AW: [j-nsp] BFD advice

[martin schneidhofer]

hi all,

are there any experience in BFD operability
between juniper and cisco equipment -
especially with ospf ?

bye,
			/martin

> -----Ursprüngliche Nachricht-----
> Von: juniper-nsp-bounces at puck.nether.net 
> [mailto:juniper-nsp-bounces at puck.nether.net] Im Auftrag von 
> Lewis, Charles
> Gesendet: Mittwoch, 3. August 2005 18:50
> An: George Yalamov; juniper-nsp at puck.nether.net
> Betreff: RE: [j-nsp] BFD advice
> 
> We run it pretty extensively.  We've found that the timer 
> itself really shouldn't go much below 75 ms and that a 
> multiplier of four has proven safest (applied over various 
> flavors of Ethernet within 100km or so).
> When we've tried to run much tighter we've hit situations 
> where ppmd apparently isn't getting enough CPU time and 
> periodic false link failures occur.  In other words, your lab 
> conclusions seem to be consistent with our experiences.
> 
> There have been rumblings about putting bfd into the PFE - 
> this would probably yield much better detection times and 
> improve stability.  I don't know whether/if this is on any 
> roadmaps, though.
> 
> I don't know if you plan to run them but there's a pretty 
> significant caveat with BFD on J-series boxes.  Timer values 
> that are fine on our M boxes have proven unstable on the 
> J-series.  Roughly speaking we've found stability around 800 
> ms or so (~200ms x 4).  We've been led to understand that 
> this is a function of how the kernel is prioritizing locally 
> terminating traffic that's specific to the platform.  
> Hopefully this will be addressed soon.
> 
> CHL
> 
> -----Original Message-----
> From: juniper-nsp-bounces at puck.nether.net
> [mailto:juniper-nsp-bounces at puck.nether.net] On Behalf Of 
> George Yalamov
> Sent: Wednesday, August 03, 2005 11:45 AM
> To: juniper-nsp at puck.nether.net
> Subject: [j-nsp] BFD advice
> 
> 
> 
> Hi all,
> 
> 	Does any one have real life experance with BFD, tunning 
> timers, measurement of traffic disruption between 2 end 
> points, convergance time
> 
> in IGP (ISIS for example).
> 
> I've tested this feature in lab environment with some M 
> boxes, and the minimum time of traffic interruption was 200 - 
> 400ms measured with iperf.
> 
> Any ideas?
> 
> 
> regards
> George
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