eBGP from a vrf to a neighbor ipv4 in global

[gautamanish]

Hi 

i am trying to establish a ebgp from a vrf loopback towards a peer ip which is in global routing table and is being imported in vrf using following command 

import from default-vrf route-policy <route-policy-name>

ping is happening but bgp is not coming up .

is it possible to establish bgp using source as interface in a vrf towards a interface on other box reachable through global routing table ?

[MHM Cisco World]

I dont know about XR/XE but for IOS YES you can config under VRF source of bgp. 

[gautamanish]

Hi MHM
Thanks for your reply
My query is bgp peering from a source ip in vrf to peer ip reachable through global routing table

Under vrf we are using following to import peer IP address

Vrf
Import from default-vrf route-policy

[MHM Cisco World]

R1-R2 
R1 using VRF <X> to connect to R2 using global 
R2 dont care about the VRF, VRF is locally known, what is important is 
1- R1 VRF can reach the R2 
2- R2 can reach R1 VRF LO 

with IOS you can use under the IPV4 VRF the BGP update source which is LO which config with VRF <X>
this make BGP using LO VRF <X> to establish BGP session with R2.

are you run only IPV4 or there are other address family ?

[gautamanish]

Hi

thanks , yes we will be doing the same for ipv6 also

[Harold Ritter]

Hi @gautamanish ,

It is indeed possible, but you need to make sure the global routing table also has a route to the loopback interface sitting in the VRF. Try adding a static route in the global with the loopback interface as the destination.

ip route <loopback interface ip address in the VRF> 255.255.255.255 Loopback X

Also bear in mind that routes advertised via that BGP session will need to be exported from the VRF to the global.

Regards,