no ping between two remote routers via MPLS VPN

[Volodymyr Khrystenko]

Hello.

I have to CE routers connected via two PEs and MPLS. MP-BGP session is established. Routes are exchanged and CE also has all needed routes. But no ping and traceroute((( I have checked LSP, LIB,LFIB, CEF. Everything is ok. But still no responce from the first PE router:

R9#traceroute 172.16.35.1

Type escape sequence to abort.

Tracing the route to 172.16.35.1

  1 192.168.22.2 116 msec 128 msec 24 msec

  2  *  *  *

  3  *  *  *

Here 22.2 is PE internal interface. Where should I dig further? It seems that data plane does not working.

[Eehab Suliman]

Try:

traceroute vrf XYZ 172.16.35.1

kind regards, Eheab

[Volodymyr Khrystenko]

I tried this))) The same result. I tried with different sources - the result the same.

[Volodymyr Khrystenko]

I have asked and I found the answer))) It appears to be very interesting situation)

I have created iBGP session between two loopback addresses but they both have mask /24. The problem here is that OSPF by default sees loopbacks as /32 interfaces and advertise them as /32 networks. LDP sees them as they are - /24 and creates LDP sessions between /24 interfaces. Ans this is the problem - LDP may fail to correctly apply label for remote PE. So there are two solutions:

1. Apply /32 mask to ip address of loopback.

2. Command ip ospf metwork-type point-to-point.

And everything is working.