nanog mailing list archives
Re: Did your BGP crash today?
From: Thomas Mangin <thomas.mangin () exa-networks co uk>
Date: Sun, 29 Aug 2010 22:12:35 +0200
It would seem to me that there should actually be a better option, e.g. recognizing the malformed update, and simply discarding it (and sending the originator an error message) instead of resetting the session. Resetting of BGP sessions should only be done in the most dire of circumstances, to avoid a widespread instability incident.
I had the same thought before giving up on it. Negotiating a new error message could be a per peer option. BGP has capabilities for this exact reason. However to make sense you would need to find a resynchronisation point to only exclude the one faulty message. Initially I thought that the last received KEEPALIVE (for the receiver of the error message) could do - but you find yourselves with races conditions - so perhaps two KEEPALIVE back ? Each TCP packet can contain multiple message, so the messages would have to be then split and ACK individually to find the faulty one and then ACK individually. EOR could be used for that purpose. Still it adds lots of complexity in the conversation - are we not going to introduce bug in that not much used and tested code path as well ? Unless you have a new "ACK" capability for each message - another idea but those are clearly a discussions for outside NANOG. Thomas
Current thread:
- Re: Did your BGP crash today?, (continued)
- Re: Did your BGP crash today? Raymond Dijkxhoorn (Aug 28)
- Re: Did your BGP crash today? Thomas Mangin (Aug 28)
- Re: Did your BGP crash today? Thomas Mangin (Aug 28)
- Re: Did your BGP crash today? Claudio Jeker (Aug 28)
- Re: Did your BGP crash today? Brett Frankenberger (Aug 28)
- Re: Did your BGP crash today? Mikael Abrahamsson (Aug 29)
- Re: Did your BGP crash today? Randy Bush (Aug 29)
- 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)