Juniper JUNOSE 11.1.X - QUALITY OF SERVICE CONFIGURATION GUIDE 3-21-2010 Configuration Manual page 64

JUNOSe 11.1.x Quality of Service Configuration Guide
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Related Topics
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Configuring WRED
Create a drop profile and enter Drop Profile Configuration mode.
host1(config)#drop-profile internetDropProfile
host1(config-drop-profile)#
You can configure up to 16 drop profiles.
Set the average-length exponent, which specifies the exponent used to weight
the average queue length over time, controlling WRED responsiveness.
host1(config-drop-profile)#average-length-exponent 9
Specifying an average-length exponent enables the RED average queue length
computation.
A higher value smooths out the average and slows WRED reaction to
congestion and decongestion, accommodating short bursts without dropping.
Too large a value can smooth the average to the point that WRED does not
react at all.
A lower value speeds up WRED reaction. Too low a value can cause
overreaction to short bursts, dropping packets unnecessarily.
(Optional) Set the minimum and maximum threshold for committed traffic.
host1(config-drop-profile)#committed-threshold percent 30 90 4
(Optional) Set the minimum and maximum threshold for conformed traffic.
host1(config-drop-profile)#conformed-threshold percent 25 90 5
(Optional) Set the minimum and maximum threshold for exceeded traffic.
host1(config-drop-profile)#exceeded-threshold percent 20 90 6
The thresholds specify a linear relationship between average queue length and
drop probability.
You can express thresholds as either percentages of maximum queue size by
including the keyword percent, or as absolute byte values by omitting the
keyword.
Configuring RED on page 27
Monitoring RED and WRED on page 36
average-length-exponent
committed-threshold
conformed-threshold
drop-profile
exceeded-threshold