On Apr 21, 2021, at 5:52 PM, David Farmer <0000000e7948cb21-dmarc-request@LISTS.IPHOUSE.NET> wrote:

On Wed, Apr 21, 2021 at 5:36 PM Richard Laager <rlaager@wiktel.com> wrote:

On 4/21/21 3:04 PM, Frank Bulk wrote:
> And to follow up on my previous question, is Arista falling bit short in 
> our situation, by not supporting a receive interval of 10 msec?

I've had a couple vendors suggest not to make it that short. Brocade, 
for example, suggested 150 ms as a minimum. Arista was more vague, but 
from your error message, apparently their implementation doesn't even 
try to do less than 50 ms.

Maybe think about this from another perspective, 10 ms is 100 times a second, 50 ms is 20 times a second, and 150 ms just over 6 times a second.  I think 10 ms is probably being a little impatient.

Not the mention, the added CPU load on both ends dealing with said BFD packets 100x/sec.

We’ve generally seen 50-250ms used in practice. 10ms does seem super aggressive. We use 250ms x 3 here for backbone links and peers/transit that support BFD, and 750ms x 3 facing internal gear. 

—

Andrew Hoyos

hoyosa@gmail.com

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