Cisco Systems 2960-S, 2960 Configuring IPv6 Addressing and Enabling IPv6 Host

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Catalyst 2960 and 2960-S Switch Software Configuration Guide

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Chapter 35 Configuring IPv6 Host Functions

Configuring IPv6

Configuring IPv6 Addressing and Enabling IPv6 Host

This section describes how to assign IPv6 addresses to individual Layer 3 inte rfaces and to globally

forward IPv6 traffic on the switch.

Before configuring IPv6 on the switch, consider these guidelines:

• Be sure to select a dual IPv4 and IPv6 SDM template.

• In the ipv6 address interface configuration command, you must enter the ipv6-address and

ipv6-prefix variables with the address specified in hexadecimal using 16-bit values between colons.

The prefix-length variable (preceded by a slash [/]) is a decimal value that shows how many of the

high-order contiguous bits of the address comprise the prefix (the ne twork portion of the address).

To forward IPv6 traffic on an interface, you must configure a global IPv6 address on that interface.

Configuring an IPv6 address on an interface automatically configures a link-local address and activates

IPv6 for the interface. The configured interface automatically joins these required multicast groups for

that link:

• solicited-node multicast group FF02:0:0:0:0:1:ff00::/104 for each unicast address assigned to the

interface (this address is used in the neighbor discovery process.)

• all-nodes link-local multicast group FF02::1

• all-routers link-local multicast group FF02::2

For more information about configuring IPv6, see the “Implementing Addressing and Basic

Connectivity for IPv6” chapter in the Cisco IOS IPv6 Configuration Library on Cisco.com.

Beginning in privileged EXEC mode, follow these steps to assign an IPv6 address to a Layer 3 interface

and enable IPv6forwarding:

Command Purpose

Step 1 configure terminal Enter global configuration mode.

Step 2 sdm prefer dual-ipv4-and-ipv6 default Select the SDM template that supports IPv4 and IPv6.

Step 3 end Return to privileged EXEC mode.

Step 4 reload Reload the operating system.

Step 5 configure terminal Enter global configuration mode after the switch reloads.

Step 6 interface interface-id Enter interface configuration mode, and specify the interface to

configure.

Step 7 ipv6 address ipv6-prefix/prefix length eui-64

ipv6 address ipv6-address link-local

ipv6 enable

Specify a global IPv6 address with an extended unique identifier

(EUI) in the low-order 64 bits of the IPv6 address. Specify only

the network prefix; the last 64 bits are automatically computed

from the switch MAC address. This enables IPv6 processing on

the interface.

Specify a link-local address on the interface to be used instead

of the link-local address that is automatically configured when

IPv6 is enabled on the interface. This command enables IPv6

processing on the interface.

Automatically configure an IPv6 link-local address on the

interface, and enable the interface for IPv6 processing. The

link-local address can only be used to communicate with nodes

on the same link.