Re: inter AS mpls VPN

Jack,

There is a label exchanged via VPNv4. The PE will use the local ASBR as the
next hop (which they have a label for) and the ASBRs then exchange labels
via VPNv4. The LFIB looks a little different, like this:

ASBR1#sho mpls forwarding-table label 22
Local Outgoing Prefix Bytes tag Outgoing Next Hop
tag tag or VC or Tunnel Id switched interface
22 20 200:1:200.1.1.1/32 \
                                     540 Se1/0 point2point

In this case ASBR1 assigned a local label of this prefix of 22 and passes it
to its LDP peer (a P router in this case). It has learned label 20 from the
ASBR in another AS via MP-EBGP.

On Tue, Jul 21, 2009 at 8:47 AM, jack daniels <jckdaniels12_at_gmail.com>wrote:

> Hi All,
>
> I was studying Inter as MPLS VPN ( MP-EBGP between directly connected ASBR)
>
> Between ASBR we have MPBGP , my Q is about forwarding plane
>
> How packet is forwarded from one ASBR to other ASBR when there is no LDP
> between them and there is no LABEL for next hop just VPN LABEL.
>
>
> Regards
>
>
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-- 
Bryan Bartik
CCIE #23707 (R&S), CCNP
Sr. Support Engineer - IPexpert, Inc.
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