[c-nsp] BFD on 12.2(33)

[Geir Jensen]

Thanks,

I wasn't aware of the CSCsc96524 bug..

We started out with 50ms, but we had to increase the timers to 200ms to
get rid of the flapping. But even at 200ms I see about one BFD false
negative a day.
We want to achieve SDH-like restoration times, so I would like to use
50ms*3 .... if it would work.....

Regards
Geir

-----Opprinnelig melding-----
Fra: Pascal Gloor [mailto:pascal.gloor at spale.com]
Sendt: 16. mai 2007 11:28
Til: Geir Jensen
Kopi: cisco-nsp at puck.nether.net
Emne: Re: [c-nsp] BFD on 12.2(33)


Hi Geir,

>> Does anyone have any experience with BFD on 12.2(33)SR?
>> We have troubles with BFD in a mixed 12.2(18)SXF7 and 12.2(33)SRB  
>> environment.
>> BFD will occasionally toggle our 10G interfaces  when we do "write  
>> mem" or shut/no shut, and I'd like to verify that the problem is  
>> caused  by the routers running 12.2(18)SXF7.  If so I can upgrade  
>> all routers to 12.2(33)SRB. Otherwise I'll have to consider  
>> running ospf fast hello.

The "shut/no shut/wr" bug is already known. CSCsc96524[1]. The bug id  
status is 'terminated/closed", however it doesnt seem to be fixed.  
Pretty funny that you sent this today, we were just testing SXF/SRB  
BFD compatibility.

So far, the only workaround we have found is to set the BDF timers to  
250ms. We're running 250ms BFD on SXF since over a year without any  
issue.

As far as I remember 150ms was flapping, 200ms not, so we took 250ms  
to have some margin.

If this doesnt meet your requirements, I urge you to ask cisco to  
reopen this Bug since its absolutly not fixed.



Regards,
Pascal

[1] http://tools.cisco.com/Support/BugToolKit/search/getBugDetails.do? 
method=fetchBugDetails&bugId=CSCsc96524
(you may need a CCO login)