Targeted LDP session

In MPLS we can form LDP session between the LSR which is not directly connected.

As previously we know R4 and R3 established LDP Session. Now we going to form peer between R4 and R1.

 R4(config)#mpls ldp neighbor 10.0.0.1 targeted ldp

R4#sh mpls ldp di

 Local LDP Identifier:

    4.4.4.4:0

    Discovery Sources:

    Interfaces:

        Serial1/0 (ldp): xmit/recv

            LDP Id: 3.3.3.3:0

    Targeted Hellos:

        4.4.4.4 -> 10.0.0.1 (ldp): active, xmit

Still it didn’t form  peer with R1. To do that we need to accept the invitation from R4 on R1.

R4(config)#mpls ldp neighbor 1.1.1.1 targeted ldp

R1(config)#mpls ldp discovery targeted-hello accept from R4

R1#sh ip access-lists

Standard IP access list 1

    10 permit 4.4.4.4

Standard IP access list R4

R1#sh mpls ldp neighbor 4.4.4.4 detail

    Peer LDP Ident: 4.4.4.4:0; Local LDP Ident 1.1.1.1:0

        TCP connection: 4.4.4.4.59522 - 1.1.1.1.646

        State: Oper; Msgs sent/rcvd: 18/18; Downstream; Last TIB rev sent 28

        Up time: 00:05:25; UID: 4; Peer Id 2;

        LDP discovery sources:

          Targeted Hello 1.1.1.1 -> 4.4.4.4, passive;

            holdtime: 90000 ms, hello interval: 10000 ms

        Addresses bound to peer LDP Ident:

          10.0.0.10       11.0.0.9        11.0.0.13       4.4.4.4

        Peer holdtime: 180000 ms; KA interval: 60000 ms; Peer state: estab