Recommended way to shutdown a working BGP session -- ordered bgp session stop -- bgp session shutdown
Francis Brosnan Blázquez
francis.brosnan at aspl.es
Mon Dec 10 10:47:32 CET 2018
Hello Kurt.
By your solution, would it be possible to announce no prefix over the
upstream that you want to shutdown (export none;)?
About "local preference", I thought it is only applicable for IBGP not
for EBGP but it seems it can now be used for eBGP neighbors (as
described by allow bgp_local_pref switch at bird BGP doc).
We will keep you updated with our results so others can take advantage
of them too.
Best Regards.
> You could announce more specific routes on the upstream that you want
> to keep and make sure you're outgoing traffic goes via the upstream
> you want to keep by example higher local pref.
>
>
>
> kurt
>
>
>
> Op vr 7 dec. 2018 22:53 schreef Francis Brosnan Blázquez
> <francis.brosnan at aspl.es:
>
> 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 connected and configured (so outdated routers we still reach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/
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