Command Reference Guide

3Com Router 3000 Ethernet Family
Command Reference Guide
Chapter 2 Congestion Management Configuration
Commands
3Com Corporation
2-54
Keyword DSCP value(binary) DSCP value(decimal)
cs7 111000 56
default 000000 0
low-limit: Lower threshold value, in the range of 1 to 1024. It is 10 by default.
high-limit: Upper threshold value, in the range of 1 to 1024. It is 30 by default.
discard-prob: Denominator of drop probability, in the range of 1 to 255. It is 10 by
default.
Description
Use the wred dscp command to set DSCP lower-limit, upper-limit and drop probability
denominator of WRED.
Use the undo wred dscp command to delete the configuration.
This command can be used only after the wred command has been used to enable
WRED drop mode based on DSCP.
The configuration of wred dscp will be deleted if the configuration of qos wred is
deleted.
The configuration of drop parameter will be deleted if the configuration of queue af is
deleted.
Related command: qos policy, traffic behavior, classifier behavior.
Example
# Set the queue lower-limit to 20, upper-limit to 40 and discard probability to 15 for the
packet whose DSCP is 3.
[3Com ] traffic behavior database
[3Com -behavior-database] wred dscp
[3Com -behavior-database] wred dscp 3 low-limit 20 high-limit 40
discard-probability 15
2.5.43 wred ip-precedence
Syntax
wred ip-precedence precedence low-limit low-limit high-limit high-limit
[ discard-probability discard-prob ]
undo wred ip-precedence precedence
View
Traffic behavior view