HP 6125G HP 6125G & 6125G/XG Blade Switches ACL and QoS Configuration - Page 78

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DSCP value (decimal) 20 22 26 28 30 34 36 38 8 16 24 32 40 48 56 0 DSCP value (binary) 010100 010110 011010 011100 011110 100010 100100 100110 001000 010000 011000 100000 101000 110000 111000 000000 Description af22 af23 af31 af32 af33 af41 af42 af43 cs1 cs2 cs3 cs4 cs5 cs6 cs7 be (default) 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 25 An Ethernet frame with an 802.1Q tag header As shown in Figure 25, the four-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). Figure 26 shows 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. Table 9 shows the values for 802.1p priority. 72

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72
DSCP value (decimal)
DSCP value (binary)
Description
20
010100
af22
22
010110
af23
26
011010
af31
28
011100
af32
30
011110
af33
34
100010
af41
36
100100
af42
38
100110
af43
8
001000
cs1
16
010000
cs2
24
011000
cs3
32
100000
cs4
40
101000
cs5
48
110000
cs6
56
111000
cs7
0
000000
be (default)
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 25
An Ethernet frame with an 802.1Q tag header
As shown in
Figure 25
, the four-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).
Figure
26
shows 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.
Table 9
shows the values for 802.1p priority.