HP V1910 Switch Series User Manual page 431

Class selector (CS) class: This class is derived from the IP ToS field and includes eight subclasses;

Best effort (BE) class: This class is a special CS class that does not provide any assurance. AF traffic

exceeding the limit is degraded to the BE class. All IP network traffic belongs to this class by default.
Table 154 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 precedence
2.
802.1p precedence lies in Layer 2 packet headers and is applicable to occasions where Layer 3 header
analysis is not needed and QoS must be assured at Layer 2.
Figure 390 An Ethernet frame with an 802.1Q tag header
As shown in Figure 390, the 4-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).
391 presents the format of the 802.1Q tag header.
DSCP value (binary)
101110
001010
001100
001110
010010
010100
010110
011010
011100
011110
100010
100100
100110
001000
010000
011000
100000
101000
110000
111000
000000
417
Description
ef
af11
af12
af13
af21
af22
af23
af31
af32
af33
af41
af42
af43
cs1
cs2
cs3
cs4
cs5
cs6
cs7
be (default)
Figure