Re: [Idr] Fwd: New Version Notification for draft-spaghetti-idr-bgp-sendholdtimer-05.txt

[heasley <[e-mail]>]

Wed, Aug 03, 2022 at 02:28:26PM +0200, Job Snijders:
> > So I am asking what exactly is the trigger to fire that timer when BGP
> > can not write to a TCP socket ? Is it Error 105: No buffer space
> > available ? Something else ?
> 
> Something else! A POSIX.1 function like send() normally *blocks* if no

More succinctly, the socket is not writable without blocking.  The send
buffer is full.

> > If this is just queued keepalives (no BGP churn) then depending on the
> > buffer size it may take ages to fill ...
> 
> Indeed, and some BGP implementations do some form of 'SendQ Deduplication'

even if they did, a message such as a KA is already sent as far as it is
concerned - it is in the socket buffer and likely forgotten about.  so,
the buffer could fill will KAs - but still irrelevant.