Hi Christian,
BFD strict mode is not supported in BIRD right now, but it is certainly
on our backlog.
However it will not happen this year since we are prioritizing other
stuff (e.g. BIRD API and implementation of EVPN).
If you know of someone that would be interested in sponsoring the
development of BFD strict mode, we would be able to finish it ~Q3-Q4 of
this year (estimation rn).
In such case, hit us up on *[email protected] *to discuss the details.
Happy routing,
David
David Petera (he/him) | BIRD Tech Support | CZ.NIC, z.s.p.o.
On 2/10/26 15:56, Christian Ruppert via Bird-users wrote:
Hi list,
is it possible to add BFD strict mode support? Or is it possible to
let bird behave like this already with some workarounds by chance?
It looks like both sides must support that in order to get it working:
Both peers must advertise support for strict-BFD capability for
strict behavior to take effect on that session.
Right now it seems like BFD + BGP is kinda useless because when we
drop BFD packets for example, to simulate an outage, even tho the BFD
session is going down, BGP stays up and still exports routes etc. We
have configured bfd into our bgp template / config in bird:
template bgp bfd_bgp_v6 {
description "IPv6 BGP";
local ... as 1337;
strict bind yes;
hold time 90;
keepalive time 30;
bfd;
ipv6 {
next hop self;
import filter {
reject "No import on LB!";
};
export where lb_export();
};
}
protocol bfd {
accept direct;
neighbor ...
neighbor ...
...
};
I *might* also be able to arrange either some money donation for the
project and/or an individual developer, whatever is preferred.
https://datatracker.ietf.org/doc/draft-ietf-idr-bgp-bfd-strict-mode/
https://supportportal.juniper.net/s/article/BFD-strict-mode-for-BGP-peer-sessions
https://www.juniper.net/documentation/us/en/software/junos/high-availability/topics/topic-map/bfd.html#id-understanding-bfd-for-bgp__d11e136
https://www.juniper.net/documentation/us/en/software/junos/bgp/topics/topic-map/bfd-for-bgp-session.html#platform-specific-behavior
