthatarelistening
to that muticast address will see the packet; all other hosts ignore the packet.
MLD disabled
Listener
Switch
Source
Listener
Figure 7-1. Without MLD, multicast traffic is flooded to all ports.
When MLD snooping is enabled on a VLAN, the switch acts to minimize
unnecessary multicast traffic. If the switch receives multicast traffic destined
for a given multicast address, it forwards that traffic only to ports on the VLAN
that have MLD hosts for that address. It drops that traffic for ports on the
VLAN that have no MLD hosts (except for a few special cases explained
below).
MLD snooping enabled
Listener
(MLD host)
Switch
Source
Listener
(MLD host)
Figure 7-2. With MLD snooping, traffic is sent to MLD hosts.
7-4
Multicast Listener Discovery (MLD) Snooping
Introduction to MLD Snooping
Note that MLD snooping operates on a single VLAN (though there can be
multiple VLANs, each running MLD snooping). Cross-VLAN traffic is handled
by a multicast router.
Forwarding in MLD snooping. When MLD snooping is active, a multicast
packet is handled by the switch as follows:
■
■
■
■
forwarded to ports that have nodes that have joined the packet’s multicast
address (that is, MLD hosts on that address)
forwarded toward the querier—If the switch is not the querier, the packet
is forwarded out the port that leads to the querier.
forwarded toward any multicast routers—If there are multicast routers
on the VLAN, the packet is forwarded out any port that leads to a router.
forwarded out administratively forwarded ports—The packet will be
forwarded through all ports set administratively to forward mode. (See
the description of forwarding modes, below.)
■
dropped for all other ports
Each individual port’s forwarding behavior can be explicitly set using a CLI
command to one of these modes:
■
auto (the default mode)—The switch forwards packets through this port
based on the MLD rules and the packet’s multicast address. In most cases,
this means that the switch forwards the packet only if the port connects
to a node that is joined to the packet’s multicast address (that is, to an
MLD host). There is seldom any reason to use a mode other than “auto”
in normal operation (though some diagnostics may make use of “forward”
or “block” mode).
■
■
forward—The switch forwards all IPv6 multicast packets through the
port. This includes IPv6 multicast data and MLD protocol packets.
block—The switch drops all MLD packets received by the portand blocks
alloutgoing IPv6 multicast packets through the port, except those packets
destined for well known IPv6 multicast addresses. This has the effect of
preventing IPv6 multicast traffic from moving through the port.
Note that the switch floods all packets with “well known” IPv6 multicast
destination addresses through all ports. Well known addresses are permanent
addresses defined by the Internet Assigned Numbers Authority
(www.iana.org). IPv6 standards define any address beginning with FF0x/12
(binary 1111 1111 0000) as a well known address.
Listeners and joins. The “snooping” part of MLD snooping arises because
a switch must keep track of which ports have network nodes that are MLD
hosts for any given multicast address. It does this by keeping track of “joins”
on a per-port basis.
7-5
Multicast Listener Discovery (MLD) Snooping
Introduction to MLD Snooping
A network node establishes itself as an MLD host by issuing a multicast “join”
request (also called a multicast “report”) for a specific multicast address when
it starts an application that listens to multicast traffic. The switch to which the
node is connected sees the join request and forwards traffic for that multicast
address to the node’s port.
Queries. The querier is a multicast router or a switch that periodically asks
MLD hosts on the network to verify their multicast join requests. There is one
querier for each VLAN, and all switches on the VLAN listen to the responses
of MLD hosts to multicast queries, and forward or block multicast traffic
accordingly.
All of the ProCurve switches described by this guide have the querier function
enabled by default. If there is anotherdevice on the VLAN thatis already acting
as querier, the switch defers to that querier. If there is no device acting as
querier, the switch enters an election state and negotiates with other devices
on the network (if any) to determine which one will act as the querier.
The querier periodically sends generalqueries to MLD hosts on each multicast
address that is active on the VLAN. The time period that the querier waits
between sending general queries is known as the query interval; the MLD
standard sets the default query interval to 125 seconds.
Network nodes that wish to remain active as MLD hosts respond to the queries
with join requests; in this way they continue to assert their presence as MLD
hosts. The switch through which any given MLD host connects to the VLAN
sees the join requests and continues forwarding traffic for that multicast
address to the MLD host’s port.
Leaves. A node acting as an MLD host can be disconnected from a multicast
address in two ways:
■
It can stop sending join requests to the querier. This might happen if the
multicast application quits or the node is removed from the network. If
the switch goes for slightly more than two query intervals without seeing
a join request from the MLD host, it stops sending multicast traffic for that
multicast address to the MLD host’s port.
■
It can issue a “leave” request. This is done by the application software
running on the MLD host. If the MLD host is the only node connected to
its switch port, the switch sees the leave request and stops sending
multicast packets for that multicast address to that port. (If there is more
than one node connected to the port the situation is somewhat more
complicated, as explained below under “Fast leaves and forced fast
leaves”.)
7-6
Multicast Listener Discovery (MLD) Snooping
Introduction to MLD Snooping
Fast leaves and forced fast leaves. The fast leave and forced fast leave
functions can help to prune unnecessary multicast traffic when an MLD host
issues a leave request from a multicast address. Fast leave is enabled by
default and forced fast leave is disabled by default. Both functions are applied
to individual ports.
Which function to use depends on whether a port has more than one node
attached to it, as follows:
■
If a port has only one node attached to it, then when the switch sees a
leave request from that node (an MLD host) it knows that it does not need
to send any more multicast traffic for that multicast address to the host’s
port. If fast leave is enabled (the default setting), the switch stops sending
the multicast traffic immediately. If fast leave is disabled, the switch
continues to look for join requests from the host in response to group-
specific queries sent to the port. The interval during which the switch
looks forjoinrequestsisbriefand dependsontheforcedfastleavesetting:
if forced fast leave is enabled for the port, it is equal to the “forced fast
leave interval” (typically a couple of seconds or less); if forced fast leave
is disabled for the port, the period is about 10 seconds (governed by the
MLD standard). When this process has completed the multicast traffic for
the group will be stopped (unless the switch sees a new join request).
■
If there are multiple nodes attached to a single port, then a leave request
from one of those nodes (an MLD host) does not provide enough infor-
mation for the switch to stop sending multicast traffic to the port. In this
situation the fast leave function does not operate. The switch continues
to look for join requests from any MLD hosts connected to the port, in
response to group-specific queries sent to the port. As in the case
described above for a single-node port that is not enabled for fast leave,
the interval during which the switch looks for join requests is brief and
depends on the forced fast leave setting. If forced fast leave is enabled for
the port, it is equal to the “forced fast leave interval” (typically a couple
of seconds or less); if forced fast leave is disabled for the port, the period
is about 10 seconds (governed by the MLD standard). When this process
has completed the multicast traffic for the group will be stopped unless
the switch sees a new join request. This reduces the number of multicast
packets forwarded unnecessarily.
7-7
Multicast Listener Discovery (MLD) Snooping
Configuring MLD
Configuring MLD
Several CLI commands are available for configuring MLD parameters on a
switch.
