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

[Lucas da Vila]

Thanks David!

Good to know. I'll try to test the new version when it's available.
I'm no expert with BMP but it seemed odd to me that the received data (with
pmacct) was not really insightful.

Best regards,
Lucas

On Tue, Mar 31, 2026 at 10:15 AM David Petera via Bird-users <
bird-users at network.cz> wrote:

> 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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