VLAN Commands 597
Syntax
switchport forbidden vlan {add
vlan-list
| remove
vlan-list
}
•
add
vlan-list
— List of valid VLAN IDs to add to the forbidden list.
Separate nonconsecutive VLAN IDs with a comma and no spaces. Use a
hyphen to designate a range of IDs.
•
remove
vlan-list
— List of valid VLAN IDs to remove from the forbidden
list. Separate nonconsecutive VLAN IDs with a comma and no spaces. Use
a hyphen to designate a range of IDs.
Default Configuration
All VLANs allowed.
Command Mode
Interface Configuration (Ethernet, port-channel) mode
User Guidelines
This command has no user guidelines.
Example
The following example forbids adding VLAN numbers 234 through 256 to
port 1/g8.
console(config)#interface ethernet 1/g8
console(config-if-1/g8)#switchport forbidden vlan add
234-256
switchport general acceptable-frame-type
tagged-only
Use the switchport general acceptable-frame-type tagged-only command in
Interface Configuration mode to discard untagged frames at ingress. To
enable untagged frames at ingress, use the no form of this command.
Syntax
switchport general acceptable-frame-type tagged-only