Extreme Networks EPICenter 4.1, Руководство по установке программного обеспечения

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Defining Alarms
EPICenter Software Installation and User Guide 131
• Category — The category assigned to this alarm. Select the category using the pull-down menu at
the end of the field (see the section “Creating a New Alarm Category” on page 138 for more
information). This defines the variable alarmCategory.
• Severity — The severity of the alarm. Select one of the five severity levels from the pull-down menu
(normal, warning, minor, major, critical). This defines the variable alarmSeverity. The severity level
also determines the sound that will be played as an audible alert.
• Event Type — The type of event (SNMP trap, RMON Trap Rising Alarm, RMON Trap Falling
Alarm, EPICenter, or Syslog message). This determines the list of events you can select in the Event
Name field.
An EPICenter event is generated by EPICenter based on the results of its periodic polling. In some
cases, a condition that causes an EPICenter event may also generate an SNMP or other trap. Creating
an alarm triggered by an EPICenter event guarantees that the condition will eventually be detected
by polling even if the corresponding trap is missed.
See Appendix Efor a description of the EPICenter and SNMP events supported by the EPICenter
Alarm System.
Certain SNMP events require configuration on the switch in order to enable specific trap conditions.
RMON events (including Port utilization, temperature, or STP topology change events) and events
based on CPU utilization, are defined through the Threshold Configuration page of the EPICenter
Alarm System. RMON event rules can be configured only on switches running ExtremeWare 6.1 or
later. CPU Utilization rules can only be configured on switches running ExtremeWare 6.2 or later.
To receive Syslog messages, the Syslog receiver function of EPICenter must be enabled, and remote
logging must be enabled with EPICenter configured as a Syslog receiver on the devices from which
you want to receive Syslog messages. See “Configuring EPICenter as a Syslog Receiver” on page 153
for more information. Syslog messages received from devices not managed by EPICenter are
ignored.
For certain other events, you must do the configuration on the switch using an SNMP configuration
tool such as SNMPc. See “Configuring Other SNMP Trap Events” on page 152 for more information.
The event type is concatenated with the event name to define the variable eventTypeName.
• Event Name — The specific event (trap) that should trigger this alarm. Select the event from the
pull-down list provided. For RMON Rising or RMON Falling trap types, the RMON rule name is
used as the event name. The full-down list includes the configured RMON rule names. See
Appendix E for a description of the EPICenter and SNMP events from which you can choose.
The event name is concatenated with the event type to define the variable eventTypeName.
• Pattern Matching on Event Data — You can specify that the alarm should be triggered only if the
data provided with the event matches a specific pattern. If you leave this unchecked, the default is
“Don’t Care.” Pattern matching is done on the contents of the eventData variable.
The pattern matching syntax uses regular expressions. You can use “*” or “%” (asterisk or percent) to
match any sequence of zero or more characters. “?” or “_” (question mark or underscore) can be
used to match any one character.
To match one of a set of characters, enclose the characters in brackets. For example, [abcd] will match
one of a, b, c, or d.
• Message — A message you specify that will be transmitted whenever the alarm occurs. By default,
this field contains the variable eventTypeName. You can delete this variable, add other variables as
provided in the variable pop-up list, and add your own text. For Syslog messages, use the eventData
variable to display the Syslog message.
• Variables... — A pop-up list that provides a list of variables you can select to include in the Message
field. See Table 4 for a definition of the Alarm System variables you can use in the message field.