Default VLANWhen you configure interfaces for Layer 2 mode, they are automatically placed in the Default VLAN as untagged interfaces. Only untaggedinterfaces can belong to the Default VLAN.The following example displays the outcome of placing an interface in Layer 2 mode. To configure an interface for Layer 2 mode, use theswitchport command. As shown in bold, the switchport command places the interface in Layer 2 mode and the show vlancommand in EXEC privilege mode indicates that the interface is now part of the Default VLAN (VLAN 1).By default, VLAN 1 is the Default VLAN. To change that designation, use the default vlan-id command in CONFIGURATION mode.You cannot delete the Default VLAN.NOTE: You cannot assign an IP address to the Default VLAN. To assign an IP address to a VLAN that is currently the DefaultVLAN, create another VLAN and assign it to be the Default VLAN. For more information about assigning IP addresses, refer toAssigning an IP Address to a VLAN.• Untagged interfaces must be part of a VLAN. To remove an untagged interface from the Default VLAN, create another VLAN and placethe interface into that VLAN. Alternatively, use the no switchport command, and Dell Networking OS removes the interface fromthe Default VLAN.• A tagged interface requires an additional step to remove it from Layer 2 mode. Because tagged interfaces can belong to multipleVLANs, remove the tagged interface from all VLANs using the no tagged interface command. Only after the interface isuntagged and a member of the Default VLAN can you use the no switchport command to remove the interface from Layer 2mode. For more information, refer to VLANs and Port Tagging.Example of Configuring an Interface for Layer 2 Belonging to the Default VLANDell(conf)#interface tengigabitethernet 1/1/2/1Dell(conf-if)#no shutDell(conf-if)#switchportDell(conf-if)#show config!interface TenGigabitEthernet 1/1/2/1no ip addressswitchportno shutdownDell(conf-if)#endDell#show vlanCodes: * - Default VLAN, G - GVRP VLANsNUM Status Q Ports* 1 Active U Te 1/1/2/1T Te 1/1/1/1Port-Based VLANsPort-based VLANs are a broadcast domain defined by different ports or interfaces. In Dell Networking OS, a port-based VLAN can containinterfaces from different line cards within the chassis. Dell Networking OS supports 4094 port-based VLANs.Port-based VLANs offer increased security for traffic, conserve bandwidth, and allow switch segmentation. Interfaces in different VLANsdo not communicate with each other, adding some security to the traffic on those interfaces. Different VLANs can communicate betweeneach other by means of IP routing. Because traffic is only broadcast or flooded to the interfaces within a VLAN, the VLAN conservesbandwidth. Finally, you can have multiple VLANs configured on one switch, thus segmenting the device.Interfaces within a port-based VLAN must be in Layer 2 mode and can be tagged or untagged in the VLAN ID.Virtual LANs (VLANs) 911
