What do you have for hold timers? And
is it the same for both route servers?
rs2 is proposing 240 seconds, if I'm
reading this packet capture correctly.
I can set a "min hold time" value in BIRD. If we find that raising
the hold timer fixes the issues, I will probably set a minimum. If I
set that, it will break the sessions with lower values immediately,
so this would need some transition. That would probably look
something like: 1) See who it would affect and email them. 2) Enable
it on one route server. 3) After a bit, enable it on the other route
server.