BFD sessions with FFR (VyOS) won't establish

[Lukas Haase via Bird-users]

Hello,

My BFD session between bird work fine but the ones but the ones to VyOS (which 
uses FFR) just won't connect:

# birdc show bfd sess
BIRD 2.0.8 ready.
bfd1:
IP address Interface State Since Interval Timeout
172.20.215.131 --- Init 10:39:14.183 1.000 10.000
172.20.215.130 --- Up 10:42:03.901 0.100 0.500

172.20.215.131 is here a VyOS box and its FFR config looks like:

!
bfd
peer 172.20.215.129 multihop local-address 172.20.215.131
detect-multiplier 10
transmit-interval 100
receive-interval 100
exit
!
exit
!
end


For reference, my bird config is trivially:

protocol bfd
{
interface "local-ibgp" {
min rx interval 100 ms;
min tx interval 100 ms;
idle tx interval 500 ms;
multiplier 10;
};
neighbor 172.20.215.130 local 172.20.215.129 multihop;
neighbor 172.20.215.131 local 172.20.215.129 multihop;
}


I have turned off firewall. What else could go wrong?


Thanks,
Luke