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

[Thomas Mangin <[e-mail]>]

Hi,


> Zero windows is a way for TCP to apply back pressure to a peer.
>

Correct. It puts the pressure on memory (and CPU) to the sender which needs
to keep its outgoing update queue larger than it should as the receiver can
not process them fast enough.

I am sure it is useful in some cases and can prevent devices from missing
keep-alive timers but when it is used to keep undersized routers in
production at the cost of propagation delays, it is really a nasty trick.

It allows a router upgrade cost problem to be passed to an EBGP peer, so I
can see why some may like the feature 😜 (even more so if the feature can
be set up on a per peer basis).

I would rather have a way to get my router configured to detect a peer not
processing updates in a timely removed from the path than leaving them in,
potentially keeping stale routes longer than required (or worse, causing
loops).

Therefore I see any work toward the detection of a router unable to process
updates in a timely manner is a step in the right direction.

Thomas