Enabling or Disabling MLD Snooping on a VLAN
Syntax: [no] ipv6 mld
Note: This command must be issued in a VLAN context.
This command enables MLD snooping on a VLAN. Enabling
MLD snooping applies the last-saved or the default MLD
configuration, whichever was most recently set.
The [no] form of the command disables MLD snooping on a
VLAN.
MLD snooping is disabled by default.
For example, to enable MLD snooping on VLAN 8:
ProCurve# config
ProCurve(config)# vlan 8
ProCurve(vlan-8)# ipv6 mld
To disable MLD snooping on VLAN 8:
ProCurve(vlan-8)# no ipv6 mld
7-8
Multicast Listener Discovery (MLD) Snooping
Configuring MLD
Configuring Per-Port MLD Traffic Filters
Syntax: ipv6 mld [auto <port-list> | blocked <port-list> | forward <port-list>]
Note: This command must be issued in a VLAN context.
This command sets per-port traffic filters, which specify how
each port should handle MLD traffic. Allowed settings are:
auto—follows MLD snooping rules: packets are forwarded for
joined groups
blocked—allmulticastpacketsaredropped, exceptthatpackets
for well known addresses are forwarded
forward—all multicast packets are forwarded
The default value of the filter is auto.
<port-list>—specifies the affected port or range of ports
For example:
ProCurve(vlan-8)# ipv6 mld forward a16-a18
ProCurve(vlan-8)# ipv6 mld blocked a19-a21
ProCurve(vlan-8)# show ipv6 mld vlan 8 config
MLD Service Vlan Config
VLAN ID : 8
VLAN NAME : VLAN8
MLD Enabled [No] : Yes
Querier Allowed [Yes] : Yes
Port Type
| Port Mode Forced Fast Leave Fast Leave
---- --------- + --------- ----------------- ----------
A13 100/1000T | auto
A14 100/1000T | auto
A15 100/1000T | auto
A16 100/1000T | forward No
A17 100/1000T | forward No
A18 100/1000T | forward No
A19 100/1000T | blocked No
A20 100/1000T | blocked No
A21 100/1000T | blocked No
No
No
No
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
A22 100/1000T | auto
A23 100/1000T | auto
A24 100/1000T | auto
No
No
No
Figure 7-3. Example of an MLD Configuration with Traffic Filters
7-9
Multicast Listener Discovery (MLD) Snooping
Configuring MLD
Configuring the Querier
Syntax: [no] ipv6 mld querier
Note: This command must be issued in a VLAN context.
This command enables the switch to act as querier on a VLAN.
The [no] form of the command disables the switch from acting
as querier on a VLAN.
The querier function is enabled by default. If another switch
or a multicastrouter is acting as the MLD querier on theVLAN,
this switch will defer to that device. If an acting querier stops
performing the querier function, all querier-enabled switches
and multicast routers on the VLAN will enter an election to
determine the next device to act as querier.
For example, to disable the switch from acting as querier on VLAN 8:
ProCurve(vlan-8)# no ipv6 mld querier
To enable the switch to act as querier on VLAN 8:
ProCurve(vlan-8)# ipv6 mld querier
Configuring Fast Leave
Syntax: [no] ipv6 mld fastleave <port-list>
Note: This command must be issued in a VLAN context.
This command enables the fast leave function on the specified
ports in a VLAN.
The [no] form of the command disables the fast leave function
on the specified ports in a VLAN.
The fast leave function is enabled by default.
7-10
Multicast Listener Discovery (MLD) Snooping
Configuring MLD
For example, to disable fast leave on ports in VLAN 8:
ProCurve(vlan-8)# no ipv6 mld fastleave a14-a15
To enable fast leave on ports in VLAN 8:
ProCurve(vlan-8)# ipv6 mld fastleave a14-a15
Configuring Forced Fast Leave
Syntax: [no] ipv6 mld forcedfastleave <port-list>
Note: This command must be issued in a VLAN context.
This command enables the forced fast leave function on the
specified ports in a VLAN.
The [no] form of the command disables the forced fast leave
function on the specified ports in a VLAN.
The forced fast leave function is disabled by default.
For example, to enable forced fast leave on ports in VLAN 8:
ProCurve(vlan-8)# ipv6 mld forcedfastleave a19-a20
To disable forced fast leave on ports in VLAN 8:
ProCurve(vlan-8)# no ipv6 mld forcedfastleave a19-a20
7-11
Multicast Listener Discovery (MLD) Snooping
Displaying MLD Status and Configuration
Displaying MLD Status and
Configuration
Current MLD Status
Syntax: show ipv6 mld
Displays MLD status information for all VLANs on the switch
that have MLD configured.
show ipv6 mld vlan <vid>
Displays MLD status for the specified VLAN
vid—VLAN ID
For example, a switch with MLD snooping configured on VLANs 8 and 9 might
show the following information:
ProCurve# show ipv6 mld
MLD Service Protocol Info
Total vlans with MLD enabled
: 2
Current count of multicast groups joined
: 37
VLAN ID : 8
VLAN NAME : VLAN8
Querier Address : fe80::218:71ff:fec4:2f00 [this switch]
Querier Up Time : 1h:37m:20s
Querier Expiry Time : 0h:1m:44s
Ports with multicast routers :
Active Group Addresses
Type ExpiryTime Ports
---------------------------------------- ---- ---------- --------------------
ff02::c
ff02::1:2
ff02::1:3
ff02::1:ff00:42
ff02::1:ff02:2
ff02::1:ff02:3
ff02::1:ff03:2
ff02::1:ff03:3
FILT 0h:4m:9s A15-A21
FILT 0h:4m:3s A21
FILT 0h:4m:9s A15-A21
FILT 0h:4m:0s A19
FILT 0h:4m:2s A15
FILT 0h:4m:5s A16
FILT 0h:4m:2s A17
FILT 0h:4m:5s A18
Figure 7-4. Example of Displaying the MLD Configuration for All Static VLANs on the Switch
7-12
Multicast Listener Discovery (MLD) Snooping
Displaying MLD Status and Configuration
ff02::1:ff04:3
FILT 0h:4m:5s A20
ff02::1:ff05:1
FILT 0h:4m:3s A21
FILT 0h:3m:59s A17
FILT 0h:4m:4s A15
FILT 0h:4m:5s A18
FILT 0h:4m:3s A19
FILT 0h:4m:4s A20
FILT 0h:4m:0s A16
FILT 0h:4m:5s A21
FILT 0h:4m:0s A17
FILT 0h:3m:58s A20
FILT 0h:4m:0s A15
FILT 0h:4m:5s A16
FILT 0h:4m:1s A19
FILT 0h:4m:0s A18
FILT 0h:4m:4s A15,A18,A21
FILT 0h:4m:13s A16,A19
ff02::1:ff0b:2dfe
ff02::1:ff0b:d7d9
ff02::1:ff0b:da09
ff02::1:ff0b:dc38
ff02::1:ff0b:dc8d
ff02::1:ff0b:dd56
ff02::1:ff12:e0cd
ff02::1:ff4e:98a5
ff02::1:ff57:21a1
ff02::1:ff6b:dd51
ff02::1:ff7b:ac55
ff02::1:ff8f:61ea
ff02::1:ffc8:397b
ff3e:30:2001:db8:8:0:7:101
ff3e:30:2001:db8:8:0:7:102
VLAN ID : 9
VLAN NAME : VLAN9
Querier Address : fe80::218:71ff:fec4:2f00 [this switch]
Querier Up Time : 1h:37m:22s
Querier Expiry Time : 0h:1m:43s
Ports with multicast routers :
Active Group Addresses
Type ExpiryTime Ports
---------------------------------------- ---- ---------- --------------------
ff02::c
ff02::1:3
FILT 0h:4m:12s B3,B5,B7
FILT 0h:4m:12s B3,B5,B7
FILT 0h:4m:4s B3
FILT 0h:3m:59s B5
FILT 0h:4m:12s B7
FILT 0h:4m:0s B7
FILT 0h:4m:2s B3
FILT 0h:4m:4s B5
FILT 0h:4m:1s B5
FILT 0h:3m:57s B7
FILT 0h:3m:58s B3
ff02::1:ff02:4
ff02::1:ff03:4
ff02::1:ff04:4
ff02::1:ff0b:dc64
ff02::1:ff0b:dcf3
ff02::1:ff0b:dd5c
ff02::1:ff34:a69e
ff02::1:ff8e:11d5
ff02::1:ffea:2c4f
Figure 7-5. Continuation of Figure 7-4
7-13
Multicast Listener Discovery (MLD) Snooping
Displaying MLD Status and Configuration
The following information is shown for each VLAN that has MLD snooping
enabled:
■
■
■
VLAN ID number and name
Querier address: IPv6 address of the device acting as querier for the VLAN
Querier up time: the length of time in seconds that the querier has been
acting as querier
■
Querier expiry time: If this switch is the querier, this is the amount of time
until the switch sends the next general query. If this switch is not the
querier, this is the amount of time in seconds until the current querier is
considered inactive (after which a new querier election is held).
