carp_up = "carp145.link.up"

state backup {
    init {
        run "/usr/local/sbin/birdc disable ospf1"
    }
    if $carp_up {
        set-state master
    }
}

state master {
    init {
        run "/usr/local/sbin/birdc enable ospf1"
    }
    if !$carp_up {
         set-state backup
    }
}