Administrator Guide

Information contained in the tag header allows the system to prioritize traffic and to forward information to ports associated with a
specific VLAN ID. Tagged interfaces can belong to multiple VLANs, while untagged interfaces can belong only to one VLAN.
Configuration Task List
This section contains the following VLAN configuration tasks.
• Creating a Port-Based VLAN (mandatory)
• Assigning Interfaces to a VLAN (optional)
• Assigning an IP Address to a VLAN (optional)
• Enabling Null VLAN as the Default VLAN
Creating a Port-Based VLAN
To configure a port-based VLAN, create the VLAN and then add physical interfaces or port channel (LAG) interfaces to the VLAN.
NOTE: The Default VLAN (VLAN 1) is part of the system startup configuration and does not require configuration.
A VLAN is active only if the VLAN contains interfaces and those interfaces are operationally up. As shown in the following example, VLAN
1 is inactive because it does not contain any interfaces. The other VLANs contain enabled interfaces and are active.
NOTE: In a VLAN, the shutdown command stops Layer 3 (routed) traffic only. Layer 2 traffic continues to pass through
the VLAN. If the VLAN is not a routed VLAN (that is, configured with an IP address), the shutdown command has no
affect on VLAN traffic.
When you delete a VLAN (using the no interface vlan vlan-id command), any interfaces assigned to that VLAN are assigned to
the Default VLAN as untagged interfaces.
To create a port-based VLAN, use the following command.
• Configure a port-based VLAN (if the VLAN-ID is different from the Default VLAN ID) and enter INTERFACE VLAN mode.
CONFIGURATION mode
interface vlan vlan-id
To activate the VLAN, after you create a VLAN, assign interfaces in Layer 2 mode to the VLAN.
To view the configured VLANs, use the show vlan command in EXEC Privilege mode.
DellEMC#show vlan
Codes: * - Default VLAN, G - GVRP VLANs
NUM Status Q Ports
* 1 Inactive U So 9/4-11
2 Active U Gi 1/1,18
3 Active U Gi 1/2,19
4 Active T Gi 1/3,20
5 Active U Po 1
6 Active U Gi 1/12
U So 9/0
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, see 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 EMC Networking OS Command Reference Guide.
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Virtual LANs (VLANs)