vconfig add eth1 2 ifconfig eth1.2 up brctl addbr vmbr2 brctl addif vmbr2 eth1.2
/etc/network/interfaces
auto vmbr2 iface vmbr2 inet manual bridge_ports eth1.2 bridge_stp off bridge_fd 0
ifconfig vmbr2 up
Проверка состояния:
cat /proc/net/vlan/config cat /proc/net/vlan/eth1.2