Cisco IOS Cookbook, 2nd Edition

Dynamic Routing with MBGP

Problem

You want to use MBGP to carry IPv6 routing information between autonomous systems.

Solution

MBGP readily carries IPv6 unicast routing information between IPv6 BGP peers:

Router1#configure terminal
Enter configuration commands, one per line.  End with CNTL/Z.
Router1(config)#router bgp 65520
Router1(config-router)#no bgp default ipv4-unicast
Router1(config-router)#neighbor AAAA:5::2 remote-as 65522
Router1(config-router)#neighbor AAAA:5::AA9 remote-as 65521
Router1(config-router)#address-family ipv6
Router1(config-router-af)#neighbor AAAA:5::2 activate
Router1(config-router-af)#neighbor AAAA:5::AA9 activate
Router1(config-router-af)#network AAAA:2222::2/64
Router1(config-router-af)#no synchronization
Router1(config-router-af)#exit-address-family
Router1(config-router)#exit
Router1(config)#end
Router1#

And you can even run a combination of IPv4 and IPv6 BGP on the same router:

Router9#configure terminal
Enter configuration commands, one per line.  End with CNTL/Z.
Router9(config)#router bgp 65521
Router9(config-router)#no bgp default ipv4-unicast
Router9(config-router)#neighbor AAAA:5::1 remote-as 65520
Router9(config-router)#neighbor 192.168.1.103 remote-as 65525
Router9(config-router)#address-family ipv4
Router9(config-router-af)#redistribute connected
Router9(config-router-af)#neighbor 192.168.1.103 activate
Router9(config-router-af)#no auto-summary
Router9(config-router-af)#no synchronization
Router9(config-router-af)#exit-address-family Router9(config-router)# ...