Recommended way to shutdown a working BGP session -- ordered bgp session stop -- bgp session shutdown

[Michael Rack]

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 at 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 connected and configured (so outdated routers we still reach us...).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 at aspl.es>
> ASPL -- Advanced Software Production Line, S.L.
>
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