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Dell PowerEdge FN I/O Module Configuration Guide 9.10(0.0)

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Assigning Interfaces to a VLAN

You can only assign interfaces in Layer 2 mode to a VLAN using the tagged and untagged commands. To place an interface in Layer 2 mode, use the switchport command.

You can further designate these Layer 2 interfaces as tagged or untagged. For more information, refer to the Interfaces chapter and Configuring Layer 2 (Data Link) Mode . When you place an interface in Layer 2 mode by the switchport command, the interface is automatically designated untagged and placed in the Default VLAN.

To view which interfaces are tagged or untagged and to which VLAN they belong, use the show vlan command. The following example shows that six VLANs are configured, and two interfaces are assigned to VLAN 2. The Q column in the show vlan command example notes whether the interface is tagged (T) or untagged (U). For more information about this command, refer to the Layer 2 chapter of the Dell Networking OS Command Reference Guide .

To tag frames leaving an interface in Layer 2 mode, assign that interface to a port-based VLAN to tag it with that VLAN ID. To tag interfaces, use the following commands.

  1. Access INTERFACE VLAN mode of the VLAN to which you want to assign the interface. CONFIGURATION mode interface vlan vlan-id
  2. Enable an interface to include the IEEE 802.1Q tag header. INTERFACE mode tagged interface

Add an Interface to Another VLAN

To view just the interfaces that are in Layer 2 mode, use the show interfaces switchport command in EXEC Privilege mode or EXEC mode.

The following example shows the steps to add a tagged interface (in this case, port channel 1) to VLAN 4. To view the interface’s status. Interface (po 1) is tagged and in VLAN 2 and 3, use the show vlan command. In a port-based VLAN, use the tagged command to add the interface to another VLAN. The show vlan command output displays the interface’s (po 1) changed status.

Except for hybrid ports, only a tagged interface can be a member of multiple VLANs. You can assign hybrid ports to two VLANs if the port is untagged in one VLAN and tagged in all others. 

Dell#show vlan
                                 
                                 Codes: * - Default VLAN, G - GVRP VLANs
                                 
                                 NUM Status Q Ports
                                 * 1 Inactive
                                 2 Active   T Po1(So 0/0-1)
                                 T Tengig 3/0
                                 3 Active   T Po1(So 0/0-1)
                                 T Tengig 3/1
                                 Dell#config
                                 Dell(conf)#int vlan 4
                                 Dell(conf-if-vlan)#tagged po 1
                                 Dell(conf-if-vlan)#show conf
                                 !
                                 interface Vlan 4
                                 no ip address
                                 tagged Port-channel 1
                                 Dell(conf-if-vlan)#end
                                 Dell#show vlan
                                 
                                 Codes: * - Default VLAN, G - GVRP VLANs
                                 NUM Status Q Ports
                                 * 1 Inactive
                                 2 Active   T Po1(So 0/0-1)
                                 T Tengig 3/0
                                 3 Active   T Po1(So 0/0-1)
                                 T Tengig 3/1
                                 4 Active T Po1(So 0/0-1)
                                 Dell#

When you remove a tagged interface from a VLAN (using the no tagged interface command), it remains tagged only if it is a tagged interface in another VLAN. If the tagged interface is removed from the only VLAN to which it belongs, the interface is placed in the Default VLAN as an untagged interface.

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