C
HAPTER
10
| Class of Service
Layer 3/4 Priority Settings
– 278 –
PARAMETERS
These parameters are displayed:
◆ Port – Specifies a port.
◆ DSCP – DSCP value in ingress packets. (Range: 0-63)
◆ PHB – Per-hop behavior, or the priority used for this router hop.
(Range: 0-7)
◆ Drop Precedence – Drop precedence used for Random Early Discard
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.
Table 17: 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.
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