What is your LDP router-id? Run "show mpls ldp discovery" you should see
tx/rx if it's good and how you the RID too.

R2(config-if)#do sh mpls ldp dis
 Local LDP Identifier:
    192.1.23.3:0
    Discovery Sources:
    Interfaces:
        FastEthernet0/0 (ldp): xmit/recv
            LDP Id: 192.1.23.2:0

I just pasted your config into my routers and the LDP peering came right up
on directly connected link

*Mar  1 00:02:02.947: %LDP-5-NBRCHG: LDP Neighbor 192.1.23.2:0 (1) is U

R2(config-if)#do sh mpls ldp ne
    Peer LDP Ident: 192.1.23.2:0; Local LDP Ident 192.1.23.3:0
        TCP connection: 192.1.23.2.646 - 192.1.23.3.46807
        State: Oper; Msgs sent/rcvd: 5/5; Downstream
        Up time: 00:00:55
        LDP discovery sources:
          FastEthernet0/0, Src IP addr: 192.1.23.2
        Addresses bound to peer LDP Ident:
          192.1.23.2

Make sure you have directly connected neighbor, and if you're using
loopback make sure it's reachable from your peer router as well

Thanks,
Steve Di Bias- CCIE #32840


On Wed, Jun 19, 2013 at 9:30 AM, isaac mukhwana <[email protected]> wrote:

> WITH ROUTER 2 AND ROUTER 3 DIRECTLY CONNECTED ON THEIR FA0/0 PHYSICAL
> INTERFACES, I CANNOT GET THEM TO FORM LDP NEIGHBORS, SHOW MPLS LDP
> NEIGHBOR COMMAND LISTS NO NEIGHBOR.
> AM I MISSING SOMETHING HERE??
> ROUTER 2
>
> mpls label range 200 299
> mpls label protocol ldp
>
>
> interface FastEthernet0/0
>  ip address 192.1.23.2 255.255.255.0
>  duplex auto
>  speed auto
>  mpls label protocol ldp
>  mpls ip
> !
>
> interface FastEthernet0/1
>  ip address 192.1.12.2 255.255.255.0
>  duplex auto
>  speed auto
>  mpls label protocol ldp
>  mpls ip
>
> ROUTER 3
>
> mpls label range 300 399
> mpls label protocol ldp
> !
> interface FastEthernet0/0
>  ip address 192.1.23.3 255.255.255.0
>  duplex auto
>  speed auto
>  mpls label protocol ldp
>  mpls ip
> !
>
> interface FastEthernet0/1
>  ip address 192.1.34.3 255.255.255.0
>  duplex auto
>  speed auto
>  mpls label protocol ldp
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