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

Let's left something to be done on SP lab :)
I think this is too advanced for R&S and would not expect that on the exam.
Anyways, good to know that there is something like sham links so you
will not get heart attack when see those words in the task :)

Good luck!

-- 
Piotr Matusiak
CCIE #19860 (R&S, SEC)
2009/9/15 ALL From_NJ <all.from.nj_at_gmail.com>:
> 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
>>
>>
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>>
>>
>
>
> --
> Andrew Lee Lissitz
> all.from.nj_at_gmail.com
>
>
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