Web Management Guide-R05

Table Of Contents
Chapter 9
| Class of Service
Layer 3/4 Priority Settings
– 239
Drop Precedence
– Drop precedence used for Random Early Detection in
controlling traffic congestion. (Range: 0 - Green, 3 - Yellow, 1 - Red)
Web Interface
To map DSCP values to internal PHB/drop precedence:
1.
Click Traffic, Priority, DSCP to DSCP.
2.
Select Configure from the Action list.
3.
Select a port.
4.
Set the PHB and drop precedence for any DSCP value.
5.
Click Apply.
Figure 139: Configuring DSCP to DSCP Internal Mapping
Table 16: Default Mapping of DSCP Values to Internal PHB/Drop Values
ingress-
dscp1
ingress-
dscp10
0123456789
0 0,0 0,1 0,0 0,3 0,0 0,1 0,0 0,3 1,0 1,1
1 1,0 1,3 1,0 1,1 1,0 1,3 2,0 2,1 2,0 2,3
2 2,0 2,1 2,0 2,3 3,0 3,1 3,0 3,3 3.0 3,1
3 3,0 3,3 4,0 4,1 4,0 4,3 4,0 4,1 4.0 4,3
4 5,0 5,1 5,0 5,3 5,0 5,1 6,0 5,3 6,0 6,1
5 6,0 6,3 6,0 6,1 6,0 6,3 7,0 7,1 7.0 7,3
6 7,0 7,1 7,0 7,3
The ingress DSCP is composed of ingress-dscp10 (most significant digit in the left column) and
ingress-dscp1 (least significant digit in the top row (in other words, ingress-dscp = ingress-
dscp10 * 10 + ingress-dscp1); and the corresponding internal-dscp is shown at the intersecting
cell in the table.
The ingress DSCP is bitwise ANDed with the binary value 11 to determine the drop precedence.
If the resulting value is 10 binary, then the drop precedence is set to 0.