| Thanks for your reply.. I figured out how to use two ports of my wrt54gl as vlan1 and vlan2. It works just fine. I used DD-WRT for this to work.
 The router is acting as a smart switch providing internet to the nanostationm2 or airgridm2 setup as internet gateway. In case someone needs to use a spare wrt54gl as a managed switch, here is a simple setup: 1- do a hard reset. 2- go to SETUP-> VLANS
 3- move the wan port to vlan 2 4- click apply.(wait 1 minute before continuing).
 5- go to SETUP -> Networking page
 6-  change the "WAN Port Assignment" from "vlan1" to "vlan2". If there is no "vlan2", reboot the router and check again.
 7- Press the apply button
 8- go to SETUP -> VLANS
 9-  Move the desired ports from "vlan0" to "vlan1". I used ports 3 and 4 to provide vlans to ubiquiti routers. You can select two or one port to use as vlan, it is up to you. 10- Change Assigned to Bridge settings for vlan1 to LAN
 11- Press the apply button and wait one minute before continuing.  12- go to SETUP -> Networking page and verify that the vlan1 interface is assigned to the br0
 12- Click save and apply settings.
 13- go to setup -> networking page and change "WAN port to Assignment " from "vlan1" to "vlan2" and press apply. 14- go to Administration -> commands and save the following script.         nvram set wan_ifname=vlan2         startservice wan Wait two minutes and reboot the router... very important.
 15 - go to SETUP -> VLANS 16- Scroll down to "Tagged" and select the ports you selected in step 9 as vlan1. For me I selected ports 3 and 4. 17- Press apply button and wait 2 minutes. After this I was able to assign ports 3 and 4 as vlans and ports 2 and 1 were still working as traditional LAN ports. I also tried the same setup by assigning just port 4 as vlan1 and the 3 other LAN ports were still working just fine. Port 4 provided internet to any Ubiquiti device with one or two LAN ports. Enjoy.. 
 Credits to : DD-WRT tutorial on how to configure VLANS for 802.1q compability. web page: www.dd-wrt.com/wiki/index.php/Reconfigure_VLANs_for_802.1q_Compability 
 
 
 that is it... now you can plug the nanostation, the bullet or the airgrid lan ethernet cable into port 3 or 4 and it will act as a vlan. Beware !!! I can ping my router ip from different nodes. I can access my router GUI from any node in my network..  I think this is a bit scary if you open your network to everybody in a given community network... Enjoy..
 
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