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

Super cool guys, many thanks.

Yeah, I read about the 'super backbone' and figured this was being
considered another area ... it is a super area. ;-)

Thanks team ... I do not see sham links on the blue print ... perhaps this
is 'in-there' or implied somewhere? Please comment.

Many thanks again!!!

Andrew

On Mon, Sep 14, 2009 at 7:27 PM, Luis Anzola <lanzola_at_desca.com> wrote:

> Hi Andrew,
>
> You get IA routes because it is the default behavior when you us OSPF as
> PE-CE routing protocol as Piotr commented. In a normal situation when you
> redistribute BGP into OSPF you will have a External Route. In this case,
> OSPF use the concept of Super Backbone inside the MPLS Domain where the
> Redistribution from MP-BGP into OSPF generates IA routes to avoid the
> following caveats:
>
> * External routes cannot be summarized.
> * External routes are flooded across all OSPF areas.
> * External routes could use a different metric type that is not comparable
> to OSPF Cost.
> * Internal routes are always preferred over external routes, regardless of
> their cost.
>
>
> Ing. Luis Anzola
>
> CCIE # 21959 | e-mail: lanzola_at_desca.com
>
> -----Mensaje original-----
> De: nobody_at_groupstudy.com [mailto:nobody_at_groupstudy.com] En nombre de ALL
> From_NJ
> Enviado el: Lunes, 14 de Septiembre de 2009 04:47 p.m.
> Para: Cisco certification
> Asunto: mpls vpn question - pe to ce protocol is OSPF
>
> 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
>
>
> Blogs and organic groups at http://www.ccie.net
>
> _______________________________________________________________________
> Subscription information may be found at:
> http://www.groupstudy.com/list/CCIELab.html
>
>
>
>
>
>
>
>

-- 
Andrew Lee Lissitz
all.from.nj_at_gmail.com
Blogs and organic groups at http://www.ccie.net