User Guide for FibeAir® IP-20 All-Outdoor Products, CeraOS 10.5
Page 318 of 825
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7.5
Configuring WRED
This section includes:
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Assigning WRED Profiles to Queues
7.5.1
WRED Overview
Weighted Random Early Detection (WRED) enables differentiation between
higher and lower priority traffic based on CoS. You can define up to 30 WRED
profiles. Each profile contains a green traffic curve and a yellow traffic curve. This
curve describes the probability of randomly dropping frames as a function of
queue occupancy.
The system also includes two pre-defined read-only profiles. These profiles are
assigned profile IDs 31 and 32:
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Profile number 31 defines a tail-drop curve and is configured with the
following values:
100% Yellow traffic drop after 64kbytes occupancy.
100% Green traffic drop after 128kbytes occupancy.
Yellow maximum drop is 100%
Green maximum drop is 100%
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Profile number 32 defines a profile in which all will be dropped. It is for
internal use and should not be applied to traffic.
A WRED profile can be assigned to each queue. The WRED profile assigned to the
queue determines whether or not to drop incoming packets according to the
occupancy of the queue. As the queue occupancy grows, the probability of
dropping each incoming frame increases as well. As a consequence, statistically
more TCP flows will be restrained before traffic congestion occurs.
7.5.2
Configuring WRED Profiles
This section includes:
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