802.1P Priority - HP A6600 Configuration Manual

Table 7 Description on DSCP values
DSCP value (decimal)
46
10
12
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 and applies to occasions where Layer 3 header analysis is not
needed and QoS must be assured at Layer 2.
Figure 48 Ethernet frame with an 802.1Q tag header
Destination
Address
6 bytes
As shown in Figure
is 0x8100, and the TCI, two bytes in length).
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
DSCP value (binary)
101110
001010
001100
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
48, the 4-byte 802.1Q tag header consists of the TPID, two bytes in length), whose value
presents the values for 802.1p priority.
Length/Type Data
46 to 1500 bytes
2 bytes
Figure 49 presents the format of the 802.1Q tag header. The
139
Description
ef
af11
af12
af13
af21
af22
af23
af31
af32
af33
af41
af42
af43
cs1
cs2
cs3
cs4
cs5
cs6
cs7
be (default)
FCS
(CRC - 32)
4 bytes