BFD is your friend. Yes it's require both parties to understand it but it much better than 30sec hold time. BIRD already have support for BFD
> On 27 окт. 2015 г., at 10:31, "marcel.durega...@yahoo.fr" > <marcel.durega...@yahoo.fr> wrote: > > Hello, > > As all of us know BGP was designed for scalability, thus slow convergence. > But it was also when CPU was slow :-). > > What do you think about the standard eBGP hold timer of 180sec ? Conservative > ? > > I'm asking because we see more and more peering partners which force the hold > timer to a lower value, and when BGP negotiate the timer, the lowest hold > timer is the winner. > > Shall we all decide that for global faster convergence we should ALL decrease > the hold timer ? Or those guys which are lowering their (and our) timers on > IX LAN play a dangerous game ? > > > See a example of our peering router at AMS-IX (hold from 30s to 180s): > > > ...... > BGP neighbor is 193.239.116.13x, remote AS 12x54, external link > Last read 00:00:42, last write 00:00:13, hold time is 180, keepalive > interval is 60 seconds > > BGP neighbor is 193.239.116.13x, remote AS 31x77, external link > Last read 00:00:09, last write 00:00:03, hold time is 90, keepalive interval > is 30 seconds > > BGP neighbor is 193.239.116.13x, remote AS 4x562, external link > Last read 00:00:30, last write 00:00:07, hold time is 180, keepalive > interval is 60 seconds > > BGP neighbor is 193.239.116.14x, remote AS 4x350, external link > Last read 00:00:01, last write 00:00:01, hold time is 30, keepalive interval > is 10 seconds > > BGP neighbor is 193.239.116.14x, remote AS 341x1, external link > Last read 00:00:09, last write 00:00:27, hold time is 180, keepalive > interval is 60 seconds > > BGP neighbor is 193.239.116.14x, remote AS 2x028, external link > Last read 00:00:00, last write 00:00:21, hold time is 180, keepalive > interval is 60 seconds > > BGP neighbor is 193.239.116.15x, remote AS 41x52, external link > Last read 00:00:27, last write 00:00:11, hold time is 90, keepalive interval > is 30 seconds > > BGP neighbor is 193.239.116.18x, remote AS 1x041, external link > Last read 00:00:20, last write 00:00:14, hold time is 90, keepalive interval > is 30 seconds > > BGP neighbor is 193.239.116.18x, remote AS 162x8, external link > Last read 00:00:28, last write 00:00:06, hold time is 180, keepalive > interval is 60 seconds > > BGP neighbor is 193.239.116.20x, remote AS 47x86, external link > Last read 00:00:59, last write 00:00:21, hold time is 180, keepalive > interval is 60 seconds > > BGP neighbor is 193.239.116.21x, remote AS x3350, external link > Last read 00:00:02, last write 00:00:01, hold time is 30, keepalive interval > is 10 seconds > > BGP neighbor is 193.239.116.24x, remote AS x5133, external link > Last read 00:00:24, last write 00:00:03, hold time is 90, keepalive interval > is 30 seconds > > ..... > > > I've somehow basically anonymized ip and AS just in case I'm not allowed to > publish those details. > > > Best Regards, > -Marcel
