H3C Technologies H3C WX3000E Series Wireless Switches - Manual (Page 63)

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As shown in Figure 18 , the four-byte 802.1Q tag header consists of the tag protocol identifier (TPID, two
bytes in length), whose value is 0x8100, and the tag control information (TCI, two bytes in length). Figure
19 presents the format of the 802.1Q tag header. The Priority field in the 802.1Q tag header is called the
“802.1p priority”, because its use is defined in IEEE 802.1p. Table 8 presents the values for 802.1p
priority.
Figure 19 802.1Q tag header
Table 8 Description on 802.1p priority
802.1p priority (decimal) 802.1p priority (binary) Description
0 000 best-effort
1 001 background
2 010 spare
3 011 excellent-effort
4 100 controlled-load
5 101 video
6 110 voice
7 111 network-management