Priority Mapping Configuration; Introduction To Packet Precedences; Ip Precedence And Dscp Values - H3C WA2200 Series Configuration Manual

7

Priority Mapping Configuration

This chapter includes these sections:

Introduction to Packet Precedences

Priority Mapping Overview
Priority Mapping Configuration Task List
Configuring Priority Mapping
Displaying and Maintaining Priority Mapping
Priority Mapping Configuration Example
Introduction to Packet Precedences

IP Precedence and DSCP Values

Figure 7-1 ToS and DS fields
As shown in Figure
represent IP precedence from 0 to 7. According to RFC 2474, the ToS field of the IP 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 7-1 Description on IP precedence
IP precedence (decimal)
0
1
2
3
4
5
6
7
7-1, the ToS field of the IP header contains eight bits, and the first three bits (0 to 2)
IP precedence (binary)
000
001
010
011
100
101
110
111
7-1
Description
Routine
priority
immediate
flash
flash-override
critical
internet
network