VLAN Commands 459
User Guidelines
• There are no user guidelines for this command.
Example
The following example configures g8 to discard untagged frames at ingress.
switchport forbidden vlan
The switchport forbidden vlan Interface Configuration mode command forbids adding specific VLANs
to a port. This may be used to prevent GVRP from automatically making these VLANs active on the
selected ports. To revert to allowing the addition of specific VLANs to the port, use the remove
parameter for this command.
Syntax
•
switchport forbidden vlan
{
add
vlan-list
|
remove
vlan-list
}
•
add
vlan-list
— List of VLAN IDs to add to the "forbidden" list. Separate non consecutive VLAN
IDs with a comma and no spaces. A hyphen designates a range of IDs.
•
remove
vlan-list
— List of VLAN IDs to remove from the "forbidden" list. Separate non
consecutive VLAN IDs with a comma and no spaces. A hyphen designates a range of IDs.
Default Configuration
All VLANs allowed.
Command Mode
Interface Configuration (Ethernet, port-channel) mode.
User Guidelines
• There are no user guidelines for this command.
Example
The following example forbids adding VLANs number 234 till 256, to g8.
Console (config)# interface ethernet g8
Console (config-if)# switchport general acceptable-frame-type
tagged-only
Console (config)# interface ethernet g8
Console (config-if)# switchport forbidden vlan add 234-256
5400_CLI.book Page 459 Wednesday, December 17, 2008 4:33 PM
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