I use a Netgear 48-port switch GS748T. I'm trying since yesterday to configure VLANs. So I added different vlans associated with their ID knowing the VLANs type is port-based.

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After associating ports such as VLANs and saved my configuration, when I go to the page that allows me to view the MAC address table, I notice that all ports are always associated to the VLAN 1 (default), as you can see in the picture below, while some should be associated with vlan 2, in this example.

enter image description here

How to solve this problem and allow these ports to be associated to the VLAN n°2?

  • What steps did you take to associate a port with a VLAN?
    – Ron Maupin
    Oct 16, 2015 at 16:07
  • @RonMaupin 1. Add a new vlan, 2. In vlan Membership, click on the port I want to be associated to the vlan. And still all ports are associated to the default vlan and not the new vlan (for the port I want to change the vlan)
    – w3sic3
    Oct 16, 2015 at 16:17
  • According to the manual, you click on the VLAN ID, select the ports you wish to be in that VLAN, then click Apply to activate it. That is for access ports. You aren't trying to add these at 802.1Q Tag VLAN ports are you?
    – Ron Maupin
    Oct 16, 2015 at 17:08
  • @RonMaupin Indeed, I haven't tried the second option, but as the port-based doesn't seem to work (I have followed the documentation), maybe I have to use the IEEE 802.1Q encapsultation ?
    – w3sic3
    Oct 16, 2015 at 17:15
  • Using the tagging feature will create a trunk port, and I doubt you want that. You may need to contact the manufacturer. You may have a bad code version that needs to be upgraded.
    – Ron Maupin
    Oct 16, 2015 at 17:18

2 Answers 2


First, you might be experiencing a bug which doesn't show the proper VLANs port membership, so check this out and see if a different browser helps: http://kb.netgear.com/app/answers/detail/a_id/23841/~/the-vlan-and-lag-configuration-screens-do-not-display-correctly-on-my-switch.

Second, make sure you are adding the VLANs correctly by verifying with the user guide that you have done the required steps properly. You can find the user guide on the GS748T Downloads Page.

If this still isn't working, I would suggest trying 801.q VLANs. The important thing to know when using 802.1q VLANs, is to set each port to "untagged" mode, assign a VLAN, and set the PVID per-port to the same VLAN ID. This should allow you to create separate VLANs on your Netgear switch. Make sure you keep at least one port on VLAN 1 so that you can still connect to the management interface. Of course make sure you have a router that can route between these separate networks, and either connect a port from each VLAN into this router, or create a "tagged" port carrying multiple VLANs to this device.

  • OW Thank you very much for your answer ! What a joy to see properly (with Firefox 3.5.6). Thank you for your answer very detailled !
    – w3sic3
    Oct 16, 2015 at 18:56

For thoses having the vlan membership bug on modern browsers and not willing to use and outdated browser, here's a little trick :

  • Open the switch web admin panel
  • Open the developer console
  • Paste IXML.serialize = function(d) { return d?d.outerHTML:null; } in the console to overwrite their buggy function

The VLAN membership/LAG membership pages should be working now.

Best, Thomas

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