nanog mailing list archives
Re: Did your BGP crash today?
From: Pierre Francois <pierre.francois () uclouvain be>
Date: Mon, 30 Aug 2010 11:21:42 +0200
Thomas,Wouldn't the confusion come from the fact that updates are considered as keepalives, so that Claudio sees so few type 4 messages because he receives updates ?
Sec 4.2, Hold Time : "The calculated value indicates the maximum number of seconds that may elapse between the receipt of successive KEEPALIVE and/or UPDATE messages from the sender." Regards, Pierre. Thomas Mangin wrote:
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 monthwhich received less then 300 KEEPALIVE packets.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
Current thread:
- Re: Did your BGP crash today?, (continued)
- Re: Did your BGP crash today? Paul Ferguson (Aug 29)
- Re: Did your BGP crash today? Dobbins, Roland (Aug 29)
- Re: Did your BGP crash today? Brett Frankenberger (Aug 29)
- Re: Did your BGP crash today? Thomas Mangin (Aug 29)
- Re: Did your BGP crash today? James Hess (Aug 29)
- Re: Did your BGP crash today? Randy Bush (Aug 29)
- Re: Did your BGP crash today? Claudio Jeker (Aug 30)
- Re: Did your BGP crash today? Thomas Mangin (Aug 30)
- Re: Did your BGP crash today? Daniel Verlouw (Aug 30)
- Re: Did your BGP crash today? Thomas Mangin (Aug 30)
- Re: Did your BGP crash today? Pierre Francois (Aug 30)
- Re: Did your BGP crash today? William Allen Simpson (Aug 29)
- Re: Did your BGP crash today? Jack Bates (Aug 30)
- Re: Did your BGP crash today? Kevin Oberman (Aug 30)
- Re: Did your BGP crash today? Mike Tancsa (Aug 30)
- Re: Did your BGP crash today? Gary Buhrmaster (Aug 30)
- Re: Did your BGP crash today? Thomas Mangin (Aug 28)
- Re: Did your BGP crash today? Florian Weimer (Aug 28)
- Re: Did your BGP crash today? Christopher Morrow (Aug 28)
- Re: Did your BGP crash today? Joel Jaeggli (Aug 29)
- Re: Did your BGP crash today? James Hess (Aug 28)