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OSPF Fluctuations every 32 Minutes in CSC Environment

Rising star
Rising star

Hello Experts,

We experience the OSPF Fluctiations every 32 Minutes i.e. configured between PE & 'CSC' Router.

Note: It's a CSC Setup.

Few points are:


1) Last Mile is Healthy

2) OSPF Configuration are Fine

3) No MTU Related issues.

Can someone help in identifying the exact cause for the same.

Best Regards,

Guru Prasad R

3 Replies 3

Giuseppe Larosa
Hall of Fame Master Hall of Fame Master
Hall of Fame Master

Hello Guru,

each OSPF LSA is refreshed by the original owner every 30 minutes on average, (LSA group pacing waits to collect a group of LSAs to refresh).

A new version of LSAs trigger a SPF recalculation and this might explain what you see.

Hope to help


Hello Giuseppe,

Thanks for the Reply.

I tried 'LSA Group Pacing' in CSC Router, but the problem was continue to be existing.

Any more help, would be really Appreciable.

Best Regards,

Guru Prasad R

Hello Guru,

I would suggest you to better define the problem:

what do you mean with OSPF fluctuations?

I may guess you can experience temporary loss of MPLS connectivity but it is a wild guess.

In this case you can try to play with LDP synchronization


on in the field of MPLS LDP graceful restart

Hope to help


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