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Command Usage
• When creating a protocol-based VLAN, only assign interfaces via this
command. If you assign interfaces using any of the other VLAN
commands (such as vlan on page3-55), these interfaces will admit
traffic of any protocol type into the associated VLAN.
When a frame enters a port that has been assigned to a protocol VLAN ,
it is processed in the following manner:
- If the frame is tagged, it will be processed according to the standard
rules applied to tagged frames.
- If the frame is untagged and the protocol type matches, the frame is
forwarded to the appropriate VLAN.
- If the frame is untagged but the protocol ty pe does not match, the
frame is forwarded to the default VLAN for this interface.
Example
The following example maps the traffic entering Port 1 which matches the
protocol type specified in protocol group 1 to VLAN 2.

show protocol-vlan protocol-group

This command shows the frame and protocol type asso ciated with
protocol groups.
Syntax
show protocol-vlan protocol-group [group-id]
group-id - Group identifier for a protocol group. (Range:
1-2147483647)
Default Setting
All protocol groups are displayed.
Console(config)#interface ethernet 1/1
Console(config-if)#protocol-vlan protocol-group 1 vlan 2
Console(config-if)#