H3C S5600 SERIES Operation Manual page 707

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DSCP value (decimal)

2) 802.1p priority

802.1p priority lies in Layer 2 packet headers and is applicable to occasions where the

Layer 3 packet header does not need analysis but QoS must be assured at Layer 2.

Figure 1-3 An Ethernet frame with an 802.1Q tag header

As shown in the figure above, the 4-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).

802.1Q tag header.

Figure 1-4 802.1Q tag headers

In the figure above, the priority field (three bits in length) in TCI is 802.1p priority (also

known as CoS precedence), which ranges from 0 to 7.

Table 1-4 Description on 802.1p priority

802.1p priority (decimal)

DSCP value (binary)

802.1p priority (binary)

be (default)

describes the detailed contents of an

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