Subject: Bird3 - Establishing a BGP session over IPv6 LL addresses

[David Petera]

Hi Lucas,

just FYI the BMP protocol is kinda broken in v3.2, but we will release 
fixup version v3.2.1 (and 3.1.6) in a week.

If you wanted to try the fixes before the release you can download the 
package for you distro from the artifacts in our CI pipeline.
https://gitlab.nic.cz/labs/bird/-/pipelines/153438

Happy routing,
David

David Petera (he/him) | BIRD Tech Support | CZ.NIC, z.s.p.o.

On 3/26/26 22:10, Lucas da Vila wrote:
> Hi Alexander,
>
> I don't have a "protocol device" I was just hoping to receive the 
> announcements from the RR a get the BMP output for analysis.
>
> Regards
> lucas
>
>
> On Thu, Mar 26, 2026, 16:46 Alexander Zubkov <green at qrator.net> wrote:
>
>     Hi Lucas,
>
>     I have some working bgp sessions over link-local addresses. Only
>     that they are hand-configured, not automatic ones. And I have
>     bird2, not bird3. My config is something like this:
>
>     protocol bgp bgp_router_c6 {
>             neighbor fe80::2 as 65000;
>             local fe80::1 as 65000;
>             interface "vlan100";
>             direct;
>             strict bind yes;
>             free bind yes;
>
>             ipv6 {
>                     next hop keep; ...
>             };
>     }
>
>     "free bind" should not be necessary here, I think. Do you have
>     "protocol device" in your config?
>
>     Regards,
>     Alexander Zubkov
>
>     On Thu, Mar 26, 2026 at 8:21 PM Lucas da Vila <dev at ldv.ar> wrote:
>
>         Hi!
>
>         I'm a member of the DN42 network, and I have a mikrotik router
>         connected to it, I've only have 1 peer and I'm receiving over
>         MP-BGP IPv4 and IPv6 prefixes. Also on the mikrotik I'm
>         running a route-reflector.
>
>         With my bird3 (3.2.0 from debian repo) instance I'm trying to
>         connect to the route reflector over a couple of IPv6 LL
>         addresses. But it doesn't seem to be working. This is my bird3
>         config:
>
>         ```
>         router id 192.168.1.200;
>
>         log "/var/log/bird/bird.log" all;
>
>         protocol bgp mkt01_dn42_rr {
>                 description "mkt01 dn42 RR";
>                 # local 192.168.1.200 as 64512;
>                 local fe80::42e2:30ff:fe60:edbb%wlp2s0 as 64512;
>                 # neighbor 192.168.1.201 as 64512;
>                 neighbor fe80::2805%wlp2s0 as 64512;
>
>                 interface "wlp2s0";
>                 direct;
>                 strict bind yes;
>
>                 ipv4 {
>                         import all;
>                 };
>
>                 ipv6 {
>                         import all;
>                 };
>
>         }
>
>         protocol bmp {
>                 station address ip 127.0.0.1 port 5000;
>                 monitoring rib in pre_policy;
>                 monitoring rib in post_policy;
>         }
>         ```
>
>         After trying adding and removing params liks strict bind,
>         interface, etc I was not able to land a configuration that
>         finally worked.
>
>         I must say that over IPv4 the session was established, but
>         over IPv6 stills in Idle.
>
>         Is anyone out there with a similar config? Any ideas why this
>         happens?
>
>         Regards,
>         Lucas
>
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