Cisco 300 Series Cli Manual page 1020

Stackable managed switches

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IPv6 Tunnel Commands

OL-32830-01 Command Line Interface Reference Guide

isatap—(Optional) Specifies IPv6 automatic tunneling mode as ISATAP to

connect IPv6 nodes (hosts and routers) within IPv4 networks.

Default Configuration

IPv6 tunnel interfaces are not configured.

Command Mode

Interface (Tunnel) Configuration mode

User Guidelines

IPv6 tunneling consists of encapsulating IPv6 packets within IPv4 packets for

transmission across an IPv4 routing infrastructure.

The IPv6 interface is automatically enabled on a tunnel when it is configured as an

IPv6 tunnel by the tunnel mode ipv6ip command and the local IPv4 is defined by

the tunnel source command.

The IPv6 interface on an IPv6 tunnel is disabled if the tunnel stops to be an IPv6

tunnel or the tunnel local IPv4 address is removed and the new IPv4 cannot be

ISATAP Tunnels

Using this command with the isatap keyword specifies an automatic ISATAP

tunnel. ISATAP tunnels enable transport of IPv6 packets within network

boundaries. ISATAP tunnels allow individual IPv4/IPv6 dual-stack hosts within a

site to connect to an IPv6 network using the IPv4 infrastructure.

ISATAP IPv6 addresses can use any initial Unicast /48 prefix. The final 64 bits are

an interface identifier. Of these, the leading 32 bits are the fixed pattern 0000:5EFE;

the last 32 bits carry the tunnel endpoint IPv4 address.

Only the ipv6 address eui-64 command can be used to configured a global unicast

IPv6 on an ISATAP tunnel.

Example 1—The following example configures an ISATAP tunnel:

switchxxxxxx(config)#

switchxxxxxx(config-if)#

interface vlan 1

ip address 1.1.1.1 255.255.255.0