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Appendix B Packet precedences
IP precedence and DSCP values
Figure 21 ToS and DS fields
As shown in
(0 to 2) represent IP precedence from 0 to 7; the Traffic Classes field in the IPv6 header contains
eight bits, where the first three bits (0 to 2) represent IP precedence from 0 to 7. According to RFC
2474, the ToS field in the IPv4 header or the Traffic Classes field in the IPv6 header is redefined as
the differentiated services (DS) field, where a DSCP value is represented by the first six bits (0 to 5)
and is in the range 0 to 63. The remaining two bits (6 and 7) are reserved.
Table 10 Description on IP precedence
IP precedence (decimal)
0
1
2
3
4
5
6
7
Table 11 Description on DSCP values
DSCP value (decimal)
46
10
12
14
18
20
22
Figure
21, the ToS field in the IPv4 header contains eight bits, where the first three bits
IP precedence (binary)
000
001
010
011
100
101
110
111
DSCP value (binary)
101110
001010
001100
001110
010010
010100
010110
60
Description
Routine
priority
immediate
flash
flash-override
critical
internet
network
Description
ef
af11
af12
af13
af21
af22
af23
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