Appendix C Introduction To Packet Precedences; Ip Precedence And Dscp Values - HP FlexNetwork MSR Series Configuration Manuals

Input priority value
4
5
6
7
Table 9 Default port priority-local priority map
Port priority
0
1
2
3
4
5
6
7

Appendix C Introduction to packet precedences

IP precedence and DSCP values

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.
Figure 30 ToS and DS fields
Bits: 0
Preced
IPv4 ToS
ence
byte
RFC 1122
IP Type of Service (ToS)
Table 10 IP precedence
IP precedence (decimal)
0
1
2
lp-dot1p map
4
5
6
7
Figure 30, the ToS field in the IP header contains 8 bits. The first 3 bits (0 to 2) represent
1 2 3 4 5 6 7
M
Type of
B
Service
Z
(for IPv4,ToS
Must
RFC 1349
Be
Zero
RFC 791
IP precedence (binary)
000
001
010
lp-dscp map
32
40
48
56
Local precedence
0
1
2
3
4
5
6
7
Bits: 0 1 2 3
DS-Field DSCP
octet,and for
IPv6,Traffic
Class octet )
Class Selector
codepoints
Differentiated Services
Codepoint (DSCP)
RFC 2474
115
4 5 6 7
CU
Currently
Unused
Description
Routine
priority
immediate