■
■
Portswithmulticast routers:portsontheVLAN thatlead towardmulticast
routers (if any)
Multicast group address information for each active group on the VLAN,
including:
•
•
the multicast group address
the type of tracking for multicast joins: standard or filtered. If MLD
snooping is enabled, port-level tracking results in filtered groups. If
MLD snooping is not enabled, joins result in standard groups being
trackedbythisdevice. Inaddition,ifhardwareresourcesformulticast
filtering are exhausted, new joins may result in standard groups even
though MLD snooping is enabled.
•
•
expiry time: the time until the group expires if no joins are seen
the ports that have joined the multicast group
The group addresses you see listed typically result from several network
functions. In our example, several of the addresses at the top of the list for
each VLAN are IANA well known addresses (see www.iana.org/assignments/
ipv6-multicast-addresses); the addresses in the form of ff02::1:ffxx:xxxx are
solicited-node multicast addresses (used inIPv6 Neighbor Discovery); and the
addresses beginning with ff3e are group addresses used by listeners to stream-
ing video feeds.
7-14
Multicast Listener Discovery (MLD) Snooping
Displaying MLD Status and Configuration
Current MLD Configuration
Syntax: show ipv6 mld config
Displays current global MLD configuration for all MLD-
enabled VLANS on the switch.
show ipv6 vlan <vid> config
Displays current MLD configuration for the specified VLAN,
including per-port configuration information.
vid—VLAN ID
For example, the general form of the command might look like this:
ProCurve# show ipv6 mld config
MLD Service Config
Control unknown multicast [Yes] : Yes
Forced fast leave timeout [4] : 4
VLAN ID VLAN NAME
MLD Enabled Querier Allowed
------- --------------- ----------- ---------------
8
9
VLAN8
VLAN9
Yes
Yes
Yes
Yes
Figure 7-6. Example of a Global MLD Configuration
The following information, for all MLD-enabled VLANs, is shown:
■
Control unknown multicast: If this is set to YES, any IPv6 multicast
packets that are not joined by an MLD host will be sent only to ports that
have detected a multicast router or ports that are administratively for-
warded. If this is set to NO (or if MLD snooping is disabled), unjoined IPv6
multicast packets will be flooded out all ports in the VLAN.
■
■
Forced fast leave timeout: the interval between an address specific query
and a forced fast leave (assuming no response), in tenths of seconds
For each VLAN that has MLD enabled:
•
•
VLAN ID and name
whether MLD is enabled on the VLAN (default NO, but the VLAN will
not show up on this list unless MLD is enabled)
•
whether the switch can act as querier for the VLAN (default YES)
7-15
Multicast Listener Discovery (MLD) Snooping
Displaying MLD Status and Configuration
The specific form of the command might look like this:
ProCurve# show ipv6 mld vlan 8 config
MLD Service Vlan Config
VLAN ID : 8
VLAN NAME : VLAN8
MLD Enabled [No] : Yes
Querier Allowed [Yes] : Yes
Port Type
| Port Mode Forced Fast Leave Fast Leave
---- --------- + --------- ----------------- ----------
A13 100/1000T | auto
A14 100/1000T | auto
A15 100/1000T | auto
A16 100/1000T | auto
A17 100/1000T | auto
A18 100/1000T | auto
A19 100/1000T | auto
A20 100/1000T | auto
A21 100/1000T | auto
A22 100/1000T | auto
A23 100/1000T | auto
A24 100/1000T | auto
No
No
No
No
No
No
No
No
No
No
No
No
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Figure 7-7. Example of an MLD Configuration for a Specific VLAN
The following information is shown, if the specified VLAN is MLD-enabled:
■
VLAN ID and name
■
whether MLD is enabled on the VLAN (default NO, but the information
for this VLAN will be listed only if MLD is enabled)
■
whether the switch is allowed to act as querier on the VLAN
7-16
Multicast Listener Discovery (MLD) Snooping
Displaying MLD Status and Configuration
Ports Currently Joined
Syntax: show ipv6 vlan <vid> group
Lists the ports currently joined for all IPv6 multicast group
addresses in the specified VLAN
vid—VLAN ID
show ipv6 vlan <vid> group <ipv6-addr>
Lists the ports currently joined for the specified IPv6 multicast
group address in the specified VLAN
vid—VLAN ID
ipv6-addr—address of the IPv6 multicast group for which you
want information
For example, the general form of the command is shown below. The specific
form the the command is similar, except that it lists the port information for
only the specified group.
ProCurve# show ipv6 mld vlan 9 group
MLD Service Protocol Group Info
VLAN ID : 9
VLAN Name : VLAN9
Filtered Group Address : ff02::c
LastReporter:fe80::7061:4b38:dbea:2c4f
ExpiryTime : 0h:2m:19s
Port Port Type | Port Mode ExpiryTime
---- --------- + --------- --------------------
B3 100/1000T | auto
B5 100/1000T | auto
0h:2m:19s
0h:2m:18s
.
.
.
