6rd Configuration Example

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6rd is a IPv6 transitioning mechanism to allow for stateless tunneling of IPv6 over IPv4. It is intended as a mechanism to tunnel across an ISP's IPv4 only access network.

This example shows the configuration of a 6rd Border Relay (BR) and the configuration of the corresponding 6rd Customer Edge (CE) router. 6rd is specified in RFC5969.


6rd topology.png



ipv6 general-prefix DELEGATED_PREFIX 6rd Tunnel0
interface Loopback0
ip address
interface Tunnel0
tunnel source Loopback0
tunnel mode ipv6ip 6rd
tunnel 6rd ipv4 prefix-len 8
tunnel 6rd prefix 2001:db80::/32
ipv6 address DELEGATED_PREFIX::/128 anycast
ipv6 route 2001:db80::/28 Tunnel0
ipv6 route 2001:db80:0:100::/56 Null0


ipv6 general-prefix DELEGATED_PREFIX6rd Tunnel0
interface Dialer0
ip address dhcp  ! (
interface Tunnel0
tunnel source Dialer0
tunnel mode ipv6ip 6rd
tunnel 6rd ipv4 prefix-len 8
tunnel 6rd prefix 2001:db80::/28
tunnel 6rd br
ipv6 address DELEGATED_PREFIX ::/128 anycast
interface Ethernet0
ipv6 address DELEGATED_PREFIX ::/64 eui-64
ipv6 route 2001:db80::/28 Tunnel0
ipv6 route ::/0 Tunnel0, 2001:db80:a000:0010::
ipv6 route 2001:db80:0:A00::/56 Null0

Related show Commands

This section provides information you can use to confirm your configuration is working properly.

Certain show commands are supported by the Output Interpreter Tool (registered customers only), which allows you to view an analysis of show command output.

Show running-config

Related Information

Technical Support & Documentation - Cisco Systems

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