802.1P Priority - HP MSR4080 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 26 An Ethernet frame with an 802.1Q tag header
As shown in
and the 2-byte tag control information (TCI). The value of the TPID is 0x8100.
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.
Figure 26, the 4-byte 802.1Q tag header consists of the 2-byte tag protocol identifier (TPID)
DSCP value (binary)
001110
010010
010100
010110
011010
011100
011110
100010
100100
1001 10
001000
0100 00
0110 00
1000 00
1010 00
1100 00
1110 00
000000
Table 10 shows the values for 802.1p priority.
95
Description
af13
af21
af22
af23
af31
af32
af33
af41
af42
af43
cs1
cs2
cs3
cs4
cs5
cs6
cs7
be (default)
Figure 27 shows the format