Setting Wred To Calculate The Coefficient Of Average Queue Length; Setting Wred Priorities - 3Com 3C13636 Configuration Manual

3Com Router 3000 Ethernet Family
Configuration Guide
Note:
Make sure WFQ has already been applied on the interface before enabling WRED.

4.2.2 Setting WRED to Calculate the Coefficient of Average Queue Length

Set WRED to calculate the filter coefficient of the average queue length.
Perform the following configuration in interface view
Table 4-2 Set WRED exponent for mean queue depth calculation
Set WRED exponent for mean
queue depth calculation
Recover the default value of
exponent
The exponent is the filter coefficient to calculate the average queue length, ranging
from 1 to 16, with the default set as 9.
You must use qos wred command first on the interface before applying WRED, and
then set the parameter of WRED.

4.2.3 Setting WRED Priorities

When WFQ (Weighted Fair Queuing) is configured on an inerface, you can set
minimum/maximum threshold and drop probability denominator of the each
precedence of WRED.
Perform the following configuration in interface view.
Table 4-3 Set WRED parameters for each precedence
Operation
Set WRED parameters
for each precedence
To restore the default
value of precedence
You must use qos wred command first on the interface before applying WRED, and
then set the WRED parameter.
Operation
qos wred ip-precedence ip-precedence low-limit
low-limit
discard-prob
undo qos wred ip-precedence ip-precedence
3Com Corporation
Chapter 4 Congestion Avoidance
Command
qos wred weighting-constant exponent
undo qos wred weighting-constant
Command
high-limit high-limit
4-4
discard-probability