[j-nsp] Resolving BGP routes using LDP tunnels

Armin Arh armin at schlund.de
Thu Jul 13 08:28:56 EDT 2006


this should work.
Of course you should have an IGP configured like OSPF or ISIS.
Then LDP computes labels for all IGP routes, hop by hop.

R2 receives then a MPLS packet from R3 with a label
that points towards R1. R2 then forwards it
to R1 without looking into the IP header.


On Thu, 13.07.2006, 17:18:38 +0530, Abhishek Verma wrote:
> Hi,
> I have a doubt with using BGP and it recursively resolving the
> next-hops using MPLS tunnels.
> R1 -- R2 -- R3
> I am running LDP between R1, R2 and R3 and R1 is aware of R3's
> loopback address to mpls label binding because of LDP.
> Now, i am running BGP between R1 and R3. There are some routes
> advertised by R3 to R1, with R1's NEXT_HOP.
> Is it possible for R1 to use the labelled path from R1 to R3 when
> recursively resolving the next-hops for the BGP learnt routes.
> I know that this happens when there exists an RSVP tunnel from R1 to
> R3. My question is that will this also work for LDP exchanged labels?
> Thanks,
> Abhishek.
> _______________________________________________
> juniper-nsp mailing list juniper-nsp at puck.nether.net
> http://puck.nether.net/mailman/listinfo/juniper-nsp

Armin Arh
Schlund + Partner AG
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