PRTG Manual: SNMP Custom v2 Sensor

Sensor Name

Enter a name to identify the sensor. By default, PRTG shows this name in the device tree, as well as in alarms, logs, notifications, reports, maps, libraries, and tickets.

If the name contains angle brackets (<>), PRTG replaces them with braces ({}) for security reasons. For more information, see the Knowledge Base: What security features does PRTG include?

Parent Tags

The tags that the sensor inherits from its parent device, parent group, and parent probe.

This setting is for your information only. You cannot change it.

Tags

Enter one or more tags. Confirm each tag with the Spacebar key, a comma, or the Enter key. You can use tags to group objects and use tag-filtered views later on. Tags are not case-sensitive. Tags are automatically inherited.

It is not possible to enter tags with a leading plus (+) or minus (-) sign, nor tags with parentheses (()) or angle brackets (<>).

For performance reasons, it can take some minutes until you can filter for new tags that you added.

The sensor has the following default tags that are automatically predefined in the sensor's settings when you add the sensor:

• snmp
• snmpcustomsensor

Priority

Select a priority for the sensor. This setting determines the position of the sensor in lists. The highest priority is at the top of a list. Choose from the lowest priority () to the highest priority ().

OID or ASN.1 MIB Name

Enter the OID or ASN.1 MIB name of the SNMP object that you want to receive numeric data from.

Most OIDs begin with 1.3.6.1. However, OIDs that start with 1.0, or 1.1, or 1.2 are also allowed. If you want to entirely disable the validation of your entry, add the string norfccheck: to the beginning of the OID, for example, norfccheck:2.0.0.0.1.

Value Type

Select the expected numeric type of the result:

• Absolute (unsigned integer) (default): Integers without an operational sign, such as 10 or 120.
• Absolute (signed integer): Integers with an operational sign, such as -12 or 120.
• Absolute (floating point): Float values, such as -5.80 or 8.23.
• Delta (unsigned integer): Integers without an operational sign, such as 10 or 120. The sensor calculates the difference between the last value and the current value.
• Time (unsigned integer): Integers without an operational sign, such as 10 or 120. The sensor measures the response time.

You cannot change this value after sensor creation.

Channel Unit

Define the unit of the numeric data that this sensor receives. The following options are only visible if you select Absolute (unsigned integer), Absolute (signed integer), Absolute (floating point), or Delta (unsigned integer) as Value Type:

• Custom
• Count (default)
• Percent (CPU)
• Temperature (°C)
• Bytes (memory)
• Bytes (disk)
• Bytes (bandwidth)
• Bytes per second (disk)
• Bytes per second (network)

The following options are only visible if you select Time (unsigned integer) as Value Type:

• Time (milliseconds)
• Time (seconds, default)
• Time (hours)

For more information about the available units, see section Custom Sensors.

You cannot change this value after sensor creation.

Multiplication

If you want to multiply the received data with a certain value, enter the multiplier. Use the default value 1 to not change the received value. Enter an integer.

Division

If you want to divide the received data by a certain value, enter the divisor. Use the default value 1 to not change the received value. Enter an integer.

Primary Channel

Select a channel from the list to define it as the primary channel. In the device tree, the last value of the primary channel is always displayed below the sensor's name. The available options depend on what channels are available for this sensor.

You can set a different primary channel later by clicking below a channel gauge on the sensor's Overview tab.

Graph Type

Define how different channels are shown for this sensor:

• Show channels independently (default): Show a graph for each channel.
• Stack channels on top of each other: Stack channels on top of each other to create a multi-channel graph. This generates a graph that visualizes the different components of your total traffic.
  You cannot use this option in combination with manual Vertical Axis Scaling (available in the channel settings).

Stack Unit

This setting is only visible if you select Stack channels on top of each other above.

Select a unit from the list. All channels with this unit are stacked on top of each other. By default, you cannot exclude single channels from stacking if they use the selected unit. However, there is an advanced procedure to do so.

Result Handling

Define what PRTG does with the sensor result:

Do not store the sensor result.

Store the last sensor result in the \Logs\sensors subfolder of the PRTG data directory on the probe system. The file names are Result of Sensor [ID].txt and Result of Sensor [ID].Data.txt. This setting is for debugging purposes. PRTG overwrites these files with each scanning interval.

In a cluster, PRTG stores the result in the PRTG data directory of the master node.

Downtime

In the channel table on the Overview tab, this channel never shows any values. PRTG uses this channel in graphs and reports to show the amount of time in which the sensor was in the Down status

Result

The single numeric value for a specified OID

This channel is the primary channel by default.