Dual stack multi-home BGP

Question

I have a design I'm working on which will require among other things dual stack across MPLS. Configuring CE routers for dual stack seems very straight forward, however I'm having trouble finding documentation describing the BGP config for multihoming and load sharing with 2 routers and 2 service providers. I've configured this quite a few times with HSRP and BGP for IPv4 similar to this example:
http://www.cisco.com/en/US/tech/tk365/technologies_configuration_example09186a00800945bf.shtml#conf5
Am I looking at this wrong or are these scenarios just not widely published yet?
Any help is greatly appreciated!
thanks,
Josh

Answer 1

Hi Josh,
You will have to understand the MBGP address families. One of the basic rule of MBGP is that when I'm advertising a route from a specific address family, the next hop has to be from the same address family. So, you will have to make sure the next hop is from the same address family. Couple of examples for you:
1. IPv6 NLRI in IPv4
router bgp 201
bgp router-id 192.168.30.1
neighbor 150.1.1.2 remote-as 301
address-family ipv6
neighbor 150.1.1.2 activate
neighbor 150.1.1.2 route-map SETNH out
network 2192:10::/48
route-map SETNH permit 10
set ipv6 next-hop 2150:1:1::3
2. IPv4 NLRI in IPv6
router bgp 201
bgp router-id 192.168.30.1
neighbor 2150:1:1::2 remote-as 301
address-family ipv4
neighbor 2150:1:1::2 activate
neighbor 2150:1:1::2 route-map SETNH out
network 192.10.0.0
route-map SETNH permit 10
set ip next-hop 150.1.1.3
I also came across this document which should help you: http://fengnet.com/book/Cisco.IOS.Cookbook.2nd/I_0596527225_CHP_25_SECT_11.html
Regards,
Salman