Configure IPv6 on a Cisco router

By default, the IPv6 routing is not enabled on Cisco routers. There are several methods for configuring IPv6 addresses on a router. We will assign a global IPv6 address to the interface using the EUI-64 option. A link local address will then be created automatically.

Here are the steps:

  • enable IPv6 routing on a Cisco router using the ipv6 unicast-routing global configuration command.
  • configure an IPv6 global unicast address on an interface using the ipv6 address ADDRESS/PREFIX_LENGTH eui-64 command.

Here is an example IPv6 configuration:

configure ipv6 address cisco router

A link local address will be created automatically. To verify IPv6 addressing, we can use the show ipv6 interface fa0/0 command:

show ipv6 interface command

From the command output we can verify two things:

1. the link local IPv6 address has indeed been automatically configured.
2. the global IPv6 address has been created using the modified EUI-64 method (using the MAC address of the interface – 0050.0fdc.0401).

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