> robocfg show
1: vlan1: 1 2 3 5t
2: vlan2: 0 5
6: vlan6: 0t 4

vlan1 and vlan2 were default ones, I added vlan6.
Port 0 is WAN, port 5 is CPU, port 1,2,3,4 - LAN ports.

Commands to create a bridge:
> vconfig add eth0 6
> ifconfig vlan6 up
> brctl addbr br6
> brctl addif br6 eth0
> brctl addif br6 vlan6