Multi-homed clients and BGP timers

Mon May 25 20:09:40 UTC 2009

* Danny McPherson:

> On May 25, 2009, at 11:33 AM, Florian Weimer wrote:
>
>> * Iljitsch van Beijnum:
>>
>>> 30 60 isn't a good choice because that means that after 30.1
>>> seconds a
>>> keepalive comes in and then after 60.0 seconds the session will
>>> expire
>>> while the second one would be there in 60.1 seconds.
>>
>> Wouldn't the underlying TCP retry sooner than that?
>
> I suspect that given update messages serve as implicit
> keepalives, it's _extremely rare that an actual keepalive
> message is needed in global routing environments.

See the subject of this thread. 8-) I don't think we're talking about
full tables here, so you actually have to rely on keepalives
(plus TCP retransmits).