Клиенты подключены 1-ми vLAN-ами к портам 2 и 3.
Весь траффик уходит/приходит в на 1-й порт.

Выдержка из файла конфигурации /etc/network/interfaces :

auto br1
iface br1 inet static
    address 10.11.126.200
    netmask 255.255.255.0
    pre-up ip link set eth1 up
    pre-up ip link set eth2 up
    pre-up ip link set eth3 up
    pre-up vconfig add eth2 1
    pre-up vconfig add eth3 1
    pre-up ip link set eth2.1 up
    pre-up ip link set eth3.1 up
    pre-up brctl addbr br1
    pre-up brctl addif br1 eth1
    pre-up brctl addif br1 eth2.1
    pre-up brctl addif br1 eth3.1
    post-down brctl delif br1 eth1
    post-down brctl delif br1 eth2.1
    post-down brctl delif br1 eth3.1
    post-down brctl delbr br1
    post-down ip link set eth2.1 down
    post-down ip link set eth3.1 down
    post-down vconfig rem eth2.1
    post-down vconfig rem eth3.1