Appendix C Introduction To Packet Precedences; Ip Precedence And Dscp Values - H3C WX5500H series User Configuration Manual

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Port priority
4
5
6
7

Appendix C Introduction to packet precedences

IP precedence and DSCP values

Figure 9 ToS and DS fields
Bits:
0
Preced
IPv4 ToS
ence
byte
RFC 1122
IP Type of Service (ToS)
As shown in
IP precedence from 0 to 7. According to RFC 2474, the ToS field is redefined as the differentiated
services (DS) field. A DSCP value is represented by the first 6 bits (0 to 5) of the DS field and is in the
range 0 to 63. The remaining 2 bits (6 and 7) are reserved.
Table 8 IP precedence
IP precedence (decimal)
0
1
2
3
4
5
6
7
Table 9 DSCP values
DSCP value (decimal)
46
10
12
1
2
3
4
5
6
7
M
Type of
B
Service
Z
Must
RFC 1349
Be
Zero
RFC 791
Figure
9, the ToS field in the IP header contains 8 bits. The first 3 bits (0 to 2) represent
Local precedence
4
5
6
7
Bits:
0
1
2
3
DSCP
DS-Field
(for IPv4,ToS
octet,and for
IPv6,Traffic
Class octet )
Class Selector
codepoints
Differentiated Services
Codepoint (DSCP)
RFC 2474
IP precedence (binary)
000
001
010
011
100
101
110
111
DSCP value (binary)
101110
001010
001100
38
4
5
6
7
CU
Currently
Unused
Description
Routine
priority
immediate
flash
flash-override
critical
internet
network
Description
ef
af11
af12

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