3Com S7902E Command Reference Manual - page 1722
4-4
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] 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
.
Table 4-2
Description on
discard-probability
discard-prob
LPU type
Description on discard-probability discard-prob
EA
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.
z
When the queue length is fixed, the bigger the argument, the bigger the
drop-probability.
z
When the argument is fixed, the bigger the queue length, the bigger the
drop-probability.