Re: OSPF in MPLS vpn

Petr,
yes, that's the issue, though I didn't fully understand how it works.
Now it seems I got it, would like to check:

Routes are coming to the PE2 as IA. As part of the vrf - OSPF
integration, IA routes are assumed to come from another PE and
get the routing bit cleared, thus no set in the RIB (iBGP should
win).

There is another way to fix this that is by setting capability vrf-lite.
That disables the down bit and the clearing of the route bit.
As long as you have sham links, this holds.

Any downsides ?
-Carlos

Petr Lapukhov @ 08/04/2011 20:23 -0300 dixit:
> Carlos,
>
> Not sure if I understand the topology correctly, but I see the situation
> as PE2 ignoring the inter-area prefixes originated by CE2 and not
> redistributing it into MP-BGP. This is a normal behavior, since PE
> devices assume to be connected to the OSPF super-backbone, and therefore
> ignore the inter-area prefixes for routing, though they still flood the
> corresponding type-3 LSAs over the sham-link. You may resolve this issue
> by configuring a virtual-link connecting CE2 and PE2 - this will connect
> area 0 and the superbackbone.
>
> HTH
> --
> Petr Lapukhov, petr_at_INE.com
> CCIE #16379 (R&S/Security/SP/Voice)
> CCDE #20100007
>
> Internetwork Expert, Inc.
> http://www.INE.com <http://www.ine.com/>
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> Outside US: 775-826-4344
>
> 2011/4/8 Carlos G Mendioroz <tron_at_huapi.ba.ar <mailto:tron_at_huapi.ba.ar>>
>
> Hi,
> I've run into a situation that is giving me a hard time :(
>
> CE1 - PE1 ... PE2 - CE2 - R
>
> CE-PE links are using OSPF area 1, CE2 - R is OSPF area 0.
> To get area 1 routes as intra area, a sham link is set between PE1
> and PE2.
>
> Now here's the catch. R routes get to CE2 (an ABR) and type 3 LSRs
> do get to CE1 over the sham link. So CE1 sees R routes.
> But PE2 and PE1 do not.
>
> I fail to understand why... wouldn't mind a litle help :)
>
>
> --
> Carlos G Mendioroz <tron_at_huapi.ba.ar <mailto:tron_at_huapi.ba.ar>>
> LW7 EQI Argentina
>
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-- 
Carlos G Mendioroz  <tron_at_huapi.ba.ar>  LW7 EQI  Argentina
Blogs and organic groups at http://www.ccie.net