[j-nsp] Juniper M120 - PPM causing issues for BFD

Payam Chychi pchychi at gmail.com
Tue Nov 30 15:05:42 EST 2010


I was wondering if anyone else has had issues with M based routers and 
PPM, if so, any advice would be greatly appreciated.

Here is my situation:
- I have a m120 router that is now running BFD and IS-IS on a few links 
and OSPF on a few other links (no problem here)
- when I take a backup feb out of backup (N+1 group) and map it to a fpc, the 
router drops all ISIS neighbors.

A deeper look into the issue showed that ISIS is dropping because of 
BFD, a 3rd look showed that BFD was dieing due to the PPM

I'm assuming that the issue is related with PPM running on both feb and re.
Are there any caveats in disabling PPM on the FEB and letting it run 
only on the RE?

I assume the performance would be lower as its done in software vs the 
hw FEB but i cant imagine the difference to be noteworthy 


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