[129222] in North American Network Operators' Group
Re: Did your BGP crash today?
daemon@ATHENA.MIT.EDU (Thomas Mangin)
Mon Aug 30 04:58:23 2010
From: Thomas Mangin <thomas.mangin@exa-networks.co.uk>
In-Reply-To: <20100830075152.GA19972@diehard.n-r-g.com>
Date: Mon, 30 Aug 2010 10:58:09 +0200
To: Claudio Jeker <cjeker@diehard.n-r-g.com>
Cc: nanog@nanog.org
Errors-To: nanog-bounces+nanog.discuss=bloom-picayune.mit.edu@nanog.org
> Apart from one big vendor most BGP speaker only send KEEPALIVES when =
they
> need to. So on my full feeds I see sessions running for more then 1 =
month
> which received less then 300 KEEPALIVE packets.=20
The negociaged holdtime is always the lower value presented between two =
routers. The default HoldTime timer for Cisco is 180 seconds and for =
Juniper 90.
So you should see a KEEPALIVE packet every minute from/to Cisco routers, =
and one every 30 seconds between Junipers.
Should a BGP speaker do not see any KEEPALIVE during $HOLDTIME, it will =
tear the session down.
You are telling me that your effective holdtime is 2592000 seconds when =
the HOLDTIME field is 16 bits ... hum ...
http://www.faqs.org/rfcs/rfc4271.html section 4.2
So unless you know something I don't, I believe you are totally mistaken =
:)
Thomas
