The MPLS-OPS Archive

[Roger Clark Williams <rogerw@nordlink.com>]

Yugandar, you should be able to ping between the two Bank 1 CEs of course, 
as they are on the same VPN. And of course you should be able to ping 
between the public interfaces  interface of the two PEs. As others have 
noted, the only way to ping between any 1 VPN interface and a public 
interface is using the "ping vrf" command.

Testing is not the same as understanding, and if the ping betwen CEs 
doesn't work, what then? It is worth going through the exercise of 
following the routing knowledge across the network. First, see a given 
route in one CE routing table. Then see it in the VRF on the connected PE, 
then into the BGP side of that table. Continue on to the opposite PE's BGP. 
Then to the VRF, then to the CE. This is all done with variant show 
commands starting of course with show ip route on the first CE. This is an 
instructive process, and by simply disconnecting cables you can cause 
routes to be purged from various areas of their journey, thereby 
understanding each step as you see them disappear, then reappear when the 
link is reestablished. I can pretty much guarantee that if you take half an 
hour to do this, you will never be confused again, and you will be able to 
know in an instant where a given fault may lie.

Good luck.

Roger Williams

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>Subject: [MPLS-OPS]: Regarding Testing of BGP MPLS VPN
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>Hi,
>
>
>Thank u all for helping me..................regarding ping.
>
>Its working now. One more doubt!
>
>
>How to test the complete set up...I mean how to justify that BANK1 of PE1 
>can Reach BANK1 of PE2
>
>
>
>Bank1\                                                              /Bank2
>             \                                                   rip  / 
>
>        rip  \                                                      /
>                PE1-------ospf-----P--------ospf----------PE2
>               /                                                       \
>             /   rip                                             rip  \
>Bank2/                                                               \BANK1
>
>
>
>
>Can anybody tell how to test these setup. From PE1 i tried to ping the 
>loopback address of the PE2 ,but it is not working. How to test iBGP.
>
>SET UP:    RIP is running between all PE-CE links.
>                 OSPF is running as an IGP in Backbone
>                  Loop back address is given at both the PE routers.And 
> activated on both the routers.
>                  But Iam not getting  any information by giving   #sh ip 
> bgp on PE routers.
>
>
>
>
>Regards
>
>Yugandhar

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