Command Reference Guide

3Com Router 3000 Ethernet Family
Command Reference Guide Chapter 3 WRED Configuration Commands
3Com Corporation
3-3
high-limit: Upper limit. It ranges from 1 to 1024 and defaults to 30.
discard-prob: Drop probability denominator. It ranges from 1 to 255, and defaults to 10.
Description
Use the qos wred dscp command to set the lower limit, upper limit, and drop
probability denominator of a WRED DSCP.
Use the undo qos wred dscp command to restore the default settings.
Before configuring the WRED parameters, you must use the qos wred command to
apply the WRED to an interface. The thresholds limit the average queue length.
Related command: qos wred, display qos wred interface.
Example
# For DSCP 3, set the lower and upper average length limits of the queue to 20 and 40
respectively, and the drop probability denominator to 15.
[3Com -Ethernet0/0/0] qos wred dscp 3 low-limit 20 high-limit 40
discard-probability 15
3.1.4 qos wred ip-precedence
Syntax
qos wred ip-precedence ip-precedence low-limit low-limit high-limit high-limit
discard-probability discard-prob
undo qos wred ip-precedence ip-precedence
View
Interface view
Parameter
ip-precedence: Precedence of IP packets, in the range of 0 to 7;
low-limit low-limit: The minimum threshold, in the range of 1 to 1024; by default, it is
10.
high-limit high-limit: The maximum threshold, in the range of 1 to 1024; by default, it is
30.
discard-probability discard-prob: Drop probability denominator, ranging 1 to 255; by
default, it is 10.
Description
Use the qos wred ip-precedence command to configure the minimum threshold,
maximum threshold and drop probability denominator for each precedence level in
WRED.