Switch User Manual

Chapter 4 Command-Line Reference 4-129
Example
The following example shows how to add VLANs 1, 2, 5 and 6 to the allowed list
as tagged VLANs for port SNP1:
4.3.12.9 switchport forbidden vlan
Use this command to configure forbidden VLANs. Use the no form to remove the
list of forbidden VLANs.
Syntax
switchport forbidden vlan {add vlan | remove vlan}
no switchport forbidden vlan
■ add vlan – VLAN ID to add.
■ remove vlan – VLAN ID to remove.
Do not enter leading zeroes. (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 through 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 SNP1
Console(config-if)#switchport allowed vlan add 1 tagged
Console(config-if)#switchport allowed vlan add 2 tagged
Console(config-if)#switchport allowed vlan add 5 tagged
Console(config-if)#switchport allowed vlan add 6 tagged
Console(config-if)#