User guide

ExtremeWare EPICenter Software Installation and User Guide 5-31
Event Configuration
For a more detailed discussion of Remote Network Monitoring alarm behavior, refer to a
book such as SNMP, SNMPv2, SNMPv3, and RMON 1 and 2,
Third Edition, by William
Stallings (Addison-Wesley, 1999).
CPU Utilization Rule Configuration
CPU Utilization is only supported on switches running ExtremeWare 6.2 or later.
If you select CPU Utilization as the Configuration Type, the remaining fields and buttons
in this window are defined as follows:
• Name: CPU Utilization, the name for this rule. There can only be one rule of this type
on a device, so the name is predefined.
• MIB Variable:
extremeCpuUtilRisingThreshold.0, the MIB variable that this rule
will monitor. This is also predefined.
• Description: The description of the
extremeCpuUtilRisingThreshold MIB variable.
• Rising Threshold: A threshold value, in percent, that will trigger an event when the
CPU utilization rises past this value. This value is also used to compute a falling
threshold, which is defined as 90% of the risingthreshold.
Although you can define only a Rising Threshold value for CPU Utilization, you
can define alarms for both CPU Utilization Rising Threshold events and CPU
Utilization Falling Threshold events. The Alarm Definition process lets you
create two separate alarms related to CPU Utilization, based on this one rule.
If you define an alarm for CPU Utilization Rising Threshold events, an alarm will be
generated each time the sample value meets the following conditions:
— When the sample value becomes greater than or equal to the Rising Threshold for
the first time (including the initial sample) after the alarm is enabled.
— The first time the sample value becomes greater than or equal to the Rising
Threshold, after having become less than orequal to the Falling Threshold (90% of the
Rising threshold).
If you define an alarm for CPU Utilization Falling Threshold events, an event will be
generated each time the sample value meets the following conditions:
— The first time the sample value becomes less than or equalto 90% of the Rising
Threshold, after having become greater than or equal to the Rising Threshold.
Severalofthe values youcan set foran RMONevent arepredefined in the Extreme switch
agent for CPU utilization. These are: