Temperature sensor threshold attributes lists the Temperature sensor threshold attributes.

Table 1. Temperature sensor threshold attributes

Attribute

Description

MajorAlarmThreshold

The attribute MajorAlarmThreshold is a value directly polled from the MIB. Temperature sensors are created based on entPhysicalIndex from the entPhysicalClass OID (1.3.6.1.2.1.47.1.1.1.1.5) having value of sensor(8). For each entPhysicalIndex, the entSensorThresholdIndex having a value of minor(10) from the entSensorThresholdSeverity OID (1.3.6.1.4.1.9.9.91.1.2.1.1.2) is selected. This is used to obtain the corresponding threshold value from the entSensorThresholdValue OID (1.3.6.1.4.1.9.9.91.1.2.1.1.4). Threshold value OIDs are part of the CISCO-ENTITY-SENSOR-MIB.

MibEntSensorThreshold

The attribute MibEntSensorThreshold is a value after computing Precision from entSensorPrecision. The precision is obtained from Entity MIB's entSensorPrecision attribute OID (1.3.6.1.4.1.9.9.91.1.1.1.1.3). The entSensorPrecision indicates the number of decimal places of precision in fixed-point sensor values.

  • If the entSensorPrecision is 1, the entSensorValue is divided by 10.

  • If the entSensorPrecision is 2, the entSensorValue is divided by 100.

  • If the entSensorPrecision is 3, the entSensorValue is divided by 1000.

  • If the entSensorPrecision is zero, the MibEntSensorThreshold will be zero.

CurrentValue

The attribute CurrentValue is a polled value from the MIB attribute entSensorValue after considering the entSensorPrecision attribute value. The entSensorPrecision indicates the number of decimal places of precision in fixed-point sensor values. The entSensorPrecision indicates the number of decimal places of precision in fixed-point sensor values.

  • If the entSensorPrecision is 1, the entSensorValue is divided by 10.

  • If the entSensorPrecision is 2, the entSensorValue is divided by 100.

  • If the entSensorPrecision is 3, the entSensorValue is divided by 1000.

  • If the entSensorPrecision is zero, the entSensorValue is considered as such for CurrentValue.

RelativeTemperatureThreshold

The attribute RelativeTemperatureThreshold is from the user specified Threshold Group. It indicates how close the current temperature value can be to the value that triggers an emergency shutdown, expressed as a percentage of the emergency shutdown value. For example, if the shutdown temperature is 50 degrees C and the RelativeTemperatureThreshold is 10%, the OutOfRange event is notified if the temperature exceeds 45 degrees C.

TemperatureHighThreshold

The attribute TemperatureHighThreshold value is populated from the Threshold Group. Though the TemperatureHighThreshold value is populated, it is considered only for the computation of HighThreshold when the MibEntSensorThreshold value is negative.

HighThreshold

The value for the attribute HighThreshold is computed from the MibEntSensorThreshold attribute’s value if it is greater than zero. If the value of MibEntSensorThreshold is negative, then the value is computed from attribute TemperatureHighThreshold’s value.