802.1P Priority - H3C WX5500H series User Configuration Manual

DSCP value (decimal)
14
18
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. It applies to occasions where Layer 3 header analysis is not
needed and QoS must be assured at Layer 2.
Figure 10 An Ethernet frame with an 802.1Q tag header
Destination
Address
6 bytes
As shown in
(TPID) and the 2-byte tag control information (TCI). The value of the TPID is 0x8100.
shows the format of the 802.1Q tag header. The Priority field in the 802.1Q tag header is called
802.1p priority, because its use is defined in IEEE 802.1p.
priority.
DSCP value (binary)
001110
010010
010100
010110
011010
011100
011110
100010
100100
100110
001000
010000
011000
100000
101000
110000
111000
000000
802.1Q
header
Source
Address
TPID TCI
6 bytes 4 bytes
Figure 10, the 4-byte 802.1Q tag header contains the 2-byte tag protocol identifier
Length
Data
/Type
2 bytes 46~1500 bytes
39
Description
af13
af21
af22
af23
af31
af32
af33
af41
af42
af43
cs1
cs2
cs3
cs4
cs5
cs6
cs7
be (default)
FCS(CRC-
32)
4 bytes
Table 10 shows the values for 802.1p
Figure 11