The SNMP Custom Advanced sensor monitors numeric values returned for object identifiers (OID) via the Simple Network Management Protocol (SNMP).
The SNMP Library sensor automatically creates SNMP Custom Advanced sensors when the Management Information Base (MIB) file that you import contains single values.
SNMP Custom Advanced Sensor
For a detailed list and descriptions of the channels that this sensor can show, see section Channel List.
Sensor in Other Languages
Dutch: SNMP Aanpasbaar Geavanceerd
French: SNMP personnalisé avancé
German: SNMP (Benutzerdef. erweitert)
Japanese: SNMP カスタムアドバンスト
Portuguese: SNMP (customizado / avançado)
Russian: Дополнительные пользовательские параметры SNMP
Simplified Chinese: SNMP 自定义高级
Spanish: SNMP (personalizado / avanzado)
Remarks
It might not work to query data from a probe device via SNMP (querying localhost, 127.0.0.1, or ::1). Add this device to PRTG with the IP address that it has in your network and create the SNMP sensor on this device instead.
This sensor supports the IPv6 protocol.
This sensor has a low performance impact.
This sensor is capable of using lookups to determine the status value of one or more channels. Select Lookup as Channel #xUnit and define the lookup file in Channel #x Lookup.
The Add Sensor dialog appears when you manually add a new sensor to a device. It only shows the settings that are required to create the sensor. You can change nearly all settings on the sensor's Settings tab after creation.
OID Settings
Setting
Description
Value Type
Select the expected numeric type of the results at the OID:
Absolute (unsigned integer): Integers without an operational sign, such as 10 or 120.
Absolute (signed integer): Integers with an operational sign, such as -12 or 120.
Absolute (float): Float values, such as -5.80 or 8.23.
Delta (counter): Counter values. PRTG calculates the difference between the last and the current value. PRTG additionally divides the delta value by a time period to indicate a speed value. This mode only works if the difference between the last and the current value is positive and increases with each scanning interval. This mode does not support negative values and decreasing values.
Absolute (float) and Delta (counter) are not compatible with the unit Lookup.
Channel #2 - #10
You can define up to 10 channels. You must define at least one data channel, so you see all available settings for Channel #1. Specify how to handle all other possible channels:
Disable: Do not create this channel.
Enable: Create this channel.
It is not possible to enable or disable channels after sensor creation.
Basic Sensor Settings
Click the Settings tab of a sensor to change its settings.
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?
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:
snmpcustomsensor
snmpcustomadvanced
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 ().
Usually, a sensor connects to the IP Address/DNS Name of the parent device. See the device settings for details. For some sensors, you can explicitly define the monitoring target in the sensor settings.
OID Settings
OID Settings
Setting
Description
Channel #x Name
Enter a name for the channel in which the sensor shows the results at the OID. Enter a string.
Channel #x OID
Enter the OID of the SNMP object from which you want to receive numeric data.
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.
Channel #x Value Type
Shows the value type of the numeric data that this sensor receives from the OID.
PRTG shows this value for reference purposes only. If you need to change this value, add the sensor anew.
Channel #x Unit
Define the unit of the numeric data that this sensor receives from the OID:
BytesBandwidth
BytesMemory
BytesDisk
Temperature
Percent
TimeResponse
TimeSeconds
TimeHours
Count
CPU
BytesFile
SpeedDisk
SpeedNet
Custom
Lookup
For more information about the available units, see section Custom Sensors.
To use lookups with this channel, select Lookup and define the lookup file in Channel #x Lookup. Do not use Custom if you use lookups with this sensor.
You cannot use the unit Lookup if you select the value type Delta (counter) or Absolute (float). You are not able to create the sensor in this case.
Channel #x Custom Unit
This setting is only visible if you select the channel unit Custom above. Define a unit for the channel value. Enter a string.
Channel #x Lookup
This setting is only visible if you select the channel unit Lookup above. Select a lookup file that you want to use with this channel.
Channel #2 - #10
Shows if the channel is enabled or disabled.
PRTG shows this value for reference purposes only. If you need to change this value, add the sensor anew.
Sensor Display
Sensor Display
Setting
Description
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 enable Stack channels on top of each other as Graph Type. 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.
Inherited Settings
By default, all of these settings are inherited from objects that are higher in the hierarchy. We recommend that you change them centrally in the root group settings if necessary. To change a setting for this object only, click under the corresponding setting name to disable the inheritance and to display its options.
For more information, see section Root Group Settings, section Scanning Interval.
Schedules, Dependencies, and Maintenance Window
You cannot interrupt the inheritance for schedules, dependencies, and maintenance windows. The corresponding settings from the parent objects are always active. However, you can define additional schedules, dependencies, and maintenance windows. They are active at the same time as the parent objects' settings.
Schedules, Dependencies, and Maintenance Window
For more information, see section Root Group Settings, section Schedules, Dependencies, and Maintenance Window.
Access Rights
Access Rights
For more information, see section Root Group Settings, section Access Rights.
Channel List
Which channels the sensor actually shows might depend on the target device, the available components, and the sensor setup.
Channel
Description
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
[Value]
The numeric value for a specified OID (up to 10 OIDs are possible) that refers to a specific SNMP device
More
KNOWLEDGE BASE
How do I find out which OID I need for an SNMP Custom sensor?