shutdown BGP sessions without administrative shutdown?

[Alexander Zubkov]

Hi,

As far as I know, when you shut down bird manually, you have to use
"graceful restart" command to stop it instead of "down" command:
https://bird.network.cz/?get_doc&v=20&f=bird-4.html#cli-graceful-restart
And also use "-R" option for the daemon when starting.


On Mon, Feb 22, 2021 at 10:25 PM Tim Meusel <bird at bastelfreak.de> wrote:
>
>
>
> Hi!
> I'm running many boxes with Bird 2.x. They all peer with virtual JunOS
> routers via BGP. Each Bird instance announces routes for IP addresses
> from local virtual machines. In case bird dies or gets stopped for
> upgrades, I want that the JunOS route reflectors keep the routes for a
> certain amount of time. My config currently looks like this:
>
> template bgp VMX {
>   local $ip as $as;
>   multihop;  # we don't have a layer 2 connection to the routers
>   bfd graceful;
>   hold time 240;
>   startup hold time 240;
>   connect retry time 120;
>   graceful restart yes;
>   graceful restart time 0;
>   long lived graceful restart yes;
>   long lived stale time 90;
>   ipv4 {
>     export filter virtual_machines_v4;
>     import none;
>     next hop self;
>   };
>   ipv6 {
>     export filter virtual_machines_v6;
>     import none;
>     next hop self;
>   };
> }
>
> protocol bgp $peer from VMX {
>   description $desc;
>   neighbor $ip> as $as;
> }
>
> this works fine if I do:
> * birdc reconfigure
> * kill -HUP on the bird pid
> * killall -9 bird
>
> however if I do a `systemctl stop bird`, it does an  administrative
> shutdown and the virtual MX drops the routes. As far as I understand the
> RFC for LLGR this is the correct behavior. Can one of you tell me if
> there is an option on JunOS to keep the routes, even after a `
> administrative shutdown`, or if I can advice Bird to not cleanly
> shutdown sessions?
>
> Cheers, Tim
>
>