Re: ISIS Level-11 router + MPLS Labels for Level-2 Loopbacks

Hi,

It seems like you're missing the concept of ISIS route leaking on
L1/L2 routers. However, If you indeed hate that idea, then you have
two basic choices for constructing PE2PE LSPs with IGP route
summarization. Either use inter-area MPLS TE tunnels between the PEs
or create an overlay BGP mesh that spans over L1/L2 routers and PEs
and propagates the PE Loopback prefixes. Using those two ways you may
effectively create LSPs even when with IGP route summarization in
place. Detailed configurations are a bit complicated for each case, so
I omit those. There are other solutions proposed to resolve the
"summarization" problem (there is even an RFC), but Cisco does not
implement them (yet).

HTH,

-- 
Petr Lapukhov, petr_at_INE.com
CCIE #16379 (R&S/Security/SP/Voice)
Internetwork Expert, Inc.
http://www.INE.com
Toll Free: 877-224-8987
Outside US: 775-826-4344
2010/2/9 Service Provider <service.providersa_at_gmail.com>:
> Hi guys
>
> I have a scenario where one of the PE routers is a Level-1 and connects to a
> P router which is L1L2. The problem is that the L1 has a default route from
> the P router, which if fine, but I'm unable to have end-to-end reachability
> between the CE routers. I am only able to achieve this when I redistribute
> Level-2 routes into Level-1 on the P router. I have configure the Level-1
> router to generate the label(s) for the default route but I still don't have
> connectivity between the CE routers.
>
> CE1-------------PE1-----------------------P----------------------PE1--------------------------CE2
>                    L1                       L1L2                    L2
>
> Any assistance will be appreciated.
>
> Thank you
> SP
>
>
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