Patton electronic 3202 Port-Based QinQ, TPID Tag Protocol Identifier Enter 33024 for IEEE802.1Q

Model 3202 Getting Started Guide 4 • Web configuration

Port-Based QinQ

Click on VLAN under Advanced on the main menu to reach the VLAN advanced configuration page. Then, select the radio button for Port-Based QinQ to display the configuration options.

Figure 20. Port-Based QinQ VLAN page

•PVID (Port VID): An untagged member of the default VLAN. Select from 1 to 4094.

•TPID (Tag Protocol Identifier): Enter 33024 for IEEE802.1Q .

•Link Type: Select from Access or Trunk. Access means the port can receive or send untagged packets. Trunk means that the port can receive or send tagged packets.

A VLAN tag uses the tag protocol identifier (TPID) field to identify the protocol type of the tag. The value of this field, as defined in IEEE 802.1Q, is 0x8100 (33024).

Figure 21. VLAN Tag structure of an Ethernet frame

On devices of different vendors, the TPID of the outer VLAN tag of QinQ frames may have different default values. You can set or modify this TPID value, so that the QinQ frames, when arriving at the public network, carries the TPID value of a specific vendor to allow interoperation with devices of that vendor.

The TPID in an Ethernet frame has the same position with the protocol type field in a frame without a VLAN tag. To avoid chaotic packet forwarding and receiving, you cannot set the TPID value to any of the values in table 9 on page 48.

Advanced Configuration Options 47