wrtsl54gs:
root@OpenWrt:/etc# cat /proc/switch/eth0/vlan/0/ports
0       1       2       5u
root@OpenWrt:/etc# cat /proc/switch/eth0/vlan/1/ports
4       5t
root@OpenWrt:/etc# cat /proc/switch/eth0/vlan/2/ports
3       5t
wrt54g(2.0)
root@gollum:~# cat /proc/switch/eth0/vlan/0/ports
1       2       3       5t
root@gollum:~# cat /proc/switch/eth0/vlan/1/ports
0       5t
root@gollum:~# cat /proc/switch/eth0/vlan/2/ports
4       5t*