How to make bird and freebsd carp working together ?

[Arnaud Houdelette-Langlois]

Hi

I got two routers running freebsd (BSDRP).

Those two are used as redundant site firewalls and main routers / route 
servers.

Both exchange routes between themselves and other routers using Bird 
(OSPF+BGP).

Both serve as gateway for our management network, with carp enabled.

I got trouble making CARP and BIRD working together.

The carp enabled interface use a dummy network for exchanging carp info 
(link local adresses : 169.254.1.0/24)

Bird Device protocol does not makes any difference between adresses in 
MASTER or BACKUP vhids, so the route appears in both routers.

I tried with recent "learn all" feature of kernel protocol : There, bird 
only picks up route when its master, but, in case of MASTER failover or 
preemption, it doesn't remove the route early enough, and freebsd does 
not seem to replace the route on it’s kernel table, so when birds 
finally removes the route, we end up with no route at all. (and a non 
working network segment).

Am I the only one facing this issue ? Is there a way to make bird carp 
aware ?


Thanks

-- 
Arnaud Houdelette-Langlois
Administrateur des infrastructures systèmes et réseaux
Normandie Université
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