init-state auto

if_carp_up="carp157.link.up"
if_carp_down="carp157.link.down"

state auto {
    if $if_carp_up {
        set-state master
    }
    if $if_carp_down {
        set-state backup
    }
}

state master {
    init {
        run "route delete default && route add default 37.16.96.145"
    }
    if $if_carp_down {
        set-state backup
    }
}

state backup {
    init {
        run "route delete default && route add default 172.20.20.1"
    }
    if $if_carp_up {
        set-state master
    }
}