[c-nsp] Peering between VRF's in the same 6500 VSS

Robert Blayzor rblayzor.bulk at inoc.net
Fri Oct 4 08:35:04 EDT 2013

On Oct 4, 2013, at 5:09 AM, Alexander Wågberg <alex.wagberg at gmail.com> wrote:
> ASR1002X -- VRF-A -- 6500 -- IPS -- 6500 -- VRF-B -- ASR1002X
> The ASR1002X to the left is the same as the one to the right, as well as
> the 6500. The IPS in this picture acts like a "loop cable". Between the
> vrf's I've setup a BGP-peer, the goal is that traffic should flow though
> the IPS when going from vrf A to B and B to A.
> The problem is that, prefixes sent from the ASR in both VRF's are not
> learned in the other vrf on the ASR. The 6500 learns routes from both vrf's
> and announce routes to the ASR in both vrf's. The ASR is also
> route-reflector-client for both vrf's.
> Why can't I see routes from vrf B in vrf A in the ASR ?

If you the 6500's and the ASR's are in different AS's, you'll either have to "as-override" on the 6500's or "allowas-in" on the ASR1002 side.  More than likely the loop prevention in BGP is seeing the same originating AS and dropping the prefixes.

Robert Blayzor
rblayzor at inoc.net

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