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

[Xu Hu]

Don't understand why the protocol between CE and PE why need two, iBGP and OSPF? Two vrfs?

Thanks and regards,
Xu Hu

On 26 Feb, 2012, at 11:35, Jason Lixfeld <jason at lixfeld.ca> wrote:

> 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..
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