FilteredGroupAddress:ff3e:30:2001:db8:9:0:7:111
Last Reporter : fe80::7061:4b38:dbea:2c4f
ExpiryTime : 0h:4m:14s
Port Port Type | Port Mode ExpiryTime
---- --------- + --------- --------------------
B3 100/1000T | auto
B5 100/1000T | auto
0h:4m:14s
0h:4m:09s
Figure 7-8. Example of Ports Joined to Multicast Groups in a Specific VLAN
7-17
Multicast Listener Discovery (MLD) Snooping
Displaying MLD Status and Configuration
The following information is shown:
■
VLAN ID and name
■
port information for each IPv6 multicast group address in the VLAN
(general group command) or for the specified IPv6 multicast group
address (specific group command):
•
•
•
group multicast address
last reporter: last MLD host to send a join to the group address
group expiry time: the time until the group expires if no further joins
are seen
•
•
•
port name for each port
port type for each port: Ethernet connection type
port mode for each port: auto (follows MLD snooping rules; that is,
packets are forwarded for joined groups), forward (all multicast pack-
ets are forwarded to this group), or blocked (all multicast packets are
dropped, except that packets for well-known addresses are for-
warded)
•
expiry time for each port: amount of time until this port is aged out
of the multicast address group, unless a join is received
Statistics
Syntax: show ipv6 mld statistics
Shows MLD statistics for all MLD-enabled VLANs
Syntax: show ipv6 mld vlan <vid> statistics
Shows MLD statistics for the specified VLAN
vid—VLAN ID
The general form the of the command shows the total number of MLD-enabled
VLANs and a count of multicast groups currently joined. Both forms of the
command show VLAN IDs and names, as well as the number of filtered and
standard multicast groups and the total number of multicast groups.
7-18
Multicast Listener Discovery (MLD) Snooping
Displaying MLD Status and Configuration
For example, the general form of the command:
ProCurve# show ipv6 mld statistics
MLD Service Statistics
Total vlans with MLD enabled
: 2
Current count of multicast groups joined
: 36
MLD Joined Groups Statistics
VLAN ID VLAN NAME
filtered
standard
total
------- ------------ ------------ ------------ ------------
8
9
VLAN8
VLAN9
26
10
0
0
26
10
Figure 7-9. Example of MLD Statistics for All VLANs Configured
And the specific form of the command:
ProCurve# show ipv6 mld vlan 8 statistics
MLD Statistics
VLAN ID : 8
VLAN NAME : VLAN8
Number of Filtered Groups
Number of Standard Groups
: 26
: 0
Total Multicast Groups Joined : 26
Figure 7-10. Example of MLD Statistics for a Single VLAN
7-19
Multicast Listener Discovery (MLD) Snooping
Displaying MLD Status and Configuration
Counters
Syntax: show ipv6 mld vlan <vid> counters
Displays MLD counters for the specified VLAN
vid—VLAN ID
ProCurve# show ipv6 mld vlan 8 counters
MLD Service Vlan Counters
VLAN ID : 8
VLAN NAME : VLAN8
General Query Rx
: 2
General Query Tx
: 0
Group Specific Query Rx
Group Specific Query Tx
V1 Member Report Rx
V2 Member Report Rx
Leave Rx
: 0
: 0
: 1589
: 15
: 30
: 0
Unknown MLD Type Rx
Unknown Pkt Rx
: 0
Forward to Routers Tx Counter
Forward to Vlan Tx Counter
Port Fast Leave Counter
Port Forced Fast Leave Counter
: 83
: 48
: 4
: 0
Port Membership Timeount Counter : 28
Figure 7-11. Example of MLD Counters for a Single VLAN
7-20
Multicast Listener Discovery (MLD) Snooping
Displaying MLD Status and Configuration
The following information is shown:
■
VLAN number and name
For each VLAN:
■
•
•
•
•
•
•
•
•
•
•
•
•
•
•
number of general queries received
number of general queries sent
number of group-specific queries received
number of group-specific queries sent
number of MLD version 1 member reports (joins) received
number of MLD version 2 member reports (joins) received
number of leaves received
number of MLD packets of unknown type received
number of packets of unknown type received
number of packets forwarded to routers on this VLAN
number of times a packet has been forwarded toall ports on this VLAN
number of fast leaves that have occurred
number of forced fast leaves thathave occurred
number of times a join has timed out on this VLAN
7-21
Multicast Listener Discovery (MLD) Snooping
Displaying MLD Status and Configuration
7-22
8
IPv6 Diagnostic and Troubleshooting
Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8-2
ICMP Rate-Limiting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8-2
Ping for IPv6 (Ping6) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8-4
Traceroute for IPv6 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8-6
DNS Resolver for IPv6 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8-9
DNS Configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8-9
Viewing the Current Configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8-11
Operating Notes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8-11
Debug/Syslog for IPv6 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8-12
Configuring Debug and Event Log Messaging . . . . . . . . . . . . . . . . . . . 8-12
Debug Command . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8-13
Configuring Debug Destinations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8-15
Logging Command . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8-16
8-1
IPv6 Diagnostic and Troubleshooting
Introduction
Introduction
Feature
Default
CLI
IPv6 ICMP Message Interval and
Token Bucket
100 ms
10 max tokens
8-3
ping6
Enabled
n/a
traceroute6
The IPv6 ICMP feature enables control over the error and informational
message rate for IPv6 traffic, which can help mitigate the effects of a Denial-
of-service attack. Ping6enablesverification ofaccesstoaspecificIPv6device,
and traceroute6 enables tracing the route to an IPv6-enabled device on the
network.
ICMP Rate-Limiting
ICMP rate-limiting controls the rate at which ICMPv6 generates error and
informational messages for features such as:
■
■
■
■
■
■
■
■
neighbor solicitations
neighbor advertisements
multicast listener discovery (MLD)
path MTU discovery (PMTU)
duplicate address discovery (DAD)
neighbor unreachability detection (NUD)
router discovery
neighbor discovery (NDP)
ICMPv6 error message generation is enabled by default. The rate of message
generation can be adjusted, or message generation can be disabled.
8-2
IPv6 Diagnostic and Troubleshooting
ICMP Rate-Limiting
Controlling the frequency of ICMPv6 error messages can help to prevent DoS
(Denial- of- Service) attacks. With IPv6 enabled on the switch, you can control
the allowable frequency of these messages with ICMPv6 rate-limiting.
Syntax:. ipv6 icmp error-interval < 0 - 2147483647 > [bucket-size < 1 - 200 >]
no ipv6 icmp error-interval
This command is executed from the global configuration level,
and uses a “token bucket” method for limiting the rate of ICMP
error and informational messages. Using this method, each
ICMP message uses one token, and a message can be sent only
if there is a token available. Inthe default configuration, a new
token can be added every 100 milliseconds, and a maximum
of 10 tokens are allowed in the token bucket. If the token bucket
is full, a new token cannot be added until an existing token is
used to enable sending an ICMP message. You can increase or
decrease both the the frequency with which used tokens can be
replaced and (optionally) the number of tokens allowed to
exist.
error-interval: Specifies the time interval in milliseconds
between successive token adds. Increasing this value
decreases the rate at which tokens can be added. A setting
of 0 disables ICMP messaging.
Default: 100; Range: 0 - 2147483647.
bucket-size: This optional keyword specifies the maximum
number of tokens allowed in the token bucket at any time.
Decreasing this value decreases the maximum number of
tokens that may be available at any time.
Default: 10; Range: 1 - 200.
