Extreme Networks EPICenter 5.0, Руководство пользователя

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Using the EPICenter Alarm System
EPICenter Concepts and Solutions Guide 53
Figure 21: The Action tab of the New Alarm Definition window
b If you need to change the trap receiver configuration, click the Settings... button to the right of
the Forward trap to: line. This opens a configuration dialog where you can change the trap
receiver configuration.
4 Click OK to finish the alarm definition.
Threshold Configuration for RMON and CPU Utilization Alarms
Through EPICenter you can define threshold conditions that, when exceeded, will cause a trap event to
occur. You can define thresholds for CPU utilization and for a wide range of RMON variables. Several
RMON conditions, specifically for port utilization, temperature, and STP topology changes, have been
partially predefined to make the rule definition process easier. There are other SNMP traps supported
by the EPICenter Alarm System that are not included in the EPICenter threshold configuration function,
where the threshold conditions can be configured directly on the switch.
With threshold events, traps are generated based on comparing the value of the relevant sample
variable with the threshold value. You create rules that specify the threshold values, define the target
devices on which the event rules should be configured, and in turn use those rules in EPICenter alarm
definitions that specify the actions to be take when a sample value crosses the threshold specified in the
rule.
When you create a rule, you can specify both a Rising Threshold and a Falling Threshold, if
appropriate.
• A Rising Threshold means that a trap is generated when the value of the RMON variable increases
past the threshold value. If only a Rising threshold is specified, then no trap is generated if the value
decreases past the threshold.
• A Falling Threshold means that a trap is generated when the value of the RMON variable decreases
past the threshold value. If only a Falling threshold is specified, then no trap is generated if the value
increases past the threshold.