Re: OSPF as Protocol between between CE and PE in MPLS

Jack,

If the process numbers match on the PE's the route will be O IA by default.
If the process numbers do not match, it will be O E2.
If the process numbers do not match, set the domain-id on each PE to match
and it will go back to O IA.
Use the sham-link, to make the route strictly O (intra-area).

-hth

On Thu, Jul 16, 2009 at 9:36 AM, jack daniels <jckdaniels12_at_gmail.com>wrote:

> Hi ,
>
> Please help me in understanding What is odpf domain id.
> What I understand now is 1) to maintaince INTERA AREA route type we use
> SHAM
> LINK
> - is it right ?
>
> and for maintaining inter area routes we have MPBGP extended comunites
> carry
> OSPF route type , metric and OPF DOMAIN ID . Do we need to configure these
> copy from ospf to MPBGP? if so how .... as by default redistruion to OSPF
> from MPBGP orignates LSA 5.
>
> Regards
> J.Daniels
>
>
> On 7/15/09, Joe Astorino <jastorino_at_ipexpert.com> wrote:
> >
> > Hi Jack,
> >
> > Basically it is done with MP-BGP extended communities:
> >
> >
> > -- OSPF domain identifier extended community attribute -- This identifies
> > your OSPF domain
> > -- OSPF route type extended community attribute -- This identifies the
> LSA
> > type
> >
> > That way, you can preserve everything over the BGP session and when it
> gets
> > to the other side and gets redistributed into OSPF it is transparent.
> >
> > On Wed, Jul 15, 2009 at 1:10 PM, Luan Nguyen <luan_at_netcraftsmen.net
> >wrote:
> >
> >> You use the domain-id command.
> >> PEs in MPLS run MP-BGP among themselves. You redistribute from PE-CE
> >> routing protocol. Not quite understand your question...maybe you were
> >> referring to Sham-Link?
> >>
> >>
> http://www.cisco.com/en/US/docs/ios/12_2t/12_2t8/feature/guide/ospfshmk.html
> >>
> >> Regards,
> >>
> >> ------------------------------------
> >> Luan Nguyen
> >> Chesapeake NetCraftsmen, LLC.
> >> http://www.netcraftsmen.net
> >>
> >> -----------------------------------
> >>
> >>
> >> -----Original Message-----
> >> From: nobody_at_groupstudy.com [mailto:nobody_at_groupstudy.com] On Behalf Of
> >> jack
> >> daniels
> >> Sent: Wednesday, July 15, 2009 12:34 PM
> >> To: Cisco certification
> >> Subject: OSPF as Protocol between between CE and PE in MPLS
> >>
> >> Hi All,
> >>
> >> I have a querry when OSPF is used as Protocol between between CE and PE
> in
> >> MPLS -----
> >>
> >> Please answer inline -----
> >>
> >> 1) then we recieve our LSA 1 or 2 route in other CE as LSA 5 due to
> >> redistribution ....?
> >>
> >> 2) but I read we can get routes as inter area ? HOW
> >>
> >> 3) also if MPLS core is acting as SUPERBACKBONE and we have AREA 0 in
> >> customer sites , why will routes from cutomer CE area 0 to same customer
> >> other CE be sseen as O IA
> >> ???
> >>
> >>
> >> I'm still confused how is this done ..... I read about the Route type
> and
> >> route metric copied to BGP med ....
> >> But how route is still maintained by what configuration ................
> >>
> >>
> >> Regards
> >> J.Daniels
> >>
> >>
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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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-- 
Bryan Bartik
CCIE #23707 (R&S), CCNP
Sr. Support Engineer - IPexpert, Inc.
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