System Management
310
Basic System Configuration Guide
3HE 11010 AAAC TQZZA Edition: 01
6.11 Configuring System Monitoring Thresholds
6.11.1 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 will be created to record the occurrence of the event. It can also
specify whether an SNMP notification (trap) will 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 7705 SAR 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
7705 SAR event logs and that is distributed to whatever 7705 SAR log destinations
are configured: console, session, memory, file, syslog, or SNMP trap destination.
The 7705 SAR 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 functions. 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.
To Next Page
Loading...
