Enterasys Networks CSX6000, CSX5500, CSX7000 manual USER’S Guide

USER’S GUIDE

Sample rate 5

Window 3

Trigger 2

Utilization 50%

50%

Time 5		0 of 1
10		1 of 2
15	Sliding Window	1 of 3
20		1 of 3
25		1 of 3
30		2 of 3 Overload condition met
35		0 of 1

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.

370 CyberSWITCH