240
DSCP value (decimal) DSCP value (binary) Keyword
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 packet header and is applicable to occasions where Layer 3 header
analysis is not needed and QoS must be assured at Layer 2.
Figure 251 An Ethernet frame with an 802.1q tag header
As shown in Figure 251, the 4-byte 802.1q tag header consists of the TPID (2 bytes in length), whose
value is 0x8100, and the TCI (2 bytes in length). Figure 252 show
s the format of the 802.1q tag
header. The priority in the 802.1q tag header is called "802.1p priority," because its use is defined in
IEEE 802.1p.
Figure 252 802.1q tag header
Table 121 describes available 802.1p priority values.
Table 121 Description on 802.1p priority
802.1p priority (decimal) 802.1p priority (binary) Keyword
0 000 best-effort
1 001 background
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