You can change the rate at which ICMP messages are allowed
by changing the error-interval with or without a corre-
sponding change in the bucket-size.
The no ipv6 icmp error-interval command resets both the error-
interval and the bucket-size values to their defaults.
Use the show run command to view the current ICMP error
interval settings.
For example, the following command limits ICMP error and informational
messages to no more than 20 every 1 second:
ProCurve(config)# ipv6 icmp error-interval 1000000 bucket-size
20
8-3
IPv6 Diagnostic and Troubleshooting
Ping for IPv6 (Ping6)
Ping for IPv6 (Ping6)
name to see if an IPv6 switch is communicating properly with another device
on the same or another IP network. A ping test checks the path between the
switch and another device by sending IP packets (ICMP Echo Requests).
To use a ping6 command with an IPv6 host name or fully qualified domain
names, refer to “DNS Resolver for IPv6” on page 8-9.
You can issue single or multiple ping tests with varying repetitions and timeout
periods to wait for a ping reply.
Replies to each ping test are displayed on the console screen. To stop a ping
test before it finishes, press [Ctrl] [C].
For more information about using a ping test, refer to the “Troubleshooting”
appendix in the current Management and Configuration Guide for your
switch.
Syntax: ping6 < ipv6-address | hostname | switch-number >
[repetitions < 1 - 10000 >] [timeout < 1 - 60 >] [data-size < 0 - 65507 >]
[data-fill < 0 - 1024 >]
ping6 <link-local-address%vlan<vid> | hostname | switch-number>
[repetitions < 1 - 10000 >] [timeout < 1 - 60 >] [data-size < 0 - 65507 >]
[data-fill < 0 - 1024 >]
Pings the specified IPv6 host by sending ICMP version 6
(ICMPv6) echo request packets to the specified host.
<ipv6-address>: IPv6 address of a destination host device.
< link-local-address >%vlan<vlan-id>: IPv6 link-local
address, where %vlan<vlan-id> specifies the VLAN ID
number.
< hostname >: Host name of an IPv6 host device configured
on an IPv6 DNS server.
< switch-number >: Number of an IPv6-based switch that is
a member of a switch stack (IPv6 subnet). Valid values: 1 -
16.
[repetitions]: Number of times that IPv6 ping packets are sent
to the destination IPv6 host. Valid values: 1 - 10000. Default:
1.
8-4
IPv6 Diagnostic and Troubleshooting
Ping for IPv6 (Ping6)
[timeout]: Number of seconds within which a response is
required from the destination host before the ping test times
out. Valid values: 1 - 60. Default: 1 second.
[data-size]: Size of data (in bytes) to be sent in ping packets.
Valid values: 0 - 65507. Default: 0.
[data-fill]: Text string used as data in ping packets. You can
enter up to 1024 alphanumeric characters in the text.
Default: 0 (no text is used).
ProCurve# ping6 fe80::2:1%vlan10
fe80:0000:0000:0000:0000:0000:0002:0001 is alive, time = 975 ms
ProCurve# ping6 2001:db8::a:1c:e3:3 repetitions 3
2001:0db8:0000:0000:000a:001c:00e3:0003 is alive, iteration 1, time = 15 ms
2001:0db8:0000:0000:000a:001c:00e3:0003 is alive, iteration 2, time = 15 ms
2001:0db8:0000:0000:000a:001c:00e3:0003 is alive, iteration 3, time = 15 ms
3 packets transmitted, 3 packets received, 0% packet loss
round-trip (ms) min/avg/max = 15/15/15
ProCurve# ping6 2001:db8::214:c2ff:fe4c:e480 repetitions 3 timeout 2
2001:db8:0000:0000:0214:c2ff:fe4c:e480 is alive, iteration 1, time = 15 ms
2001:db8:0000:0000:0214:c2ff:fe4c:e480 is alive, iteration 2, time = 10 ms
2001:db8:0000:0000:0214:c2ff:fe4c:e480 is alive, iteration 3, time = 15 ms
ProCurve# ping6 2001:db8::10
Request timed out.
Figure 8-1. Examples of IPv6 Ping Tests
8-5
IPv6 Diagnostic and Troubleshooting
Traceroute for IPv6
Traceroute for IPv6
host device that is identified by an IPv6 address or IPv6 host name. In the
command output, information on each (router) hop between the switch and
the destination IPv6 address is displayed.
To use a traceroute6 command with an IPv6 host name or fully qualified domain
names, refer to “DNS Resolver for IPv6” on page 8-9.
Note that each time you perform a traceroute operation, the traceroute
command uses the default settings unless you enter different values with each
instance of the command.
Replies to each traceroute operation are displayed on the console screen. To
stop a traceroute operation before it finishes, press [Ctrl] [C].
For more information about how to configure and use a traceroute operation,
refer to the “Troubleshooting” appendix in the Management and Configura-
tion Guide.
8-6
IPv6 Diagnostic and Troubleshooting
Traceroute for IPv6
Syntax: traceroute6 < ipv6-address | hostname >
[minttl < 1-255 > [maxttl < 1-255 > [timeout < 1 - 60 >] [probes < 1-5 >]
traceroute6 <link-local-address%vlan<vid> | hostname >
[minttl < 1-255 >] [maxttl < 1-255 >] [timeout < 1 - 60 >] [probes < 1-5 >]
Displays the IPv6 address of each hop in the route to the
specified destination host device with the time (in
microseconds)requiredforapacketreplytobereceivedfrom
each next-hop device.
<ipv6-address>: IPv6 address of a destination host device.
<link-local-address>%vlan<vlan-id>: IPv6 link-local address,
where %vlan<vlan-id> specifies the VLAN ID number.
<hostname>: Host name of an IPv6 host device configured on
an IPv6 DNS server.
minttl: Minimum number of hops allowed for each probe
packet sent along the route. Default: 1; Range: 1 - 255.
• Iftheminttl valueisgreaterthantheactualnumberofhops,
the traceroute output displays only the hops equal to or
greater than the configured minttl threshold value. The
hops below the threshold value are not displayed.
• If the minttl value is the same as the actual number of hops,
only the final hop is displayed in the command output.
• If the minttl value is less than the actual number of hops,
all hops to the destination host are displayed.
maxttl: Maximum number of hops allowed for each probe
packet sent along the route. Valid values: 1 - 255. Default: 30.
• If the maxttl value is less than the actual number of hops
required to reach the host, the traceroute output displays
only the IPv6 addresses of the hops detected by the
configured maxttl value.
timeout: Number of seconds within which a response is
required from the IPv6 device at each hop in the route to the
destination host before the traceroute operation times out.
Default: 5 seconds; Range: 1 - 60.
probes: Number of times a traceroute is performed to locate
the IPv6 device at any hop in the route to the specified host
before the operation times out. Default: 3; Range: 1 - 5.
8-7
IPv6 Diagnostic and Troubleshooting
Traceroute for IPv6
ProCurve# traceroute6 2001:db8::10
traceroute to 2001:db8::10
1 hop min, 30 hops max, 5 sec. timeout, 3 probes
1 2001:db8::a:1c:e3:3
2 2001:db8:0:7::5
3 2001:db8::214:c2ff:fe4c:e480 0 ms
0 ms
7 ms
0 ms
3 ms
1 ms
1 ms
0 ms
0 ms
0 ms
0 ms
Intermediaterouterhopswith
the time (in milliseconds) for
the switch to receive a
response from each of the
three probes sent to each
router.
