Administrator Guide

Setting the rmon Alarm
To set an alarm on any MIB object, use the rmon alarm or rmon hc-alarm command in GLOBAL CONFIGURATION mode.
● Set an alarm on any MIB object.
CONFIGURATION mode
[no] rmon alarm number variable interval {delta | absolute} rising-threshold [value
event-number] falling-threshold value event-number [owner string]
OR
[no] rmon hc-alarm number variable interval {delta | absolute} rising-threshold value
event-number falling-threshold value event-number [owner string]
Configure the alarm using the following optional parameters:
○ number: alarm number, an integer from 1 to 65,535, the value must be unique in the RMON Alarm Table.
○ variable: the MIB object to monitor — the variable must be in SNMP OID format; for example, 1.3.6.1.2.1.1.3. The
object type must be a 32-bit integer for the rmon alarm command and 64 bits for the rmon hc-alarm command.
○ interval: time in seconds the alarm monitors the MIB variable, the value must be between 1 to 3,600.
○ delta: tests the change between MIB variables, this option is the alarmSampleType in the RMON Alarm table.
○ absolute: tests each MIB variable directly, this option is the alarmSampleType in the RMON Alarm table.
○ rising-threshold value: value at which the rising-threshold alarm is triggered or reset. For the rmon alarm
command, this setting is a 32-bits value, for the rmon hc-alarm command, this setting is a 64-bits value.
○ event-number: event number to trigger when the rising threshold exceeds its limit. This value is identical to the
alarmRisingEventIndex in the alarmTable of the RMON MIB. If there is no corresponding rising-threshold event, the value
should be zero.
○ falling-threshold value: value at which the falling-threshold alarm is triggered or reset. For the rmon alarm
command, this setting is a 32-bits value, for the rmon hc-alarm command this setting is a 64 bits value.
○ event-number: event number to trigger when the falling threshold exceeds its limit. This value is identical to the
alarmFallingEventIndex in the alarmTable of the RMON MIB. If there is no corresponding falling-threshold event, the
value should be zero.
○ owner string: (Optional) specifies an owner for the alarm, this setting is the alarmOwner object in the alarmTable of
the RMON MIB. Default is a null-terminated string.
To disable the alarm, use the no form of the command.
The following example configures RMON alarm number 10. The alarm monitors the MIB variable 1.3.6.1.2.1.2.2.1.20.1
(ifEntry.ifOutErrors) once every 20 seconds until the alarm is disabled, and checks the rise or fall of the variable. The alarm is
triggered when the 1.3.6.1.2.1.2.2.1.20.1 value shows a MIB counter increase of 15 or more (such as from 100000 to 100015). The
alarm then triggers event number 1, which is configured with the RMON event command. Possible events include a log entry or
an SNMP trap. If the 1.3.6.1.2.1.2.2.1.20.1 value changes to 0 (falling-threshold 0), the alarm is reset and can be triggered again.
Dell(conf)#rmon alarm 10 1.3.6.1.2.1.2.2.1.20.1 20 delta rising-threshold
15 1 falling-threshold 0 1 owner nms1
Configuring an RMON Event
To add an event in the RMON event table, use the rmon event command in GLOBAL CONFIGURATION mode.
● Add an event in the RMON event table.
CONFIGURATION mode
[no] rmon event number [log] [trap community] [description string] [owner string]
○ number: assign an event number in integer format from 1 to 65535. The number value must be unique in the RMON
event table.
○ log: (Optional) enter the keyword log to generate an RMON event log, it sets the eventType to either log or log-and-
snmptrap in the RMON event table. The default is None.
○ trap community: (Optional) enter the keyword trap and SNMP community string to generate SNMP traps for an
RMON event entry, it sets the eventType to either snmptrap or log-and-snmptrap in the RMON event table. This option
generates syslog as well along with SNMP traps.
○ description string: (Optional) specifies a description of the event, which is identical to the event description in
the eventTable of the RMON MIB. The default is a null-terminated string.
Remote Monitoring (RMON)
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