Re: mpls vpn question - pe to ce protocol is OSPF

Hi,

When your OSPF process and Domain-ID are the same on both PE, the OSPF
prefixes will be seen as IA on the other end. This is default
behaviour of OSPF and it is useful in case you have some backdoor
connection between sites. Then you can configure OSPF on that link and
it will be preferred over the MPLS link (because Intra-Area is better
than Inter-Area).
On the other hand you would like to use MPLS network, so in that case
you need to configure Sham-link and your OSPF prefixes will be seen as
O (Intra-area) routes.

HTH,

-- 
Piotr Matusiak
CCIE #19860 (R&S, SEC)
2009/9/14 ALL From_NJ <all.from.nj_at_gmail.com>:
> Hey yall, ;-)
>
> I hope this email finds you doing well.
>
> Labed up a scenario and have a quick question about OSPF routes on either
> CE.  They show as IA.
>
> On each PE, I have the same process number and the same domain-id is listed
> in the show ip ospf 2 command (I am using process number 2 for my vrf).  I
> know this would show an E2 route ... but just the same, the configs are
> identical.  Also ping and everything works fine across the MPLS backbone.
>
> Why would I get IA and not an 'O' ?  The little research I did makes this
> appear "it is what it is".
>
> Back when I used to actually work w/ MPLS, I forgot if this was ever an
> issue ... humm ... don't remember ever being worried about this.
>
> Any thoughts?
>
> I am going to be moving on to EIGRP or RIP tonight, but if anyone has any
> thoughts or comments I would love to hear them.  Kindest regards team,
>
> --
> Andrew Lee Lissitz
> all.from.nj_at_gmail.com
>
>
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