4 2001:db8::10
0 ms
Destination IPv6 address
ProCurve# traceroute6 2001:db8::10 maxttl 7
traceroute to fe80::1:2:3:4
1 hop min, 7 hops max, 5 sec. timeout, 3 probes
1
2
3
4
5
6
7
2001:db8::a:1c:e3:3
2001:db8:0:7::5
* 2001:db8::214:c2ff:fe4c:e480 *
* * *
* * *
* * *
* * *
0 ms
0 ms
0 ms
0 ms
0 ms
0 ms
At hop 3, the first and third probes timed
out, but the second probe reached the
router. Each timed-out probe is displayed
with an asterisk (*).
The four remaining probes within the
configured seven-hop maximum (maxttl)
also timed out without finding a next-hop
router or the destination IPv6 address.
Figure 8-2. Examples of IPv6 Traceroute Probes
8-8
IPv6 Diagnostic and Troubleshooting
DNS Resolver for IPv6
DNS Resolver for IPv6
The Domain Name System (DNS) resolver is designed for local network
domains where it enables use of a host name or fully qualified domain name
to support DNS-compatible commands from the switch. Beginning with soft-
ware release K.13.01,DNS operation supports these features:
■
■
■
dual-stack operation: IPv6 and IPv4 DNS resolution
DNS-compatible commands: ping, ping6, traceroute, and traceroute6
multiple, prioritized DNS servers (IPv4 and IPv6)
DNS Configuration
Up to three DNS servers can be configured. The addresses must be prioritized,
and can be for any combination of IPv4 and IPv6 DNS servers.
N o t e
This section describes the commands for configuring DNS operation for IPv6
DNS applications. For further information and examples on using the DNS
feature, refer to “DNS Resolver” in appendix C, “Troubleshooting”, in the
current Management and Configuration Guide for your switch.
Syntax:. [no] ip dns server-address priority < 1 - 3 > < ip-addr >
Used at the global config level to configure the address and
priority of a DNS server. Allows for configuring up to three
servers providing DNS service. (The servers must all be acces-
sible to the switch.) The command allows both IPv4 and IPv6
servers in any combination and any order of priority.
priority < 1 - 3 >: Identifies the order in which the specified DNS
server will be accessed by a DNS resolution attempt. A resolu-
tion attempt tries each configured DNS server address, in
ascending order of priority, until the attempt is successful or
all configured server options have been tried and failed. To
change the priority of an existing server option, you must
remove the option from the switch configuration and re-enter
it with the new priority. If another server address is config-
ured for the new priority, you must also remove that address
from the configuration before re-assigning its priority to
another address.
— Continued on the next page. —
8-9
IPv6 Diagnostic and Troubleshooting
DNS Resolver for IPv6
— Continued from the previous page. —
The no form of the command removes the specified address
from the server address list configured on the switch.
< ip-addr >: Specifies the address of an IPv6 or IPv4 DNS server.
Syntax:. [no] ip dns domain-name < domain-name-suffix >
Used at the global config level to configure the domain suffix
that is automatically appended to the host name entered with
a command supporting DNS operation. Configuring the
domain suffix is optional if you plan to use fully qualified
domain names in all cases instead of just entering host names.
You can configure up to three addresses for DNS servers in the
same or different domains. However, you can configure only
one domain name suffix. This means that a fully qualified
domain name must be used to resolve addresses for hosts that
do not reside in the same domain as the one you configure
with this command. That is, if the domain name suffix and
the address of a DNS server for that same domain are both
configured on the switch, then you need to enter only the host
name of the desired target when executing a command that
supports DNS operation. But if the DNS server used to resolve
the host name for the desired target is in a different domain
thanthedomainconfiguredwiththiscommand, thenyouneed
to enter the fully qualified domain name for the target.
The no form of the command removes the configured domain
name suffix.
For example, suppose you want to configure the following on the switch:
■
the address 2001:db8::127:10 which identifies a DNS server in the domain
named mygroup.procurve.net
■
■
a priority of 1 for the above server
the domain suffix mygroup.procurve.net
Assume that the above, configured DNS server supports an IPv6 device having
a host name of “mars-1” (and an IPv6 address of fe80::215:60ff:fe7a:adc0) in
the “mygroup.procurve.net” domain. In this case you can use the device's host
name alone to ping the device because the mygroup.procurve.net domain has
8-10
IPv6 Diagnostic and Troubleshooting
DNS Resolver for IPv6
been configured as the domain name on the switch and the address of a DNS
server residing in that domain is also configured on the switch. The commands
for these steps are as follows:
ProCurve(config)# ip dns server priority 1 2001:db8::127:10
ProCurve(config)# ip dns domain-name mygroup.procurve.net
ProCurve(config)# ping6 mars-1
fe80::215:60ff:fe7a:adc0 is alive, time = 1 ms
Figure 8-1. Example of Configuring for a Local DNS Server and Pinging a Registered Device
However, for the same “mars-1” device, if mygroup.procurve.net was not the
configured domain name, you would have to use the fully qualified domain
name for the device named mars-1:
ProCurve# ping6 mars-1.mygroup.procurve.net
For further information and examples on using the DNS feature, refer to “DNS
Resolver” in appendix C, “Troubleshooting”, in the current Management and
Configuration Guide for your switch.
Viewing the Current Configuration
Use the show ip dns command to view the current DNS server configuration.
Use the show run command to view both the current DNS server addresses
and the current DNS domain name in the active configuration.
Operating Notes
In software release K.13.01, DNS addressing is not configurable from a
DHCPv6 server.
8-11
IPv6 Diagnostic and Troubleshooting
Debug/Syslog for IPv6
Debug/Syslog for IPv6
The Debug/System logging (Syslog) for IPv6 feature provides the same logging
functions as the IPv4 version, allowing you to record IPv4 and IPv6 Event Log
and debug messages on a remote device to troubleshoot switch or network
operation. For example, you can send messages about routing misconfigura-
tions and other network protocol details to an external device, and later use
them to debug network-level problems.
Configuring Debug and Event Log Messaging
To specify the types of debug and Event Log messages that you want to send
to an external device:
■
Use the debug < debug-type > command to send messaging reports for the
following types of switch events:
•
•
•
•
•
•
•
ACL “deny” matches
DHCP snooping events
Dynamic ARP protection events
Events recorded in the switch’s Event Log
IPv4 OSPF and RIP routing events
IPv6 DHCPv6 client and Neighbor Discovery events
LLDP events
■
Use the logging < severity severity-level | system-module system-module>
command to select a subset of Event Log messages to send to an external
device for debugging purposes according to:
•
•
Severity level
System module
8-12
IPv6 Diagnostic and Troubleshooting
Debug/Syslog for IPv6
Debug Command
Syntax: [no] debug < debug-type >
Configures the types of IPv4 and IPv6 messages that are sent to
Syslog servers or other debug destinations, where <debug-type > is
any of the following event types:
acl
When a match occurs on an ACL “deny” statement with a
log parameter, an ACL message is sent to configured debug
destinations. (Default: Disabled - ACL messages for traffic
that matches “deny” entries are not sent.)
all
Configures all IPv4 and IPv6 debug message types to be sent
to configured Idebug destinations. (Default: Disabled - No
debug messages are sent.)
arp-protect
Configures messages for Dynamic ARP Protection events to
besent toconfigured debugdestinations. (Default:Disabled
- No debug messages are sent.)
event
Configures Event Log messages to be sent to configured
debug destinations.
