CLI Reference Guide-R04

Chapter 22 | VLAN Commands
GVRP and Bridge Extension 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. (Range: 1-4094).
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.
◆ GVRP cannot be enabled for ports set to Access mode (see the switchport
mode command).
◆ This command will not be accepted if the specified VLAN does not exist on the
switch.
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)#
switchport gvrp This command enables GVRP for a port. Use the no form to disable it.
Syntax
[no] switchport gvrp
Default Setting
Disabled