mpls vpn's

Hi Group, hope you don't get duplicates of this mail. I've just switched to
another email as nothing was getting though.

Wonder if someone can clear up a query for me. I'm working through Narbiks
MPLS section in his R&S workbook. I'm on the start of the MPLS VPN section.

R1 ----- R3 ------ R2 ------- R4 ------ R5

r1/r5 are CE's
r3 / r4 are PE's
R2 is a P

On one PE , we have the following route for the other end of the network on
R1.

R4#sh ip bgp vpnv4 vrf CB 1.0.0.0
BGP routing table entry for 1:20:1.0.0.0/8, version 8
Paths: (1 available, best #1, table CB)
  Not advertised to any peer
  Local, imported path from 1:10:1.0.0.0/8
    3.3.3.3 (metric 3) from 3.3.3.3 (3.3.3.3)
      Origin incomplete, metric 1, localpref 100, valid, internal, best
      Extended Community: RT:1:100
      mpls labels in/out nolabel/303

So it uses label 303 for this. But how does it know which interface to
use? I can't find 303 in the following tables,

sh mpls forwarding table
sh mpls ldp bindings
sh mpls ip binding

nor can I find it mentioned in the tables on the P router.

I'm obviously missing something, as it works just fine end to end! Can
someone explain how this works in LDP all the way to R1?

Paul

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Received on Wed May 15 2013 - 11:48:06 ART