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Configuring System Monitoring Thresholds
Configuring System Monitoring Thresholds
Creating Events
The event command controls the generation and notification of threshold crossing events
configured with the alarm command. When a threshold crossing event is triggered, the rmon
event configuration optionally specifies whether an entry in the RMON-MIB log table be created
to record the occurrence of the event. It can also specify whether an SNMP notification (trap) be
generated for the event. There are two notifications for threshold crossing events, a rising alarm
and a falling alarm.
Creating an event entry in the RMON-MIB log table does not create a corresponding entry in the
7710 SR OS event logs. However, when the event is set to trap the generation of a rising alarm or
falling alarm notification creates an entry in the 7710 SR OS event logs and that is distributed to
whatever 7710 SR OS log destinations are configured: console, session, memory, file, syslog, or
SNMP trap destination. The 7710 SR OS logger message includes a rising or falling threshold
crossing event indicator, the sample type (absolute or delta), the sampled value, the threshold
value, the rmon-alarm-id, the associated rmon-event-id and the sampled SNMP object identifier.
The alarm command configures an entry in the RMON-MIB alarm table. The alarm command
controls the monitoring and triggering of threshold crossing events. In order for notification or
logging of a threshold crossing event to occur there must be at least one associated rmon event
configured.
The agent periodically takes statistical sample values from the MIB variable specified for
monitoring and compares them to thresholds that have been configured with the alarm command.
The alarm command configures the MIB variable to be monitored, the polling period (interval),
sampling type (absolute or delta value), and rising and falling threshold parameters. If a sample
has crossed a threshold value, the associated 'event' is generated.
Preconfigured CLI threshold commands are available. Preconfigured commands hide some of the
complexities of configuring RMON alarm and event commands and perform the same function. In
particular, the preconfigured commands do not require the user to know the SNMP object
identifier to be sampled. The preconfigured threshold configurations include memory warnings &
alarms and compact flash usage warnings and alarms.
Page 264
7710 SR OS Basic System Configuration Guide
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