Command Reference Guide

3Com Router 3000 Ethernet Family
Command Reference Guide
Chapter 2 Congestion Management Configuration
Commands
3Com Corporation
2-55
Parameter
precedence: Precedence of IP packet, in the range of 0 to 7.
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 ip-precedence command to set precedence lower-limit, upper-limit and
drop probability denominator of WRED.
This command can be used only after the wred command has been used to enable
WRED drop mode based on IP precedence.
The configuration of wred ip-precedence will be deleted when wred configuration is
deleted.
The configuration of drop parameters will be deleted if queue af is deleted.
Related command: qos policy, traffic behavior, classifier behavior.
Example
# Set lower-limit to 20, upper-limit to 40 and discard probability to 40 for the packet with
the precedence 3.
[3Com ] traffic behavior database
[3Com -behavior-database] wred
[3Com -behavior-database] wred ip-precedence 3 low-limit 20 high-limit 40
discard-probability 15
2.5.44 wred weighting-constant
Syntax
wred weighting-constant exponent
undo wred weighting-constant
View
Traffic behavior view
Parameter
exponent: Exponential, in the range of 1 to 16. It is 6 by default.