Hello.

BFD is Not working normally.

My configuration is shown below.

OS: Ubuntu 18.04

Kernel: 4.15.0-54-generic

BIRD ver: 1.6.8

==================================

protocol bfd {
multihop {
min rx interval 300 ms;
min tx interval 300 ms;
multiplier 3;
};
}

protocol bgp as1 {
import all;
export all;

local ~ as ~;
neighbor ~ as ~;
enable route refresh off;
hold time 90;
bfd on;
}

protocol bgp as2 {
import all;
export all;

local ~ as ~;
neighbor ~ as ~;
enable route refresh off;
hold time 90;
bfd on;
}

==================================

After system reboot(# shutdown -r now), BGP neighbor is established, But BFD sessions are stuck in 'INIT' status. And BIRD does not send BFD packets.

BFD sessions have recovered after restart protocol bfd1(# birdc restart bfd1).

Is it a normal situation?

I think BFD has to start the mechanism after BGP neighbor is UP.

Is there any missing part of my configurations?

Please check it.

Regards