auto lo
iface lo inet loopback

auto vlan60
iface vlan60 inet manual
    up ip link set up dev vlan60
    up ip addr add 10.1.60.21/24 brd + dev vlan60
    up ip route add default via 10.1.60.1 dev vlan60
    down ip addr del 10.1.60.21/24 dev vlan60
    down ip link set down dev vlan60