W dniu 1.04.2024 o 00:50, Arnaud Houdelette-Langlois via Bird-users pisze:
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 ?
Sure, the best way to let BIRD know that CARP state has changed is to
deploy devd(8):
# /etc/devd/carp.conf
notify 0 {
match "system" "CARP";
match "subsystem" "[0-9]+@[0-9a-z]+";
match "type" "(MASTER|BACKUP)";
action "/root/bin/carpcontrol.sh $subsystem $type";
};
# /root/bin/carpcontrol.sh
#!/bin/sh
subsystem=$1
type=$2
vhid="6"
c_if="vlanX" # CARP interface1
(...)
bird_remove_routes() {
here change configs, reconfigure bird etc
}
bird_add_routes() {
here change configs, reconfigure bird etc
}
if [ "$subsystem" = "$vhid@$c_if" ]; then
case $type in
"MASTER")
bird_add_routes
;;
"BACKUP")
bird_remove_routes
;;
esac
fi
Happy routing !
Cheers
--
Marek Zarychta
