OSPF Fluctuations every 32 Minutes in CSC Environment

Unanswered Question
May 18th, 2009

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

  • 1
  • 2
  • 3
  • 4
  • 5
Overall Rating: 0 (0 ratings)
Loading.
Giuseppe Larosa Mon, 05/18/2009 - 04:18

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

Giuseppe


guruprasadr Mon, 05/18/2009 - 05:22

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

Giuseppe Larosa Mon, 05/18/2009 - 05:36

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


see


http://www.cisco.com/en/US/docs/ios/12_0s/feature/guide/fsldpsyn.html#wp1054554


on in the field of MPLS LDP graceful restart


http://www.cisco.com/en/US/docs/ios/mpls/configuration/guide/mp_ldp_grace_rstrt_ps6350_TSD_Products_Configuration_Guide_Chapter.html



Hope to help

Giuseppe


Actions

This Discussion