shutdown BGP sessions without administrative shutdown?

[Tim Meusel]

Hi,

On 23.02.21 00:12, Alexander Zubkov wrote:
> 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.
> 

Thanks! That works perfectly fine for bird 2. Is that also possible with
bird 1.6? It lists support for LLGR in the configuration documentation:
https://bird.network.cz/?get_doc&v=16&f=bird-6.html#ss6.3

But the remote control documentation does not list `graceful restart`
and it indeed doesn't work:

# birdc graceful shutdown
BIRD 1.6.8 ready.
No such command. Press `?' for help.

Cheers, Tim

> 
> 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
>>
>>

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