[c-nsp] Filtering OSPF routes from MPBGP to BGP speaker in the same VRF

[Jason Lixfeld]

Hi folks,

I'm wondering if anyone has some ideas they an share on this.

Assume the following:

- CE1 is speaking *iBGP and OSPF to PE1 inside vrf foo
- PE1 is mutually redistributing CE1's OSPF table with MPBGP
- PE1 exchanges MPBGP routes with PE2.
- PE2 is mutually redistributing CE2's OSPF table with MPBGP
- CE2 is speaking *iBGP and OSPF to PE2 inside vrf foo

So the problem is that the OSPF routes redistributed into MPBGP from via one CE are being announced to the other CE via the PE-CE BGP process.  Because those routes are already being received by the CE via the PE-CE OSPF process, they are showing up in the CE's BGP table as RIB failures.

Is there any way to filter those out?  I've tried setting and matching tags and communities from within various redistribution points on the PE, but I can't seem to keep them out of the CE's BGP table.

* I'm not sure how common it is to speak iBGP between a CE and a PE, so I figure I'd mention it.  It's not a typo, it's a requirement in this particular instance.

Thanks in advance for any clues..