Traffic control
Basic - L3P
Release
3.1
06/07
8.4
Prioritization
141
The PHB class selector assigns the 7 possible IP precedence values
from the old TOS field to particular DSCP values, thus ensuring the
downwards compatibility.
ToS Meaning Precedence Value Assigned DSCP
Network Control 111 CS7 (111000)
Internetwork Control 110 CS6 (110000)
Critical 101 CS5 (101000)
Flash Override 100 CS4 (100000)
Flash 011 CS3 (011000)
Immediate 010 CS2 (010000)
Priority 001 CS1 (001000)
Routine 000 CS0 (000000)
Table 10: Assigning the IP precedence values to the DSCP value
DSCP Value DSCP Name Priority Class
(default setting)
0 Best Effort /CS0 2
1-7 2
8 CS1 0
9,11,13,15 0
10,12,14 AF11,AF12,AF13 0
16 CS2 1
17,19,21,23 1
18,20,22 AF21,AF22,AF23 1
24 CS3 3
25,27,29,31 3
26,28,30 AF31,AF32,AF33 3
32 CS4 4
33,35,37,39 4
34,36,38 AF41,AF42,AF43 4
40 CS5 5
41,42,43,44,45,47 5
46 EF 5
48 CS6 6
Table 11: Mapping the DSCP values onto the priority classes
To Next Page
Loading...
Need help?
General
