Tracking ATM PVC enabled with MPLS

Unanswered Question
Apr 25th, 2007

We are trying to identify a method where the ATM sub-interface enabled with Mpls shows line protocol UP but the ip reachability to the other side of the PVC is not there due to some issues in the ATM backbone.

Can we would be able to use the track 1 interface ip routing would help us . If so ,when it identifies the ip reachability on the PVC is done,will it log into the router or can it send to the management station. We are trying to deploy the same in 7600 switches running 12.2(18)SXF4.



Anantha Subramanian Natarajan

I have this problem too.
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Harold Ritter Wed, 04/25/2007 - 13:27


Your routing protocol should detect the fact that something is going wrong in the ATM core, right?


anasubra_2 Wed, 04/25/2007 - 13:56

Hi Hritter,

You right and we actually worried about a situation where the layer 3 (OSPF) neighborship went down but still the layer 2 ATM PVC Line protocol status saying up.


Anantha Subramanian Natarajan

swaroop.potdar Wed, 04/25/2007 - 20:57

You may want to think of using OAM for PVC management. As it sends Loopback cell echoes between the end points and upon failure to receive the configured Echo Cell replies it brings the corresponding PVC down.

This may as well prevent blackholing of the traffic till the OSPF adjacency is bought down due to the failure.

Here is a link on this feature:



Harold Ritter Fri, 04/27/2007 - 05:30


In my opinion, it would make more sense to reduce the ospf hello timer. I have seen people using the OAM feature when no routing protocols were involved.


swaroop.potdar Fri, 04/27/2007 - 07:46

Hi Harold,

Yes, I agree, thats another way of doing it.

But if particularly if its needed to get the line protocol down for alarms/logs purpose as a proactive measure to react in time. This could be used as well.




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