Type/TPID: When the value is 0x8100, it indicates an 802.1Q Tag frame; this field is also called "TPID (Tag Protocol Identifier, tag protocol identifier)"
PRI: Indicates the priority of the frame, the value range is 0~7, the larger the value, the higher the priority
CFI: Canonical Format Indicator, indicating whether the MAC address is in the classic format, CFI is 0 The description is a standard format. A CFI of 1 indicates a non-standard format. The CFI value of Ethernet is 0
VID: The configurable VLAN ID range is 1 to 4094. 0 and 4095 are reserved in the protocol. VLAN ID
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