Configuring QoS OmniSwitCongestion Avoidance
OmniSwitch AOS Release 8 Network Configuration Guide December 2017 page 26-20
When enabled, WRP 1 applies the following color threshold values only to TCP traffic:
The minimum and maximum threshold values are a percentage of the maximum average queue length.
The OmniSwitch 6900 average queue length is calculated as follows:
1 Total Number of Cells : 46080
2 Total Number of Ports : 64
3 Number of Queuss : 8
4 Total Number of Queues: 64 * 8 = 512
5 Maximum Queue length calculated at full load : 46080 /512 = 90
When congestion of green, yellow and red traffic occurs without WRED, green has the highest precedence
and red and yellow are dropped. When congestion of yellow and red traffic occurs without WRED, yellow
and red have the same precedence.
The following is a many-to-one example, where one egress port is congested with multiple color TCP
traffic of the same priority.
Color
Min
Threshold
Max
Threshold
Drop
Probability
Gain
Red 10% 50% 36% 9
Yellow 50% 90% 30% 9
Green 90% 100% 24% 9
WRED Enabled WRED Disabled
Input Output
100% Green
100% Yellow 100% Green 100% Green
100% Red
100% Yellow 90-95% Yellow 50% Yellow
100% Red 0-5% Red 50% Red
80% Yellow 70-75% Yellow 55% Yellow
60% Red 25-30% Red 45% Red
90% Yellow 80-85% Yellow 60% Yellow
70% Red 15-20% Red 40% Red
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