3Com S7906E Command Reference Manual page 1722

By default, no WRED table is created.
A WRED table in use cannot be removed.
Related commands: queue.
Examples
# Create a WRED table named queue-table1.
<Sysname> system-view
[Sysname] qos wred queue table queue-table1
[Sysname-wred-table-queue-table1]
queue
Syntax
queue queue-id [ drop-level drop-level ] low-limit low-limit [ discard-probability discard-prob ]
undo queue { queue-id | all }
View
WRED table view
Default Level
2: System Level
Parameters
queue-id: ID of the queue, in the range of 0 to 7.
drop-level drop-level: Specifies a drop level, in the range of 0 to 2. If this argument is not specified, the
subsequent configuration takes effect on the packets in the queue regardless of the drop level.
low-limit low-limit: Specifies a lower threshold. When the queue length exceeds the lower threshold,
WRED begins to drop packets. The low-limit argument ranges from 0 to 100 and defaults to 10.
discard-probability discard-prob: Specifies the discard-prob argument, which ranges from 0 to 90 and
defaults to 10. Each drop level is configured with an independent drop probability. The meaning of
discard-probability discard-prob depends on the type of the LPU where the WRED table-applied port
resides, as shown in
Table 4-2 Description on discard-probability discard-prob
LPU type
EA
Table 4-2.
Description on discard-probability discard-prob
In a coordinate graph with the queue length percentage as the abscissa and drop
probability as the ordinate, discard-prob specifies the degree of the included
angle between the abscissa and the straight line starting at (low-limit, 0) and
ending at (100%, max-drop-probability). The degree of the included angel
ranges from 0 to 90.
When the queue length is fixed, the bigger the argument, the bigger the
drop-probability.
When the argument is fixed, the bigger the queue length, the bigger the
drop-probability.
4-4