Re: OSPF Superbackbone Concept

No problem Lejoe

Regards
Anantha Subramanian Natarajan

On Wed, Nov 4, 2009 at 8:35 PM, Lejoe <styran_at_gmail.com> wrote:

> Hi Anantha,
>
> Thank you for the response. However,the paragraph in RFC highlights
> the extension of area 0, if one of the links on the CE belongs to Area
> 0.
>
> Well reading the RFC cleared the murkiness. I believe, the statement
> in the book means, if the CE has one more links belonging to different
> OSPF areas, then the link between that CE and PE belonging to same
> OSPF domain must be in Area 0.
>
> Thank you once again for your response.
>
> Regards
>
> Lejoe
>
>
>
>
>
> On Thu, Nov 5, 2009 at 6:44 AM, Anantha Subramanian Natarajan
> <anantha.natarajan_at_gravitant.com> wrote:
> > Hi Lejoe,
> >
> > I will state my understanding and hopefully experts in the group may
> add
> > to it or correct it.Also obviously, you could correct it,if something
> stated
> > wrong,
> >
> > Check the below RFC 2547
> >
> > http://tools.ietf.org/html/draft-rosen-ppvpn-ospf2547-area0-02#page-3
> >
> > It states as below,when we may require OSPF Area0(backbone area 0) other
> > than the MPLS VPN superbackbone area
> >
> > "
> >
> > If the OSPF domain has any area 0 routers (other than the PE
> > routers), then at least one of those MUST be a CE router, and MUST
> >
> > have an area 0 link to at least one PE router. This adjacency MAY be
> > via an OSPF virtual link. This is necessary to ensure that inter-area
> > routes and AS-external routes can be leaked between the PE routers
> >
> > and the non-PE OSPF backbone.
> > "
> >
> > Is the above answers your question or I completely misunderstood your
> > question..Kindly let us know
> >
> > Thanks
> >
> > Regards
> > Anantha Subramanian Natarajan
> >
> >
> >
> > On Tue, Nov 3, 2009 at 6:22 AM, Lejoe <styran_at_gmail.com> wrote:
> >>
> >> Hi all,
> >>
> >> The OSPF superbackbone concept allows to migrate from the traditional
> >> OSPF concept to MPLS VPN by the use of another backbone, i.e OSPF
> >> superbackbone. Area 0 is no longer a requirement.
> >>
> >> I would like to know when is Area 0 a requirement in MPLS VPN. More
> >> specifically, if anybody could explain the statement below.
> >>
> >> MPLS Configuration on Cisco IOS, Chapter 5 ,Pg 144 states Area 0 is a
> >> requirement only when the PE router is connected to two different
> >> non-backbone areas belonging to the same OSPF domain on a PE router.
> >>
> >>
> >> Lejoe
> >>
> >>
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Received on Thu Nov 05 2009 - 07:18:23 ART