BGP IPv6

[Steven4699]

Hi, Guys,

I'm facing a problem on BGP with IPv6 family unicast, Router A with IOS-XR and Router B has established the BGP IPv6 neighbor but they're not able to advertise the prefixs(IPv6 address of loopback 0) to each other.

BTW, they're not in the same AS so the neighbor relation is EBGP for IPv6 unicast!

Any help will be appreciate!

[balaji.bandi]

Can you post the sample configuration to understand what the environment?

[Steven4699]

Yes, sure, here it is

Router A

router bgp 1

bgp router-id 1.1.1.1
address-family ipv6 unicast
network 2001:172::1/128 (loopback 0)
!
neighbor 2001:12::2
remote-as 2
address-family ipv6 unicast

Router B

router bgp 2
bgp router-id 2.2.2.2
no bgp default ipv4-unicast
neighbor 2001:12::1 remote-as 1
!
address-family ipv6

network 2001:192::1/128 (loopback 0)
neighbor 2001:12::1 activate
exit-address-family

Just a simple topology for testing, neighbor is up and Router B can advertise the IPv6 prefix to Router A, but Router A(IOS-XR) always can't advertise/receive the route to/from Router B...

Thanks and have a good day!

[smilstea · Accepted solution]

For eBGP in XR you always need a route-policy for ingress and egress under the neighbor address family configured.

If you want to pass all prefixes you can have a route-policy like below:

route-policy PASS

 pass

end-policy

neighbor 2001:12::2
remote-as 2
address-family ipv6 unicast

route-policy PASS in

route-policy PASS out

Sam

[Steven4699]

OMG! yeah you're right, now it works! Thanks a lot, buddy!