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

[Lucas da Vila]

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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