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

[Oliver Boehmer (oboehmer)]

Jason,

> Yes, you only need one, except when you need more than one :)
> 
> OSPF is used so the CE routers can make use of the PE superbackbone.
> 
> iBGP is used to feed the CEs a full BGP table because IP transit
customers
> hang off the same CE router and they expect a full BGP feed from us.

iBGP as PE-CE routing protocol is not officially supported in IOS (i.e.
between a real L3VPN PE and a CE as described in
draft-marques-l3vpn-ibgp. running it in vrf-lite is supported for most
scenarios, IIRC), and you might already have noticed this as you might
have needed to tweak the next-hop manually? Having said this, I'm not
sure what prevented you from filtering out the prefixes based on some
regular communities you have set when redistributing the OSPF prefixes
to MP-BGP on the ingress PE1? Can you share some config examples? 

> The RIB failures aren't causing any issues because the OSPF routes are
> taking precedence over their BGP duplicate counterparts, but it'd
still be
> nice to tune the PE to not announce them towards the CE, if possible.

can you share some configs/show-cmds you tried without success?

	oli