Installing the Software 23
Create a Port-based VLAN
The Default VLAN as VLAN 1 is part of the system startup configuration and
does not require configuration. To configure a port-based VLAN, you must
create the VLAN and then add physical interfaces or port channel (LAG)
interfaces to the VLAN.
NOTE: After you create a VLAN, you must assign interfaces in Layer 2 mode to
the VLAN to activate the VLAN.
Use the show vlan command in the EXEC privilege mode to view the
configured VLANs.
Assign Interfaces to a VLAN
To view just the interfaces that are in Layer 2 mode, enter the show interfaces
switchport command in the EXEC privilege mode or EXEC mode.
To tag frames leaving an interface in Layer 2 mode, you must assign that
interface to a port-based VLAN to tag it with that VLAN ID. To tag interfaces,
use these commands in the following sequence:
Task Command Syntax Command Mode
Configure a port-based VLAN (if the
vlan-id is different from the Default
VLAN ID) and enter INTERFACE
VLAN mode.
interface vlan vlan-id CONFIGURATION
Step Task Command Syntax Command Mode
1 Access the
INTERFACE VLAN
mode of the VLAN to
which you want to
assign the interface.
interface vlan vlan-id CONFIGURATION
2 Enable an interface to
include the IEEE
802.1Q tag header.
tagged interface INTERFACE
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