H3C Technologies H3C Intelligent Management Center - Manual (Page 621)

599
5. Click Save As Global Threshold or save the thresholds of the current evaluation task as global
thresholds.
Or, click Restore Global Threshold to use global thresholds for the current evaluation task.
Or, click Re-Evaluate to re-evaluate the completed or expired evaluation task according to the
current thresholds.
6. Click Back to return to the Task List page.
Calculating evaluation results
An evaluation task enters Evaluating state after the last data collection ends. In Evaluating state,
WSM analyzes collected data, uses thresholds to evaluate the quality of the WLAN, and generates
AP and client evaluation results.
WSM collects data every 15 minutes. WSM evaluates APs and clients by following these steps (an AP-
based evaluation task is taken as an example):
1. Evaluates the collected data:
a. Calculates the high-rate packet ratio.
WSM calculates high-rate outgoing and incoming packet ratios according to the predefined
thresholds.
If the high-rate 802.11b packet ratio threshold is 5.5 Mbps and an AP has sent 1000
802.11b packets in which the sending rates of 800 packets exceed 5.5 Mbps, the high-
rate packet ratio is 80%.
b. Calculates the score of each index.
WSM calculates the evaluation result for each AP index, which includes four classes:
excellent, good, fair, and bad. The score for each class is as follows:
− Excellent—100
− Good—80
− Fair—60
− Bad—40
If the high-rate outgoing packets ratio is 95% and the threshold for Excellent is 90%, the
evaluation result is Excellent and the score for high-rate outgoing packets is 100.
c. Calculates the evaluation result of a record.
Based on the score of each index, WSM calculates the score of a record through the
following formula:
Weight 1 × Index 1's score + Weight 2 × Index 2's score +……
WSM compares the final score with its system-defined standard. The standard is as follows:
− Excellent >= 85.00
− Good >= 70.00
− Fair >= 55.00
− Poor < 55.00
A simple example is listed below to illustrate the evaluation process of each record:
Assume thresholds for AP evaluation indexes are set as follows:
{
High-Rate Outgoing Packet Ratio (%)—Excellent >= 90.00, Good >= 80.00, Fair >= 60.00,
and Weight (%) 10.00.