Event Log messages are enabled to be automatically sent to
debug destinations in the following conditions:
• If no Syslog server address is configured and you enter
the logging command to configure a destination address.
• If at least one Syslog server address is configured in the
startup configuration and the switch is rebooted or reset.
Event log messages are the default type of debug message
sent to configured debug destinations.
ip
Configures IPv4 OSPF and RIP routing messages to be sent
to configured debug destinations.
8-13
IPv6 Diagnostic and Troubleshooting
Debug/Syslog for IPv6
Syntax:. [no] debug < debug-type > (Continued)
ip [ ospf < adj | event | flood | lsa-generation | packet | retransmission
| spf > ]
Configures specified IPv4 OSPF message types to be sent to
configured debug destinations:
adj — Adjacency changes.
event — OSPF events.
flood — Information on flood messages.
lsa-generation — New LSAs added to database.
packet — Packets sent/received.
retransmission — Retransmission timer messages.
spf — Path recalculation messages
ip [ rip < database | event | trigger > ]
Configures specified IPv4 RIP message types to be sent to
configured debug destinations:
database— Database changes
event— RIP events
trigger— Trigger messages
ipv6
Configures messages for IPv6 DHCPv6 client and neighbor
discovery events to be sent to configured debug destina-
tions.
ipv6 [ dhcpv6-client <events | packets> | nd ]
Configures one of the following IPv6 message types to be
sent to configured debug destinations:
dhcpv6-clients events — DHCPv6 client events
dhcpv6-clients packets — Statistics on DHCPv6 packets
transmitted on a switch configured as a DHCPv6 client
nd— Events during IPv6 neighbor discovery
lldp
Configures all LLDP message types to be sent to configured
debug destinations.
wireless-services
Configures messages about the operation of wireless-ser-
vices modules to be sent to configured debug destinations.
8-14
IPv6 Diagnostic and Troubleshooting
Debug/Syslog for IPv6
Configuring Debug Destinations
ADebug/Syslogdestinationdevice canbe aSyslog server (uptosixmaximum)
and/or a console session:
■
Use the debug destination < logging | session | buffer > command to enable
(and disable) Syslog messaging on a Syslog server or to a CLI session for
the debug message types configured with the debug and logging com-
mands (see “Configuring Debug and Event Log Messaging” on page 8-12):
•
debug destination logging enables the configured debug message types
to be sent to Syslog servers configured with the logging command.
•
debug destination session enables the configured debug message types
to be sent to the CLI session that executed this command. The session
can be on any one terminal emulation device with serial, Telnet, or
SSH access to the CLI at the Manager level prompt.
•
debug destination buffer enables the configured debug message types
to be sent to a buffer in switch memory.
8-15
IPv6 Diagnostic and Troubleshooting
Debug/Syslog for IPv6
Logging Command
Syntax: [no] logging < syslog-ipv4-addr >
Enables or disables Syslog messaging to the specified IPv4
address. You can configure up to six addresses. If you config-
ure an address when none are already configured, this com-
mand enables destination logging (Syslog) and the Event
debug type. Therefore, at a minimum, the switch begins send-
ing Event Log messages to configured Syslog servers. If other
debug message types are configured, they are also sent to the
Syslog server.
no logging removes all currently configured Syslog logging
destinations from the running configuration.
no logging < syslog-ipv4-address > removes only the specified
Syslog logging destination from the running configuration.
Note: The no logging command does not delete the Syslog server
addresses stored in the startup configuration. To delete Syslog
addresses in the startup configuration, you must enter the
no logging command followed by the write memory command. To
verify the deletion of a Syslog server address, display the
startup configuration by entering the show config command.
To block the messages sent to configured Syslog servers from
the currently configured debug message type, enter the no debug
< debug-type > command.
To disable Syslog logging on the switch without deleting con-
figured server addresses, enter the no debug destination logging
command.
For complete information on how to configure a Syslog server and Debug/
Syslog message reports, refer to the “Troubleshooting” appendix in the Man-
agement and Configuration Guide.
8-16
A
Terminology
DAD Duplicate Address Detection. Refer to “Duplicate Address Detection (DAD)”
on page 4-18.
bits forming 212:79ff:fe88:a100 comprise the device identifier.
DoS Denial-of-Service.
EUI-64 Extended Unique Identifier. Refer to “Extended Unique Identifier (EUI)” on
page 3-14.
Manual Address Configures an IPv6 address by using the CLI to manually enter a static address.
Configuration Referred to as “Static Address Configuration” in this guide. See Static
Address Configuration, below.
Discovery (MLD) Snooping”.
or device. Refer to “Path MTU (PMTU) Discovery” on page 2-16.
RA Router Advertisement. Refer to “Router Advertisements” on page 4-27.
SLAAC Stateless Address Autoconfiguration. Refer to “SLAAC (Stateless Automatic
Address Configuration)” on page 2-7.
Static Address A permanently configured IPv6 address, as opposed to an autoconfigured
address.
Static Address Configures an IPv6 address by using the CLI to manually enter the address
Configuration instead of using an automatically generated or DHCPv6-assigned address.
Same as “Manual Address Configuration”. See also Manual Address Config-
uration, above.
1
Terminology
2
Index
authorized IP managers
Symbols
… 4-7, 4-13
configuration examples … 6-8, 6-13
feature description … 6-3
IP masks used to configure multiple
A
ACL
multiple IPv6 addresses on an interface … 3-3,
3-5, 3-9
neighbor discovery for IPv6 … 2-14
network prefix in IPv6 address … 3-4
precedence among security settings … 6-4
effect of static address … 4-14
autorun
TFTP download of key file … 5-17
TFTP download of trusted certificate … 5-17
downloading software images … 5-19
for IPv6 … 5-19
B
command file
TFTP download and running command
script … 5-17
command output
TFTP upload on remote device … 5-18
command syntax conventions … 1-2
configuration file
TFTP download … 5-17
TFTP upload on remote device … 5-18
copy
deprecation … 4-32
in IPv6 … 2-9
IPv6 address … 3-10, 3-20
IPv6 address configuration … 4-14
preferred lifetime … 4-32
valid lifetime … 4-32
ARP protection
debug messages … 8-13
TFTP transfers … 5-15
Index – 1
crash data file
crash log
timep server … 2-8
for IPv6 … 2-14
D
DAD
documentation
detecting duplicate unicast addresses … 3-6,
performed on all IPv6 unicast addresses … 4-20
latest versions … 1-2, 1-4, 1-6
sources for more information … 1-4
switching IPv4 and IPv6 traffic on same
VLAN … 2-3, 2-4, 3-6
using DHCPv6 … 3-8
debug
See DAD.
