config device
  option name dsabridge
  option type bridge
  option ifname "lan1 lan2 lan3 lan4"

config bridge-vlan
  option device dsabridge
  option vlan 100
  list ports lan1:t*
  list ports lan2:t*
  list ports lan3:t
  list ports lan4

config bridge-vlan
  option device dsabridge
  option vlan 200
  list ports lan4:t*