Appendix C Introduction To Packet Precedences; Ip Precedence And Dscp Values - HP MSR4080 Configuration Manual

Input priority value
48 to 55
56 to 63

Appendix C Introduction to packet precedences

IP precedence and DSCP values

Figure 25 ToS and DS fields
Bits: 0
Preced
IPv4 T oS
ence
b yte
RFC 1122
IP Type of Service (ToS)
As shown in
pr eced ence from 0 to 7. According t
( DS) field, where a DSCP value is re
re maining 2 bits (6 and 7) are reserved.
Table 8 IP preceden
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 25, the ToS field
ce
dscp-lp map
6
7
Bi ts: 0 1 2 3
DS-Field DSCP
(for IPv4,ToS
octet,and fo r
IPv6,Traffic
Class octet )
Class Selector
codepoints
Differentiated Services
Codepoint (DSCP)
RFC 2474
in the IP header contains 8 bits.
o RFC 2 474, the ToS field is redef
presented b y the first 6 bits (0 to 5
IP precedence (binary)
000
001
010
011
100
101
110
111
DSCP value (binary)
101110
001010
001100
94
4 5 6 7
CU
Curren tly
Unuse d
The fi rst 3 bits (0 to 2) represent IP
ined a s the differentiated services
) and is in t he range 0 to 63. The
Description
Routine
priority
immediate
flash
flash-override
critical
internet
network
Description
ef
af11
af12