Enterasys Networks CSX7000 User Manual download pdf (Page 370)

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101

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%

0 of 1

1 of 2

1 of 3

2 of 3 Overload condition met

0 of 1

Time

Sliding Window

1 2 ... 365 366 367 368 369 370 371 372 373 374 375 ... 728 729

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Enterasys Networks CSX7000 User Manual Page 370

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