Configuring System Monitoring Thresholds
322 Basic System Configuration Guide
Creating an event entry in the RMON-MIB log table does not create a corresponding entry in
the 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 event logs and that is distributed to whatever
log destinations are configured: console, session, memory, file, syslog, or SNMP trap
destination. The 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 and alarms and compact flash usage warnings and alarms.
To create events, use the following CLI:
CLI Syntax: config>system>thresholds# cflash-cap-warn cf1-B: rising-
threshold 2000000 falling-threshold 1999900 interval
240 trap startup-alarm either
config>system>thresholds# memory-use-alarm rising-
threshold 50000000 falling-threshold 45999999 interval
500 both startup-alarm either
config>system>thresh# rmon
config>system>thresh>rmon# event 5 both description
"alarm testing" owner "Timos CLI"
The following example displays the command output:
A:ALA-49>config>system>thresholds# info
----------------------------------------------
rmon
event 5 description "alarm testing" owner "Timos CLI"
exit
cflash-cap-warn cf1-B: rising-threshold 2000000 falling-threshold
1999900 interval 240 trap
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