Setup VLAN on wnr2000v3 (Athero AR7241, ddwrt r24160 )

wnr2000v3 configuration:

LAN1-LAN4 (switch chip)   <—-> eth1—-CPU—eth0 <—> WAN

A separate switch chip is used out of route CPU

The switch is initialized in Uboot,  and  can be configured via swconfig command in ddwrt.