Extreme Networks EPICenter Guide Manual page 54

Getting Started with EPICenter
If you want a trap event to occur for both Rising and Falling threshold conditions, you can specify both
thresholds.
There are other SNMP traps supported by the EPICenter Alarm System, but not included in the
threshold configuration function, that may require conditions to be set on the switch to define when a
trap should occur. See Appendix B, "Configuring Devices for Use with EPICenter" in the EPICenter
Reference Guide for additional information.
NOTE
Creating the rules that control trap (event) generation is only the first of the two steps required to create
EPICenter alarms for these events. Even though you have set up these rules, the trap events generated
as a result will be ignored by the Alarm System until you define alarms that take actions on those
events. See "Creating or Modifying an Alarm Definition" on page 46 for more information.
There are two parts to an event rule; the rule configuration itself, and the association of the rule to its
target devices.
NOTE
CPU Utilization is only supported on switches running ExtremeWare 6.2 or later. STP Topology change
traps are only supported on switches running ExtremeWare 6.2.2 or later.
A new RMON rule is added as a new "folder" in the Configuration Tree, and each target device for the
rule appears as a separate component under that rule. The rule name will also appear in the Event
Name list.
For CPU Utilization rules, each target device for a CPU utilization rule appears as a separate component
under the CPU Utilization "folder" in the Configurations tree.
• Startup Alarm: The condition that should be met to cause the initial occurrence of this event. Select
from the following:
— Rising: an event will be generated the first time the sample value becomes greater than or equal
to the Rising Threshold value. No events will be generated related to the Falling threshold until
after this has occurred.
— Falling: an event will be generated the first time the sample value becomes less than or equal to
the Falling Threshold value. No events will be generated related to the Rising threshold until
after this has occurred.
— RisingOrFalling: an event will be generated the first time the sample value becomes either
greater than or equal to the Rising Threshold value, or less than or equal to the Falling Threshold
value.
How RMON Events are Generated
When you configure an RMON threshold condition, you must specify not only the value of the
threshold, but also the startup alarm condition. The initial occurrence of an RMON alarm is determined
by the Startup Alarm condition specified when the alarm is defined.
It is important to understand that, except for the initial occurrence of the alarm, an RMON alarm event
will be generated only the when the sample value of the variable crosses one of the thresholds for the
first time after having crossed the other threshold.
54 EPICenter Concepts and Solutions Guide