Missing labels in T-LDP

Experts,

here I have a load-balanced path between directly connected ldp speakers :

PE4#sh mpls forwarding-table 192.168.2.0
Local Outgoing Prefix Bytes Label Outgoing Next Hop
Label Label or VC or Tunnel Id Switched interface
22 25 192.168.2.0/24 0 Fa1/0 172.16.14.1
       23 192.168.2.0/24 0 Fa3/0 172.16.34.3
PE4#

PE4#sh mpls ldp bindings 192.168.2.0 24 detail
  lib entry: 192.168.2.0/24, rev 22, chkpt: none
        local binding: label: 22 (owner LDP)
          Advertised to:
          1.1.1.1:0 3.3.3.3:0
        remote binding: lsr: 1.1.1.1:0, label: 25
        remote binding: lsr: 3.3.3.3:0, label: 23
        route information: state: none, table: default,
          next-hop: 172.16.14.1, remote label: 25
        route information: state: none, table: default,
          next-hop: 172.16.34.3, remote label: 23

If I change the ldp sessions to t-ldp, and keep everything else the same, the labels seem to disappear and traffic appears to go out untagged :

PE4#sh mpls forwarding-table 192.168.2.0
Local Outgoing Prefix Bytes Label Outgoing Next Hop
Label Label or VC or Tunnel Id Switched interface
22 No Label 192.168.2.0/24 0 Fa1/0 172.16.14.1
       No Label 192.168.2.0/24 0 Fa3/0 172.16.34.3
PE4#

PE4#sh mpls ldp bindings 192.168.2.0 24 detail
  lib entry: 192.168.2.0/24, rev 22, chkpt: none
        local binding: label: 22 (owner LDP)
          Advertised to:
          3.3.3.3:0 1.1.1.1:0
        remote binding: lsr: 3.3.3.3:0, label: 23
        remote binding: lsr: 1.1.1.1:0, label: 25
        route information: state: none, table: default,
          next-hop: 172.16.14.1, remote label: <----- no label
        route information: state: none, table: default,
          next-hop: 172.16.34.3, remote label: <----- no label
PE4#

I'm a bit confused by this. I would have expected the traffic to continue to be labeled and the labels to remain the same.

Can anyone shed some light on why this happens?

Thanks,
Marcel

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Received on Thu Oct 08 2009 - 10:13:47 ART