Hello!

There may be anything, including waiting for Netlink or CLI socket or other BIRDs, or even something totally unrelated that eats the three seconds. I'm quite surprised that it flaps only several times a day.

If I remember it correctly, there was somebody who used a 5/15 setup and still had to take a lot of care to keep the links up.

By the way, is there any good reason to have so short timeouts?

Maria

On June 11, 2018 8:51:06 PM GMT+02:00, saksham <saksham.manchanda@secure64.com> wrote:
Hi All,

    I am testing BGP stability with extremely aggressive timers. The
timers are 1/3. I see BGP flapping 2-3 times every 24 hours. Attached is
a packet capture, captured on the system running bird.

10.194.8.11 is a Cisco ASR.

10.194.8.13 is the running bird instance.

I see multiple keep-alives coming in from .11, but the bird instance
responds with hold timer expired. This was about after 12 hours in
established state.

Connection opens right back up again.

I don't see the same issue on upping the timers to 3/9 seconds.


Anyone see anything like this before?

Thanks,

Saksham


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