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| Class of Service
C
11
HAPTER
Layer 3/4 Priority Settings
Random Early Detection starts dropping yellow and red packets when
◆
the buffer fills up to 0x60 packets, and then starts dropping any
packets regardless of color when the buffer fills up to 0x80 packets.
P
ARAMETERS
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 Detection
◆
in controlling traffic congestion. (Range: 0 - Green, 3 - Yellow, 1 - Red)
Table 17: Default Mapping of DSCP Values to Internal PHB/Drop Values
ingress-
0
1
dscp1
ingress-
dscp10
0
0,0
0,1
1
1,0
1,3
2
2,0
2,1
3
3,0
3,3
4
5,0
5,1
5
6,0
6,3
6
7,0
7,1
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.
W
I
EB
NTERFACE
To map DSCP values to internal PHB/drop precedence:
Click Traffic, Priority, DSCP to DSCP.
1.
Select Configure from the Action list.
2.
Select a port.
3.
Set the PHB and drop precedence for any DSCP value.
4.
Click Apply.
5.
– 252 –
2
3
4
5
0,0
0,3
0,0
0,1
1,0
1,1
1,0
1,3
2,0
2,3
3,0
3,1
4,0
4,1
4,0
4,3
5,0
5,3
5,0
5,1
6,0
6,1
6,0
6,3
7,0
7,3
6
7
8
9
0,0
0,3
1,0
1,1
2,0
2,1
2,0
2,3
3,0
3,3
3.0
3,1
4,0
4,1
4.0
4,3
6,0
5,3
6,0
6,1
7,0
7,1
7.0
7,3
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Troubleshooting
