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414
VLAN Commands
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DELL CONFIDENTIAL – PRELIMINARY 9/13/06 – FOR PROOF ONLY
User Guidelines
There are no user guidelines for this command.
Example
The following example configures Ethernet port 1/e16 to discard untagged frames at ingress.
switch
p
o
r
t fo
r
bidden vlan
The
switchport forbidden vlan
Interface Configuration mode command forbids adding specific
VLANs to a port. To return to the default configuration, use the
remove
parameter for this
command.
Syntax
switchport forbidden vlan
{
add
vlan-list
|
remove
vlan-list
}
•
add
vlan-list
— Specifies the list of VLAN IDs to be added. Separate non-consecutive
VLAN IDs with a comma and no spaces. A hyphen designates a range of IDs.
•
remove
vlan-list
— Specifies the list of VLAN IDs to be removed. Separate non-
consecutive VLAN IDs with a comma and no spaces. A hyphen designates a range of IDs.
Default Configuration
All VLANs are allowed.
Command Mode
Interface Configuration (Ethernet, port-channel) mode
User Guidelines
•
This command can be used to prevent GVRP from automatically making the specified
VLANs active on the selected ports.
Example
The following example forbids adding VLAN IDs 234 to 256 to Ethernet port 1/e16.
Console(config)#
interface ethernet
1/e16
Console(config-if)#
switchport general acceptable-frame-type
tagged-only
Console(config)#
interface ethernet
1/e16
Console(config-if)#
switchport forbidden vlan add
234-256