LDP Neighbors

[John Blakley]

All,

I have a lab set up in GNS with a few routers. I have a single LSR that refuses to show neighbors:

R8#sh mpls ldp neigh

R8#

I have bindings on that router though:

R8#sh mpls ldp bindings

  tib entry: 3.3.3.3/32, rev 16

        local binding:  tag: 19

  tib entry: 7.7.7.7/32, rev 20

        local binding:  tag: 20

  tib entry: 8.8.8.8/32, rev 18

        local binding:  tag: imp-null

  tib entry: 9.9.9.9/32, rev 10

        local binding:  tag: 16

R8# sh mpls interfaces

Interface              IP            Tunnel   Operational

FastEthernet0/0        Yes (ldp)     No       Yes

FastEthernet0/1        Yes (ldp)     No       Yes

FastEthernet1/0        Yes (ldp)     No       Yes

All of my routes are going out as IP though:

tag    tag or VC   or Tunnel Id      switched   interface

16     Untagged    9.9.9.9/32        0          Fa1/0      10.89.89.9

17     Untagged    10.79.79.0/24     0          Fa1/0      10.89.89.9

       Untagged    10.79.79.0/24     0          Fa0/1      10.78.78.7

18     Untagged    10.37.37.0/24     0          Fa0/1      10.78.78.7

       Untagged    10.37.37.0/24     0          Fa0/0      10.38.38.3

19     Untagged    3.3.3.3/32        0          Fa0/0      10.38.38.3

20     Untagged    7.7.7.7/32        0          Fa0/1      10.78.78.7

       Untagged    7.7.7.7/32        0          Fa0/0      10.38.38.3

Is there anything that I can look at in particular? Shouldn't I see a neighborship with other routers as long as the interfaces connect and have 'mpls ip' enabled on them?

Thanks!

[Jon Marshall]

John

Is this a PE or P router ? If PE router are you using loopback for peering to other PEs ?

Jon

[John Blakley]

Jon,

I guess it would be a PE router considering the external connection to an ISP. It's R8 in the attachment. R8 connects to the ISP. I run bgp between ISP and R8, and ospf on the inside interfaces. There's no nat at the moment, but I was natting earlier during another test.

Thanks!

John

[John Blakley]

Jon,

I got it  You pointed me in the right direction..the simplest questions sometimes:

R8#sh mpls ldp neighbor

    Peer LDP Ident: 9.9.9.9:0; Local LDP Ident 8.8.8.8:0

        TCP connection: 9.9.9.9.18017 - 8.8.8.8.646

        State: Oper; Msgs sent/rcvd: 14/13; Downstream

        Up time: 00:00:20

        LDP discovery sources:

          FastEthernet1/0, Src IP addr: 10.89.89.9

        Addresses bound to peer LDP Ident:

          10.89.89.9      9.9.9.9         10.79.79.9      172.92.92.2

    Peer LDP Ident: 10.79.79.7:0; Local LDP Ident 8.8.8.8:0

        TCP connection: 10.79.79.7.22639 - 8.8.8.8.646

        State: Oper; Msgs sent/rcvd: 13/12; Downstream

        Up time: 00:00:19

        LDP discovery sources:

          FastEthernet0/1, Src IP addr: 10.78.78.7

        Addresses bound to peer LDP Ident:

          10.37.37.7      10.78.78.7      10.79.79.7      7.7.7.7

    Peer LDP Ident: 3.3.3.3:0; Local LDP Ident 8.8.8.8:0

        TCP connection: 3.3.3.3.646 - 8.8.8.8.29419

        State: Oper; Msgs sent/rcvd: 13/14; Downstream

        Up time: 00:00:15

        LDP discovery sources:

          FastEthernet0/0, Src IP addr: 10.38.38.3

        Addresses bound to peer LDP Ident:

I guess that if you have an external connection, then the external interfaces really need to belong to a VRF. I created an ISP vrf and put my serial interface in that vrf. Once I did that, all of my neighbors came up.

Thanks!