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VLAN C
OMMANDS
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• If a VLAN on the forbidden list for an interface is manually added to that
interface, the VLAN is automatically removed from the forbidden list for
that interface.
Example
The following example shows how to add VLANs 1, 2, 5 and 6 to the
allowed list as tagged VLANs for port 1:
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.
Console(config)#interface ethernet 1/1
Console(config-if)#switchport allowed vlan add 1,2,5,6 tagged
Console(config-if)#