BGP with BIRD2 and MikroTik CCR1072-1G-8S+

[Kees Meijs | Nefos]

Hi Ondrej,

Thank you very much.

For as test I removed the IPv6 channel and sniffed the packets again. As 
you expected IPv4 AFI was listed and (after fixing the MikroTik IPv6 
AFI, obviously) stuff kept working.

Very likely I didn't have channels, early in the process.

Cheers,
Kees

On 18-06-2021 17:13, Ondrej Zajicek wrote:
> On Fri, Jun 18, 2021 at 11:12:39AM +0200, Kees Meijs | Nefos wrote:
>> Hi list,
>>
>> Using tcpdump(8) I was able to pin point the issue.
>>
>> Please note the difference (BIRD):
>>
>>> Optional parameters, length: 8
>>>          Option Capabilities Advertisement (2), length: 6
>>>            32-Bit AS Number (65), length: 4
>>>           4 Byte AS REDACTED
>>>          0x0000:  0000 9b06
>>
>> and the MikroTik:
>>
>>> Optional parameters, length: 16
>>>          Option Capabilities Advertisement (2), length: 14
>>>            Route Refresh (2), length: 0
>>>            32-Bit AS Number (65), length: 4
>>>           4 Byte AS REDACTED
>>>          0x0000:  0003 280d
>>>            Multiprotocol Extensions (1), length: 4
>>>          AFI IPv4 (1), SAFI Unicast (1)
>>>          0x0000:  0001 0001
>> I can work around the problem by adding a IPv4 and IPv6 channel and enable
>> IPv6 on the MikroTik as well.
>>
>> Is it possible to configure BIRD2 to enforce Multiprotocol Extensions when
>> only IPv4 is in use?
> Hi
>
> Perhaps you have no channel configured? AFAIK if there is only IPv4
> channel, BIRD still announces multiprotocol capability with IPv4 AFI.
>
>
>> I suspected the ver=4 is the problem so I've added:
>>>   advertise ipv4 off;
>> But alas, BIRD2 is now complaining:
>
> Seems like a bug in documentation, this option was removed during
> bird1 -> bird2 transition, but should not matter.
>