Cisco Entity Sensor Measured Entity

1.3.6.1.4.1.9.9.91.1.1.1.1.8

This object identifies the physical entity for which the sensor is taking measurements. For example, for a sensor measuring the voltage output of a power-supply, this object would be the entPhysicalIndex of that power-supply; for a sensor measuring the temperature inside one chassis of a multi-chassis system, this object would be the enPhysicalIndex of that chassis. This object has a value of zero when the physical entity for which the sensor is taking measurements can not be represented by any one row in the entPhysicalTable, or that there is no such physical entity.