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Advertising IPv4 Routes Between IPv6 BGP Peers

When an IPv6 network connects two separate IPv4 networks, you can use IPv6 to advertise the IPv4 routes over the BGP session, using TCP IPv6 as the transport mechanism. Similarly, you can advertise IPv6 routes between two IPv4 peers over their BGP session.

Configure the peers by using IPv6 addresses within the IPv4 unicast address family. You can set the IPv4 next hop with a static route or by configuring an inbound or outbound route map. This action overrides the IPv4 next hop that is advertised to the peer for IPv4 routes over BGP IPv6 peers.

If you do not use the route map, then the advertised IPv4 next hop is set to the BGP router ID. That value generally makes the next hop unreachable by the other BGP IPv6 peer.



host1(config)#router bgp 100 

host1(config-router)#neighbor 21:1 remote-as
200 

host1(config-router)#route-map my-v4-nexthop 

host1(config-router)#set ip next-hop 10.13.5.1 

host1(config-router)#address-family ipv4 unicast 

host1(config-router-af)#neighbor 21:1 activate 

host1(config-router-af)#neighbor 21:1 route-map
my-v4-nexthop out

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