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

I realized tonight when writing a blog about MPLS L3 VPN -- I think it is
awesome that Cisco has this on the exam because you HAVE to be an expert in
a LOT of different underlying technologies to configure it. For instance...

Frame-Relay
OSPF
OSPF over Frame-Relay (more than likely)
BGP (including MP-BGP, address-families...)
VRFs
Redistribution mutually between BGP and RIP, EIGRP, and OSPF

If you don't know how to configure those underlying pieces individually, you
will stand now chance : ) Nice!

On Tue, Sep 15, 2009 at 12:28 AM, ALL From_NJ <all.from.nj_at_gmail.com> wrote:

> You rock, thanks
>
>
> On Tue, Sep 15, 2009 at 12:26 AM, Piotr Matusiak <piotr_at_ccie1.com> wrote:
>
> > 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
> > >>
> > >>
> > >> Blogs and organic groups at http://www.ccie.net
> > >>
> > >>
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> > >>
> > >>
> > >>
> > >>
> > >>
> > >>
> > >>
> > >
> > >
> > > --
> > > 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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-- 
Regards,
Joe Astorino - CCIE #24347 R&S
Technical Instructor - IPexpert, Inc.
Cell: +1.586.212.6107
Fax: +1.810.454.0130
Mailto:  jastorino_at_ipexpert.com
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