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Hello Michael.<BR>
<BR>
Thanks for the info; very useful. <BR>
<BR>
Considering this, could we say BGP is faster removing routes when<BR>
session is lost/closed/shut down than when they are added?<BR>
<BR>
Even though you start receiving traffic right away you setup a BGP<BR>
session, we have seen it takes hours (even days) to fully propagate new<BR>
BGP upstream we added in the past.<BR>
<BR>
Did you find this behavior too?<BR>
<BR>
Thanks Michael.<BR>
Best Regards.<BR>
<BR>
<BR>
PD: Just to clarify point 2) Another solution is to just shutdown BGP<BR>
session but leave upstream connected and configured (so outdated<BR>
routers we still reach us...) <B>AND unplug the cable after traffic disappears.</B><BR>
<BR>
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We are using option number 2.
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<BR>
<BR>
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After 600 seconds, all routes via the shutted down peer will get invalid.
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<BR>
<BR>
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So just wait 10 Minutes and your inbound traffic should stop.
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<BR>
<BR>
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.........
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<BR>
<BR>
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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.
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<BR>
<BR>
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<BR>
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Am Sa., 8. Dez. 2018, 04:03 hat Francis Brosnan Blázquez <<A HREF="mailto:francis.brosnan@aspl.es">francis.brosnan@aspl.es</A>> geschrieben:<BR>
<BR>
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Hello.<BR>
<BR>
We are using bird with several upstream providers, all of them with a<BR>
share of traffic.<BR>
<BR>
We are in the process of shutting down one of them but we are unsure<BR>
how to proceed to minimize loss of traffic.<BR>
<BR>
We have been reading and looking for general recommendations but it is<BR>
not clear (besides using graceful shutdown which is not supported by<BR>
the upstream we want to shutdown).<BR>
<BR>
We have been looking at mailing list but we haven't found anything<BR>
treating this matter.<BR>
<BR>
So far, solutions we have come up are:<BR>
<BR>
1) Use AS-path prepend to increase metric on the uptstream to be<BR>
shutted down and once nearly no traffic comes in through that link, shutdown<BR>
BGP and unplug. Something like:<BR>
<BR>
export filter { <BR>
<BR>
if source = RTS_STATIC then { # Export only static routes <BR>
# Assign our community <BR>
bgp_community.add((65000,64501)); <BR>
# Artificially increase path length <BR>
# by advertising local AS number twice <BR>
if bgp_path ~ [= 65000 =] then <BR>
bgp_path.prepend(65000);<BR>
bgp_path.prepend(65000);<BR>
accept; <BR>
} <BR>
reject; <BR>
}; <BR>
<BR>
2) Another solution is to just shutdown BGP session but leave upstream<BR>
connected and configured (so outdated routers we still reach us...).<BR>
<BR>
3) And the obvious, just shutdown BGP session and unplug the cable.<BR>
<BR>
It would be great to know your opinion and what's the recommended way<BR>
to proceed. <BR>
<BR>
What do you think?<BR>
<BR>
Many thanks<BR>
Best Regards.<BR>
<BR>
<BR>
<BR>
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<PRE>
--
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
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