Netgear GSM7224v2 - 24-Port Layer 2 Managed Gigabit Switch ユーザーズマニュアル

You can use a protocol based VLAN to define filtering criteria for untagged packets. By 
default, if you do not configure any port- (IEEE 802.1Q) or protocol based VLANs, untagged 
packets will be assigned to VLAN 1. You can override this behavior by defining either 
port-based VLANs or protocol based VLANs, or both. Tagged packets are always handled 
according to the IEEE 802.1Q standard, and are not included in protocol based VLANs.

If you assign a port to a protocol based VLAN for a specific protocol, untagged frames 
received on that port for that protocol will be assigned the protocol based VLAN ID. Untagged 
frames received on the port for other protocols will be assigned the Port VLAN ID - either the 
default PVID (1) or a PVID you have specifically assigned to the port using the Port VLAN 
Configuration screen.

You define a protocol based VLAN by creating a group. Each group has a one-to-one 
relationship with a VLAN ID, can include one to three protocol definitions, and can include 
multiple ports. When you create a group you will choose a name and a Group ID will be 
assigned automatically.

To display the Protocol Based VLAN Group Configuration page, click Switching

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 Protocol Based VLAN Group Configuration.