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Default VLAN
When you configure interfaces for Layer 2 mode, they are automatically placed in the Default VLAN as
untagged interfaces. Only untagged interfaces 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 the switchport command. As shown in bold, the switchport command
places the interface in Layer 2 mode and the show vlan command 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 Default VLAN, create another VLAN and assign it to be the Default VLAN. For more
information about assigning IP addresses, refer to
•
Untagged interfaces must be part of a VLAN. To remove an untagged interface from the Default VLAN,
create another VLAN and place the interface into that VLAN. Alternatively, use the no switchport
command, and the system removes the interface from the Default VLAN.
•
A tagged interface requires an additional step to remove it from Layer 2 mode. Because tagged
interfaces can belong to multiple VLANs, remove the tagged interface from all VLANs using the no
tagged interface command. Only after the interface is untagged and a member of the Default VLAN
can you use the no switchport command to remove the interface from Layer 2 mode. For more
information, refer to
Example of Configuring an Interface for Layer 2 Belonging to the Default VLAN
Dell(conf)#int te 2/2
Dell(conf-if)#no shut
Dell(conf-if)#switchport
Dell(conf-if)#show config
!
interface TenGigabitEthernet 2/2
no ip address
switchport
no shutdown
Dell(conf-if)#end
Dell#show vlan
Codes: * - Default VLAN, G - GVRP VLANs
NUM
Status
Q Ports
* 1
Active
U Te 2/2
2
Active
T Po1(Te 0/0-1)
T Te 2/0
Dell#
Port-Based VLANs
Port-based VLANs are a broadcast domain defined by different ports or interfaces. A port-based VLAN can
contain interfaces from different line cards within the chassis. The system supports 4094 port-based VLANs.
Port-based VLANs offer increased security for traffic, conserve bandwidth, and allow switch segmentation.
Interfaces in different VLANs do not communicate with each other, adding some security to the traffic on
VLANs and Port
Tagging.
Assigning an IP Address to a
VLAN.
Virtual LANs (VLANs)
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Troubleshooting
