Chapter 7: Quality of Service (QoS)
Configuring WRED
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Configuring WRED
This section includes:
Assigning WRED Profiles to Queues
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.
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.
Configuring WRED Profiles
This section includes:
Adding a WRED Profile
To add a WRED profile:
1.
Select Ethernet > QoS > WRED > WRED Profile. The WRED Profile page opens.