All things related to multicast

[Brent Sweeny <>]

folks, for the last several days we (Abilene) are seeing frequent--and
even weirder--simultaneous resets of msdp sessions on Abilene, and
can't quite figure out what's going wrong.  here are some data points,
and I'll ask some questions at the end.
-- they SEEM to be happening just between the Abilene GSRs and various 
   peers who all appear to be Junipers
-- we're seeing this sort of message logged simultaneously across the
   entire Abilene network, from the east coast and west (19 msdp peers
   fail on it at the same second; probably another 30 or so stay up):
  May 10 20:50:42 UTC: %MSDP-5-PEER_UPDOWN: Session to peer 192.12.206.250 
going down
  May 10 20:50:42 UTC: MSDP: 192.12.206.250: Peer reset, other side reset
-- it's happening pretty much constantly.  the most they stay up between
   resets is about 15 mins.
-- our working theory is that Abilene is picking up something and resending
   it to everyone else that makes some peers barf. but we can't figure out 
what,
   and if so which side is broken.
-- this doesn't seem to be a GENERAL cisco-juniper interaction--others are
   working just fine--so it must be something about our traffic.  of course it
   may not be a cisco-juniper thing at all...
-- we've debugged cisco msdp detail and resets and messages and don't see
   anything vaguely related.  it all looks normal as far as we can tell.
-- we've also debugged one juniper side ("msdp packet") and see nothing at
   all.  it doesn't even say the session went down. otherwise its traffic
   looks normal (as far as we can tell): normal SAs being exchanged etc.
-- we've not yet opened a case with cisco or juniper but probably will.

esp since many of you also have Junipers which peer with Abilene, if you
see anything useful, or can think of something else specific to look at,
or better yet KNOW of something, we'd be grateful.
   TIA, brent
-- 
Brent Sweeny            

            812 / 855-5391
Indiana University Information Technology/Abilene Network Operations
2711 E 10th Street, Bloomington, IN  47408
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