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Cisco IOS Cookbook, 2nd Edition by Ian Brown, Kevin Dooley

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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)# ...

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