802.1P Priority - H3C S5120-SI Configuration Manual

DSCP value (decimal)
20
22
26
28
30
34
36
38
8
16
24
32
40
48
56
0

802.1p priority

802.1p priority lies in the Layer 2 header and applies to occasions where Layer 3 header analysis is not
needed and QoS must be assured at Layer 2.
Figure 18 An Ethernet frame with an 802.1Q tag header
As shown in
bytes in length), whose value is 0x8100, and the tag control information (TCI, two bytes in length).
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.
priority.
Figure 18, the four-byte 802.1Q tag header consists of the tag protocol identifier (TPID, two
DSCP value (binary)
010100
0101 10
01 1010
01 1 100
01 1 1 10
100010
100100
1001 10
001000
010000
01 1000
100000
101000
1 10000
1 1 1000
000000
54
Description
af22
af23
af31
af32
af33
af41
af42
af43
cs1
cs2
cs3
cs4
cs5
cs6
cs7
be (default)
Table 10 presents the values for 802.1p
Figure