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Trap thresholds are the upper and lower limits that you set for the network conditions and events that you are monitoring with SNMP. When these limits are exceeded, the TIBCO Messaging Appliance P-7500 systems report that a threshold has been exceeded. Alarms add to this reporting functionality by allowing you to configure an action to be taken if the threshold is exceeded.Alarms that are configured correctly can prevent inconvenient or even catastrophic network failures. The main advantage of alarms is that you can specify at exactly which point an action should take place, and you can tailor them to suit the normal operating conditions of your network.You can set a rising threshold and a falling threshold through the TIBCO Messaging Appliance P-7500 CLI for some of the enterprise-specific traps (refer to “Configuring Enterprise-specific Traps” on page 94 for details). The rising threshold triggers a status severity change when the threshold is exceeded. The falling threshold causes a status severity change when the excessive activity or abnormal condition has returned to normal.
Note: TIBCO recommends that you initially use the default threshold settings with TIBCO Messaging Appliance P-7500 systems to see how they apply to your network. After you assess your network's normal behavior, you can adjust the threshold and alarm settings on systems to make them more useful for your particular network.When determining the baseline for conditions that trigger an alarm on your network, observe these guidelines, as applicable:
• Set alarms for any peaks in network utilization. Pick a baseline value that covers most of your network traffic, ignoring any obvious one-time-only peaks. For example, as users log on at the start of the day, you see a large peak in network utilization. The alarm is triggered whenever such peaks occur.
• Set alarms for exceptional peaks in network utilization. Pick a baseline value that covers the highest possible peak seen when service was still provided. The alarm is triggered at levels higher than this peak, alerting you to the most serious utilization on your network.
• When you choose the baseline for error alarms, pick the lowest possible baseline so that the alarm is triggered by any peaks.For more exact monitoring and control over conditions that trigger an alarm on your network, TIBCO recommends you determine the hysteresis zone for each of the specified alarm values when determining the baseline for normal activity on your network. The hysteresis zone ensures that alarms are not triggered due to small fluctuations around the threshold value. Figure 2 shows an example of this alarm trigger mechanism.The hysteresis zone is the area where a value has fallen below the upper threshold (also called the rising threshold) but has not yet reached a lower threshold (also called the falling threshold). After a rising threshold generates an alarm, the value must fall below the falling threshold before another alarm is generated. For alarms that are set on falling thresholds, the rule is reversed.
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Copyright © TIBCO Software Inc. All Rights Reserved |