Understanding the native Vlan and 802 1Q tagged frame
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802.1Q is a standard protocol used by switches to multiplex vlan traffic
What's in the 802.1Q tag?
TPID Tag protocol identifier
TCI Tag control information
Priority code point (PCP) used for quality of service
Drop eligible indicator (DEI) used in conjunction with PCP
VLAN identifier (VID) specify the vlan number