Recommended way to shutdown a working BGP session -- ordered bgp session stop -- bgp session shutdown
Hello. We are using bird with several upstream providers, all of them with a share of traffic. We are in the process of shutting down one of them but we are unsure how to proceed to minimize loss of traffic. We have been reading and looking for general recommendations but it is not clear (besides using graceful shutdown which is not supported by the upstream we want to shutdown). We have been looking at mailing list but we haven't found anything treating this matter. So far, solutions we have come up are: 1) Use AS-path prepend to increase metric on the uptstream to be shutted down and once nearly no traffic comes in through that link, shutdown BGP and unplug. Something like: export filter { if source = RTS_STATIC then { # Export only static routes # Assign our community bgp_community.add((65000,64501)); # Artificially increase path length # by advertising local AS number twice if bgp_path ~ [= 65000 =] then bgp_path.prepend(65000); bgp_path.prepend(65000); accept; } reject; }; 2) Another solution is to just shutdown BGP session but leave upstream connected and configured (so outdated routers we still reach us...). 3) And the obvious, just shutdown BGP session and unplug the cable. It would be great to know your opinion and what's the recommended way to proceed. What do you think? Many thanks Best Regards. -- Francis Brosnan Blázquez <francis.brosnan@aspl.es> ASPL -- Advanced Software Production Line, S.L.
We are using option number 2. After 600 seconds, all routes via the shutted down peer will get invalid. So just wait 10 Minutes and your inbound traffic should stop. ......... But there was a another thread with a feature request to send withdraws to your peer, so you can immediatley shutdown your network interface after shutting down the bgp session. Am Sa., 8. Dez. 2018, 04:03 hat Francis Brosnan Blázquez < francis.brosnan@aspl.es> geschrieben:
Hello.
We are using bird with several upstream providers, all of them with a share of traffic.
We are in the process of shutting down one of them but we are unsure how to proceed to minimize loss of traffic.
We have been reading and looking for general recommendations but it is not clear (besides using graceful shutdown which is not supported by the upstream we want to shutdown).
We have been looking at mailing list but we haven't found anything treating this matter.
So far, solutions we have come up are:
1) Use AS-path prepend to increase metric on the uptstream to be shutted down and once nearly no traffic comes in through that link, shutdown BGP and unplug. Something like:
export filter {
if source = RTS_STATIC then { # Export only static routes
# Assign our community
bgp_community.add((65000,64501));
# Artificially increase path length
# by advertising local AS number twice
if bgp_path ~ [= 65000 =] then
bgp_path.prepend(65000); bgp_path.prepend(65000);
accept;
}
reject;
};
2) Another solution is to just shutdown BGP session but leave upstream connected and configured (so outdated routers we still reach us...).
3) And the obvious, just shutdown BGP session and unplug the cable.
It would be great to know your opinion and what's the recommended way to proceed.
What do you think?
Many thanks Best Regards.
-- Francis Brosnan Blázquez <francis.brosnan@aspl.es> ASPL -- Advanced Software Production Line, S.L.
Hello Michael. Thanks for the info; very useful. Considering this, could we say BGP is faster removing routes when session is lost/closed/shut down than when they are added? Even though you start receiving traffic right away you setup a BGP session, we have seen it takes hours (even days) to fully propagate new BGP upstream we added in the past. Did you find this behavior too? Thanks Michael. Best Regards. PD: Just to clarify point 2) Another solution is to just shutdown BGP session but leave upstream connected and configured (so outdated routers we still reach us...) AND unplug the cable after traffic disappears.
We are using option number 2.
After 600 seconds, all routes via the shutted down peer will get invalid.
So just wait 10 Minutes and your inbound traffic should stop.
.........
But there was a another thread with a feature request to send withdraws to your peer, so you can immediatley shutdown your network interface after shutting down the bgp session.
Am Sa., 8. Dez. 2018, 04:03 hat Francis Brosnan Blázquez <francis.brosnan@aspl.es> geschrieben:
Hello.
We are using bird with several upstream providers, all of them with a share of traffic.
We are in the process of shutting down one of them but we are unsure how to proceed to minimize loss of traffic.
We have been reading and looking for general recommendations but it is not clear (besides using graceful shutdown which is not supported by the upstream we want to shutdown).
We have been looking at mailing list but we haven't found anything treating this matter.
So far, solutions we have come up are:
1) Use AS-path prepend to increase metric on the uptstream to be shutted down and once nearly no traffic comes in through that link, shutdown BGP and unplug. Something like:
export filter {
if source = RTS_STATIC then { # Export only static routes # Assign our community
bgp_community.add((65000,64501)); # Artificially increase path length # by advertising local AS number twice if bgp_path ~ [= 65000 =] then bgp_path.prepend(65000); bgp_path.prepend(65000);
accept; }
reject; };
2) Another solution is to just shutdown BGP session but leave upstream connected and configured (so outdated routers we still reach us...).
3) And the obvious, just shutdown BGP session and unplug the cable.
It would be great to know your opinion and what's the recommended way to proceed.
What do you think?
Many thanks Best Regards.
-- Francis Brosnan Blázquez - ASPL http://www.asplhosting.com/ http://www.aspl.es/ https://twitter.com/aspl_es https://twitter.com/asplhosting https://twitter.com/francisbrosnanb https://es.linkedin.com/in/francis-brosnan-blázquez-1353a218 91 134 14 22 - 91 134 14 45 - 91 116 07 57 Av. Juan Carlos I 13, 2ºC, Torre Garena 28806 - Alcalá de Henares (España) AVISO LEGAL En virtud de lo dispuesto en la Ley Orgánica 15/1999, de 13 de diciembre, de Protección de Datos de Carácter Personal, le informamos de que sus datos de carácter personal, recogidos de fuentes accesibles al público o datos que usted nos ha facilitado previamente, proceden de bases de datos propiedad de Advanced Software Production Line, S.L. (ASPL). ASPL garantiza que los datos serán tratados con la finalidad de mantener las oportunas relaciones comerciales o promocionales con usted o la entidad que usted representa. No obstante, usted puede ejercitar sus derechos de acceso, rectificación, cancelación y oposición dispuestos en la mencionada Ley Orgánica, notificándolo por escrito a ASPL - Protección Datos, Av. Juan Carlos I 13, 2ºC, Alcalá de Henares (Madrid).
participants (2)
-
Francis Brosnan Blázquez -
Michael Rack