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Chapter 9
| Class of Service
Layer 3/4 Priority Settings
◆
Drop Precedence – Drop precedence used for Random Early Detection in
controlling traffic congestion. (Range: 0 - Green, 3 - Yellow, 1 - Red)
Table 15: Default Mapping of DSCP Values to Internal PHB/Drop Values
ingress-
0
dscp1
ingress-
dscp10
0
0,0
1
1,0
2
2,0
3
3,0
4
5,0
5
6,0
6
7,0
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.
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 132: Configuring DSCP to DSCP Internal Mapping
1
2
3
4
0,1
0,0
0,3
0,0
1,3
1,0
1,1
1,0
2,1
2,0
2,3
3,0
3,3
4,0
4,1
4,0
5,1
5,0
5,3
5,0
6,3
6,0
6,1
6,0
7,1
7,0
7,3
– 220 –
5
6
7
8
0,1
0,0
0,3
1,0
1,3
2,0
2,1
2,0
3,1
3,0
3,3
3.0
4,3
4,0
4,1
4.0
5,1
6,0
5,3
6,0
6,3
7,0
7,1
7.0
9
1,1
2,3
3,1
4,3
6,1
7,3
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