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VLAN Commands
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switchport forbidden vlan
This command configures forbidden VLANs. Use the no form to remove the list of
forbidden VLANs.
Syntax
switchport forbidden vlan {add vlan-list | remove vlan-list}
no switchport forbidden vlan
• add vlan-list - List of VLAN identifiers to add.
• remove vlan-list - List of VLAN identifiers to remove.
• vlan-list - Separate nonconsecutive VLAN identifiers with a comma and no
spaces; use a hyphen to designate a range of IDs. Do not enter leading
zeros. (Range: 1-4093).
Default Setting
No VLANs are included in the forbidden list.
Command Mode
Interface Configuration (Ethernet, Port Channel)
Command Usage
• This command prevents a VLAN from being automatically added to the
specified interface via GVRP.
• If a VLAN has been added to the set of allowed VLANs for an interface, then
you cannot add it to the set of forbidden VLANs for that same interface.
Example
The following example shows how to prevent port 1 from being added to VLAN 3:
Displaying VLAN Information
Console(config)#interface ethernet 1/1
Console(config-if)#switchport forbidden vlan add 3
Console(config-if)#
Table 4-62 Commands for Displaying VLAN Information
Command Function Mode Page
show vlan Shows VLAN information NE, PE 4-196
show interfaces status vlan Displays status for the specified VLAN interface NE, PE 4-150
show interfaces switchport Displays the administrative and operational status of an
interface
NE, PE 4-152