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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 40 An Ethernet frame with an 802.1Q tag header
As shown in
value is 0x8100, and the TCI (2 bytes in length).
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 41 802.1Q tag header
Figure
40, the 4-byte 802.1Q tag header consists of the TPID (2 bytes in length), whose
Table 10
shows the values for 802.1p priority.
DSCP value (binary)
010100
010110
011010
011100
011110
100010
100100
100110
001000
010000
011000
100000
101000
110000
111000
000000
Figure 41
117
Description
af22
af23
af31
af32
af33
af41
af42
af43
cs1
cs2
cs3
cs4
cs5
cs6
cs7
be (default)
shows the format of the 802.1Q tag
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