The tag has bytes. The first bytes are the TPID (Tag Protocol Identifier), set to 0x8100 for Ethernet. The next bytes form the TCI (Tag Control Information). The TCI contains a -bit PCP field for priority, a -bit DEI field for drop eligibility, and a -bit VID field for the VLAN ID. The VID field is why VLAN IDs max out at .
##### ###### ##### ### # # ### # # ###### ## ## ## ## ## ## ## # # # # # ## ##### #### ##### # # # # # # # #### ## # ## ## ## ## # # # # # ## ## # ###### ## ### # ### # ######
$ curl repovive.com/roadmaps/network-design/switching-and-vlans/802-1q-tag-structure
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