Enterasys Networks CSX6000 - Manual (Page 370)

USER’S GUIDE
370 CyberSWITCH
After 5 seconds the sample is checked and the average utilization for the 5 seconds was 40 percent.
This is less than the configured utilization percentage of 50%, so no action is taken. For the second
sample rate period, the average throughput is 60%. This percentage is greater than the configured
utilization percentage, so the trigger must also be checked. At this point, only 2 samples have been
taken, and the configured window is for 3 samples. The overload condition needs to be met 2 times
(the trigger of 2) out of 3 samples (the window of 3) before any action is taken. This condition has
not been met.
The average throughput is 40% for the third sample rate period. This is less than the configured
utilization, so out of the last 3 samples (a sliding window is in use), 1 out of 3 samples have
throughput that is greater than the configured utilization. The overload condition has still not been
met. No extra calls are made.
After the fourth sample rate period (20 seconds have now passed), the first sample is dropped. The
average throughput for the new sample is below the configured utilization percentage. Therefore,
1 out of 3 samples have throughput that is greater than the configured utilization. No extra calls are
made.
After the fifth sample period, the second sample taken is dropped. The average throughput for the
new sample taken is 60%. But because the sample dropped was a sample that was greater than the
configured utilization, there still are only 1 out of 3 samples that are greater than the configured
utilization.
After the sixth sample period, the third sample taken is dropped. The average throughput for the
new sample is over the configured utilization. The trigger then has been met; two out of three
samples have met the overload condition. An extra call will be added, and the process will be reset.
Sample rate 5
Window 3
Trigger 2
Utilization 50%
50%
5
10
15
20
25
30
35
0 of 1
1 of 2
1 of 3
1 of 3
1 of 3
2 of 3 Overload condition met
0 of 1
Time
Sliding Window