Device Online Help

Configuring a VLAN to accept tagged or untagged frames

To configure a VLAN to accept tagged or untagged frames from a port:

1. In the Device Manager Main window, select the port.

The port is highlighted.

2. From the Device Manager menu bar, choose Edit > Port.

The Port dialog box opens to the Interface tab. The tab label may vary, depending on the module that you selected.

3. Click the VLAN tab.

The VLAN tab opens.

4. To configure tagging on the port, click the PerformTagging field. This setting is applied to all VLANs associated with the port.

If the box is checked, tagging is enabled. All frames sent from this port are tagged. You can either discard the tagged frames (go to Step 5) or forward them to a VLAN (go to Step 6).

• If the box is unchecked, tagging is disabled. The port does not send tagged frames. The switch removes the tag before sending the frame out the port. You can either discard the untagged frames (go to Step 5) or forward them to a VLAN (go to Step 6).
  
  

  Note: When you enable tagging on an untagged port, the port's previous configuration of VLANs, STGs, and MLTs is lost. In addition, the port resets and runs Spanning Tree Protocol, thus breaking connectivity while the protocol goes through the normal blocking and learning states before the forwarding state.

  
  
5. Do one of the following:
• To discard tagged frames on a port for which tagging is disabled, click DiscardTaggedFrames.
• To discard untagged frames on a port for which tagging is enabled, click DiscardUntaggedFrames.
  
  

  Note: To optimize performance, on untagged ports in configurations where you do not expect to see tagged frames, you should set DiscardTaggedFrames to true. However, on untagged ports for interconnecting switches, it is probably better to set DiscardTaggedFrames to false.

  
  
6. To designate a default VLAN to associate with discarded frames, enter a VLAN ID in the Default VLAN ID field (or use the default VLAN 1).
7. Click Apply > Close.

Tagging is configured for the port.

• Treatment of tagged and untagged frames
• Configuring advanced VLAN features
• About VLANs
• Configuring MAC address auto-learning on a VLAN
• Modifying auto-learned MAC addresses
• Displaying defined VLANs