Help with Route Reflector and BGP multipath.

Arnaud Houdelette-Langlois arnaud.houdelette at normandie-univ.fr
Fri Mar 3 16:27:03 CET 2023


Thanks for your answer.
That's was an expected one, but as I send routes to another router and not to the kernel i would have expected that this would not have been an issue. I will try to update bird. 
Do you know if BSD port is up to date ?

Le 3 mars 2023 15:53:15 GMT+01:00, Marek Zarychta <zarychtam at plan-b.pwste.edu.pl> a écrit :
>W dniu 3.03.2023 o 14:30, Arnaud Houdelette-Langlois pisze:
>> 
>> Hi.
>> 
>> We are using bird for BGP/OSPF routing on our FreeBSD routers/firewalls for quite some time now.
>> 
>> I'm trying to setup linux server load-balancing using ExaBGP, and bird as Route-Reflectors.
>> 
>> Between the bird machines and linux servers, we got Force10 L3 switchs, also setup as route-reflector clients.
>> 
>> I have no problem setting up the BGP sessions, bird receives both routes from the 2 servers. But I can't manage to have the L3 switchs getting both routes in return.
>> 
>> birdc's "show route export bgp_sw3" only shows one of the 2 routes.
>> 
>> I tried enabling add-path without success. Maybe I'm missing something ?
>> 
>> Thanks for your help.
>> 
>> -- 
>> Arnaud Houdelette-Langlois
>> Administrateur des infrastructures systèmes et réseaux
>
>BIRD under FreeBSD supports multipath, but not the standard rtsock build. For achieving your aim you have to run BIRD 2.0.12 built with bsd-netlink target[1]. Building and running netlink flavor of BIRD under FreeBSD requires 13.2-RC1 or later.
>
>[1] https://bird.network.cz/pipermail/bird-users/2022-December/016412.html
>
>-- 
>Marek Zarychta
>
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