VLAN Commands 4

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: 1-4094).

Default Setting

No VLANs are included in the forbidden list.

Command Mode

Interface Configuration (Ethernet Ports 1-8, 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:

Console(config)#interface ethernet 1/1

Console(config-if)#switchport forbidden vlan add 3

Console(config-if)#

Displaying VLAN Information

Table 4-58 Displaying VLAN Information

Command

Function

Mode

Page

 

 

 

 

show vlan

Shows VLAN information

NE, PE

4-176

 

 

 

 

show interfaces status vlan

Displays status for the specified VLAN interface

NE, PE

4-130

 

 

 

 

show interfaces switchport

Displays the administrative and operational status of an

NE, PE

4-132

 

interface

 

 

4-175