iface xen-br112 inet manual
    up vconfig add eth2 112
    up /etc/xen/scripts/network-bridge start netdev=eth2.112 bridge=xen-br112 antispoof=no
    up /sbin/ifconfig eth2.112 up
    down /etc/xen/scripts/network-bridge stop netdev=eth2.112 bridge=xen-br112 antispoof=no
    down vconfig rem eth2.112