forIPv6 … 8-12
IPv6 event types supported … 8-12
event log
compared to debug/Syslog operation … 8-12
debug messages … 8-13
OSPF messages … 8-14
RIP messages … 8-14
debugging by severity level … 8-12
debugging by system module … 8-12
IPv6 support … 2-14
wireless-services messages … 8-14
denial-of-service
DHCPv6
See EUI.
fast leave
MLD configuration … 7-10, 7-11
used in MLD snooping … 7-7
3-19
DHCP relay for IPv6 … 3-8
link-local address prefix … 3-11, 4-6
FE80, link-local address
autoconfiguration … 2-7, 3-9, 3-13, 3-14
FF, IPv6 multicast address prefix … 3-12
flow sampling … 5-20
mutually exclusive with static global unicast
address … 4-11
NTP server … 2-8
precedence over autoconfig address … 4-11
server-assigned global unicast address … 2-8,
3-5, 3-6, 3-8, 4-9
2 – Index
DAD … 4-18
debug … 8-12
G
gateway
deprecation … 3-16, 4-32
device identifier … 3-18
leading 2 in prefix … 3-12
manual configuration … 2-8, 3-5, 3-9, 3-17, 4-13
disabling … 4-16
3-5, 3-11, 3-16, 4-7
loopback address … 2-15, 3-24
migrating from IPv4 … 2-3, 2-4
I
ICMP
error-interval … 8-3
for IPv6 … 2-13
inform messages … 5-20
in IPv6 address
IP authorized managers
IP masks
for multiple authorized manager stations … 6-6
used in configuring authorized IP management
See MLD.
ping6 … 2-11, 2-13
planning an addressing scheme … 3-6
restrictions … 2-15
configuring … 5-23
for IPv6 … 2-11
IPv6
address format … 3-3
anycast address … 2-9, 3-10, 3-20, 4-14, 5-2
benefits … 2-6
routing between different VLANs … 4-27
security features … 2-11
selecting default router on a VLAN … 4-28
command index … -xiii
Index – 3
single IPv6 link-local address on an
network prefix … 3-4
See SNTP server.
SSHv2 … 2-11
debug messages … 8-14
local unicast address
network prefix … 3-4
See also SSH.
logging command
VLAN … 2-3
syntax … 8-12
telnet6 … 5-6
used in IPv6 link-local autoconfiguration … 2-7,
manual address configuration
masks
TFTP … 2-10
See IP masks.
See MTU.
Timep
MIB support
SNMP … 5-20
troubleshooting
displaying statistics … 7-18, 7-20
tunneling … 2-5
unique local unicast address … 3-11, 3-19
unspecified address … 3-25
reducing multicast flooding … 7-2, 7-4
snooping at port level … 7-2
MTU
when to use different address types … 3-7
See also MLD.
for IPv6 … 2-16
IPv6 address
binary expression … 6-7, 6-11
IPv6 interface identifier
IPv6 address format … 3-22
IPv6 network prefix … 3-4, 3-12
IPv6 solicited-node group … 3-21, 3-23
IPv6 traffic … 2-9
L
link-local address
autoconfiguration … 2-7, 3-5, 3-11, 3-13, 4-6
autoconfiguration using EUI … 3-14
manual configuration … 2-8, 3-5, 3-9, 4-12
MLD snooping reduces multicast flooding … 7-2,
7-4
Multicast Listener Discovery
4 – Index
See MLD.
3-8, 4-9
N
neighbor cache, view … 5-3
neighbor discovery
neighbor solicitations
IPv6 global unicast address deprecation … 3-16,
used in duplicate address detection … 4-19
neighbor, clear cache … 5-2
notifications
supported in IPv6 … 5-20
NTP server … 2-8
maximum number of IPv6 routes … 2-15
RIP debug messages … 8-14
selecting default IPv6 router … 4-28
switching IPv6 traffic on different VLANs … 2-4
traceroute … 8-6
O
OSPF
debug messages … 8-14
running-config
P
ping6 … 2-13, 8-4
port
See SCP/SFTP.
port-level MLD snooping … 7-2, 7-9
preferred lifetime … 4-22
4-12
use of IPv6 address as source or
destination … 4-32
priority
SCP/SFTP
secure file transfer
session limit … 6-18
See SCP/SFTP.
secure FTP
See SCP/SFTP.
security
for IPv6 … 2-11
public-key file
IPv6 authorized managers … 2-12
settings … 6-4
R
RIP
sFlow … 5-20
SFTP
See SCP/SFTP.
show ipv6 … 2-9, 3-6, 4-6, 4-8, 4-10, 4-13, 4-15, 4-21
show run
debug messages … 8-14
router advertisements
used in IPv6 … 4-27
routing
IPv6 output … 4-25
SNMP
determining an IPv6 gateway … 2-8
DHCPv6 debug messages … 8-14
configuring SNMPv1/v2c trap receiver … 5-21
Index – 5
for IPv6 … 8-12
IPv6 support … 2-15
Telnet
SNMPv1 and v2c traps … 5-20
SNTP
mode … 5-11
uploading crash log … 5-18
view configuration … 5-11
IPv6 address
priority
SNTPv6 … 2-10
software image
solicited-node
TFTP6
IPv6 multicast address group … 3-21, 3-23
SSH
copy command … 5-15, 5-17
enable client or server … 5-16
timep server … 2-8
manual configuration … 5-13
traceroute … 8-6
for IPv6 … 2-11
overview … 6-15
startup-config
TFTP download … 5-18
TFTP upload on remote device … 5-18
stateless automatic address configuration … 2-7
subnetting
for IPv6 … 2-13
in IPv6 … 3-3, 3-5, 3-9
traceroute6 … 8-6
traffic monitoring
suffix, link-local address … 5-6, 5-10, 5-13
Syslog
sFlow … 5-20
traps
compared to event log … 8-12
event log messages sent by default … 8-16
6 – Index
maximum number of IPv6 addresses … 2-15
neighbor discovery operation … 4-17
selecting default IPv6 router … 4-28
traceroute6 … 2-13
using CLI session … 8-15
using ICMPv6 … 2-13
using IPv6 loopback address … 2-15
using Syslog servers … 8-12
switching IPv6 traffic between different
VLANs … 2-3
unique local unicast address
configuration … 3-11
using an external router … 2-4
U
unicast
IPv6 address … 3-10
W
unique local unicast address
autoconfiguration … 3-11
unspecified address
See also web browser interface.
web browser interface
IPv6 support … 2-11
in IPv6 … 3-25
V
debug messages … 8-14
valid lifetime
of global unicast address … 3-7, 3-25, 4-8, 4-10
destination … 4-32
VLAN
configuration … 2-8, 3-5, 3-9, 3-17, 4-13
global unicast address prefix … 3-12
IPv6 link-local address autoconfiguration … 4-6
IPv6 multicast solicited-node group … 3-21
link-local address autoconfiguration … 2-7, 3-5,
3-13, 3-14, 4-6
Index – 7
© Copyright 2008 Hewlett-Packard
Development Company, L.P.
January 2008
Manual Part Number
5992-3067
|