The SNMP Custom Table sensor monitors entries from a table that is provided via the Simple Network Management Protocol (SNMP). You can create one new sensor per table row. For each sensor, you can define up to ten channels. Each channel shows the value of one defined table column.
The SNMP Library sensor automatically creates SNMP Custom Table sensors when the Management Information Base (MIB) file that you import contains tables.
SNMP Custom Table 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 Aangepaste Tabel
French: Table personnalisée (SNMP)
German: SNMP (Benutzerdef. Tabelle)
Japanese: SNMP カスタムテーブル
Portuguese: Tabela (customizada) (SNMP)
Russian: Нестандартная таблица SNMP
Simplified Chinese: SNMP 自定义表
Spanish: Tabla (personalizado) (SNMP)
Remarks
This sensor supports IPv6.
This sensor has a low performance impact.
This sensor can use lookups. Select Lookup as Channel #xUnit and define the lookup file in Channel #x Lookup.
It might not work to query data from a probe device via SNMP (querying localhost, 127.0.0.1, or ::1). Add this device with the IP address that it has in your network and create the sensor on this device instead.
The sensor shows you the table that the OID returns. Select the table rows that contain the data that you want to monitor. PRTG creates one sensor for each table row that you select.
Basic Sensor Settings
Basic Sensor Settings
Setting
Description
Sensor Name
Enter a name to identify the sensor. You can use the placeholders [tablename] and [rowidentifier]. PRTG replaces them with the name of the table and the identifying value of the chosen row respectively. You can select the column that provides the row identifier in the Identification Column option below.
You can also enter a valid OID that is part of a different SNMP table, for example, [1.3.6.1.2.1.2.2.1.2], to query information that the current table does not contain. PRTG adds the same index as in the original table to the OID.
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
snmpcustomtable
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 ().
SNMP Table
SNMP Table
Setting
Description
Table OID
Enter the object identifier (OID) of the SNMP table that you want to monitor. The OID must directly point to an object that represents an SNMP table. PRTG creates one SNMP Custom Table sensor for each table row that you select.
If you do not enter an OID, you cannot proceed with channel creation.
You cannot change this value after sensor creation.
Table Specific
Table Specific
Setting
Description
Identifier
This is the value of the column that you selected as the Identification Column during sensor creation. PRTG also displays it in the sensor name to distinguish it from other sensors you created for the same table with other table rows.
Identification Column
Define the identification column for the sensors that you want to create. The sensors use this column to uniquely identify each table row.
We recommend that you use a unique identification column because it allows the sensors to keep track of changing indexes.
The value of the column that you select as identification column replaces the [rowidentifier] in the sensor name. This lets you distinguish sensors that you create for the same SNMP table.
After sensor creation, this setting shows the table column that you chose as identification column.
Channel #x Name
Enter a name for the channel in which the sensor shows the desired result. Enter a string.
Channel #x Column
Select the table column that, together with the table row, points to the value that you want to monitor in this channel. You can choose between the available columns of the table that you monitor.
Channel #x 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.
See below for other channel settings that you can also change after sensor creation.
This sensor monitors numeric values only. Make sure that you do not select columns that return strings because they lead to the Downstatus. For example, if you monitor an ifTable, we recommend that you do not select an ifDescr column because this results in an error.
You cannot change this value after sensor creation.
Channel #x Unit
Define the unit of the data that this sensor receives in this channel:
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 Custom above.
Define a unit for the channel value. Enter a string.
Channel #x Lookup
This setting is only visible if you select Lookup above.
Select a lookup file that you want to use with this channel.
Channel #2 - #10
You can define up to 10 channels. You must define at least one 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.
All channels that you define during the creation of an SNMP Custom Table sensor are the same for all sensors for each table row.
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 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.
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 returned numeric values in up to ten channels per table row
More
KNOWLEDGE BASE
How do I find out which OID I need for an SNMP Custom sensor?