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Note: Other than alarmStatus, you cannot modify any of the objects in the entry if the associated alarmStatus object is set to valid. |
To use alarmTable to monitor a MIB object, perform the following tasks:
To create an alarm entry, first create a new row in alarmTable using the alarmStatus object. For example, create alarm #1 using the UCD command-line utilities:
snmpset -Os -v2c router community alarmStatus.1 i createRequest
Once you have created the new row in alarmTable, configure the following Alarm MIB objects:
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Note: Other than alarmStatus, you cannot modify any of the objects in the entry if the associated alarmStatus object is set to valid. |
The interval, in seconds, over which data is sampled and compared with the rising and falling thresholds. For example, to set alarmInterval for alarm #1 to 30 seconds, use the following SNMP Set request:
snmpset -Os -v2c router community alarmInterval.1 i 30
The object identifier of the variable to be sampled. During a Set request, if the supplied variable name is not available in the selected MIB view, a badValue error is returned. If at any time the variable name of an established alarmEntry is no longer available in the selected MIB view, the probe changes the status of alarmVariable to invalid. For example, to identify ifInOctets.61 as the variable to be monitored, use the following SNMP Set request:
snmpset -Os -v2c router community alarmVariable.1 o .1.3.6.1.2.1.2.2.1.10.61
The method of sampling the selected variable and calculating the value to be compared against the thresholds. If the value of this object is absoluteValue, the value of the selected variable is compared directly with the thresholds at the end of the sampling interval. If the value of this object is deltaValue, the value of the selected variable at the last sample is subtracted from the current value, and the difference is compared with the thresholds. For example, to set alarmSampleType for alarm #1 to deltaValue, use the following SNMP Set request:
snmpset -Os -v2c router community alarmSampleType.1 i deltaValue
The value of the variable during the last sampling period. This value is compared with the rising and falling thresholds. If the sample type is deltaValue, this value equals the difference between the samples at the beginning and end of the period. If the sample type is absoluteValue, this value equals the sampled value at the end of the period.
An alarm that is sent when this entry is first set to valid. If the first sample after this entry becomes valid is greater than or equal to risingThreshold, and alarmStartupAlarm is equal to risingAlarm or risingOrFallingAlarm, then a single rising alarm is generated. If the first sample after this entry becomes valid is less than or equal to fallingThreshold and alarmStartupAlarm is equal to fallingAlarm or risingOrFallingAlarm, then a single falling alarm is generated. For example, to set alarmStartupAlarm for alarm #1 to risingOrFallingAlarm, use the following SNMP Set request:
snmpset -Os -v2c router community alarmStartupAlarm.1 i risingOrFallingAlarm
A threshold for the sampled variable. When the current sampled value is greater than or equal to this threshold, and the value at the last sampling interval is less than this threshold, a single event is generated. A single event is also generated if the first sample after this entry becomes valid is greater than or equal to this threshold, and the associated alarmStartupAlarm is equal to risingAlarm or risingOrFallingAlarm. After a rising event is generated, another rising event cannot be generated until the sampled value falls below this threshold and reaches alarmFallingThreshold. For example, to set alarmRisingThreshold for alarm #1 to 100000, use the following SNMP Set request:
snmpset -Os -v2c router community alarmRisingThreshold.1 i 100000
A threshold for the sampled variable. When the current sampled value is less than or equal to this threshold, and the value at the last sampling interval is greater than this threshold, a single event is generated. A single event is also generated if the first sample after this entry becomes valid is less than or equal to this threshold, and the associated alarmStartupAlarm is equal to fallingAlarm or risingOrFallingAlarm. After a falling event is generated, another falling event cannot be generated until the sampled value rises above this threshold and reaches alarmRisingThreshold. For example, to set alarmFallingThreshold for alarm #1 to 10000, use the following SNMP Set request:
snmpset -Os -v2c router community alarmFallingThreshold.1 i 10000
Any text string specified by the creating management application or the CLI. Typically, it is used to identify a network manager (or application) and can be used for fine access control between participating management applications.
The index of the eventEntry object that is used when a rising threshold is crossed. If there is no corresponding entry in eventTable, then no association exists. If this value is zero, no associated event is generated because zero is not a valid event index. For example, to set alarmRisingEventIndex for alarm #1 to 10, use the following SNMP Set request:
snmpset -Os -v2c router community alarmRisingEventIndex.1 i 10
The index of the eventEntry object that is used when a falling threshold is crossed. If there is no corresponding entry in eventTable, then no association exists. If this value is zero, no associated event is generated because zero is not a valid event index. For example, to set alarmFallingEventIndex for alarm #1 to 10, use the following SNMP Set request:
snmpset -Os -v2c router community alarmFallingEventIndex.1 i 10
To activate a new row in alarmTable, set alarmStatus to valid using an SNMP Set request:
snmpset -Os -v2c router community alarmStatus.1 i valid
To modify an active row, first set alarmStatus to underCreation using an SNMP Set request:
snmpset -Os -v2c router community alarmStatus.1 i underCreation
Then change the row contents using an SNMP Set request:
snmpset -Os -v2c router community alarmFallingThreshold.1 i 1000
Finally, activate the row by setting alarmStatus to valid using an SNMP Set request:
snmpset -Os -v2c router community alarmStatus.1 i valid
To deactivate a row in alarmTable, set alarmStatus to invalid using an SNMP Set request:
snmpset -Os -v2c router community alarmStatus.1 i invalid
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