VRF announcement via E-BGP

tolga.kulaber · ‎03-12-2020

Hi everyone,

There are 2 different VRFs behind the Core-1 and Core-2 devices. In total, I want to announce these 4 VRF routes by running external BGP on Core-1 and Core-2 devices. It was run with internal bgp in some forums, we want to run with external bgp. we couldn't solve it, can you help me?
You can find the configurations of topology and core devices in the appendix.

CORE-2#sh ip bgp vpnv4 all
BGP table version is 148, local router ID is 3.3.3.3
Status codes: s suppressed, d damped, h history, * valid, > best, i - internal,
r RIB-failure, S Stale, m multipath, b backup-path, f RT-Filter,
x best-external, a additional-path, c RIB-compressed,
Origin codes: i - IGP, e - EGP, ? - incomplete
RPKI validation codes: V valid, I invalid, N Not found

Network Next Hop Metric LocPrf Weight Path
Route Distinguisher: 65000:30
*> 10.30.0.0/24 10.254.254.18 20 32768 ?
*> 10.40.0.0/24 10.254.254.18 20 32768 ?
*> 10.254.254.16/30 0.0.0.0 0 32768 ?
*> 172.16.20.0/24 10.254.254.22 20 32768 ?
Route Distinguisher: 65000:40
*> 10.0.222.0/24 10.254.254.22 20 32768 ?
*> 10.40.0.0/24 10.254.254.18 20 32768 ?
*> 10.254.254.20/30 0.0.0.0 0 32768 ?
*> 172.16.20.0/24 10.254.254.22 20 32768 ?

CORE-1#sh ip bgp vpnv4 all
BGP table version is 28, local router ID is 5.5.5.5
Status codes: s suppressed, d damped, h history, * valid, > best, i - internal,
r RIB-failure, S Stale, m multipath, b backup-path, f RT-Filter,
x best-external, a additional-path, c RIB-compressed,
Origin codes: i - IGP, e - EGP, ? - incomplete
RPKI validation codes: V valid, I invalid, N Not found

Network Next Hop Metric LocPrf Weight Path
Route Distinguisher: 65000:10 (default for vrf CustA)
*> 10.10.0.0/24 10.254.254.2 20 32768 ?
*> 10.10.1.0/24 10.254.254.6 20 32768 ?
*> 10.20.0.0/24 10.254.254.2 20 32768 ?
*> 10.254.254.0/30 0.0.0.0 0 32768 ?
Route Distinguisher: 65000:20 (default for vrf CustB)
*> 10.10.1.0/24 10.254.254.6 20 32768 ?
*> 10.20.0.0/24 10.254.254.2 20 32768 ?
*> 10.254.254.4/30 0.0.0.0 0 32768 ?
*> 172.16.10.0/24 10.254.254.6 20 32768 ?

Cristian Matei · ‎03-12-2020

Hi,

You're looking for Inter-AS MPLS, were multiple design and deployment options are available (A, B, AB), based on what you're trying to achieve. Here's a very good example for Option A:

https://www.cisco.com/c/en/us/support/docs/multiprotocol-label-switching-mpls/mpls/200557-Configuration-and-Verification-of-Layer.html

Regards,

Cristian Matei.

tolga.kulaber · ‎03-12-2020

Hi Cristian,
Thank you for this nice information.
Is it possible to provide this structure without route reflector?