PRTG Manual: SNMP Custom Advanced Sensor
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.
For a detailed list and descriptions of the channels that this sensor can show, see section Channel List.
- 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)
Consider the following remarks and requirements for this sensor:
Remark |
Description |
---|---|
IPv6 |
This sensor supports IPv6. |
Performance impact |
This sensor has a low performance impact. |
Lookups |
This sensor can use lookups. Select Lookup as Channel #x Unit and define the lookup file in Channel #x Lookup. |
Localhost |
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. |
Knowledge Base |
Knowledge Base: How do I find out which OID I need for an SNMP Custom sensor? |
The sensor has the following default tags that are automatically predefined in the sensor's settings when you add the sensor:
- snmpcustomadvanced
- snmpcustomsensor
For more information about basic sensor settings, see section Sensor 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 |
Select the expected numeric type of the results at the OID:
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. You cannot change this value after sensor creation. |
Channel #x Unit |
Define the unit of the numeric data that this sensor receives from the OID:
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:
It is not possible to enable or disable channels after sensor creation. |
Setting |
Description |
---|---|
Primary Channel |
Select a channel from the list to define it as the primary channel. In the device tree, PRTG displays the last value of the primary channel 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 this sensor shows different channels:
|
Stack Unit |
This setting is only visible if you select Stack channels on top of each other above. Select a unit from the list. PRTG stacks all channels with this unit 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. |
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 Inheritance of Settings.
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 |
KNOWLEDGE BASE
How do I find out which OID I need for an SNMP Custom sensor?
What security features does PRTG include?
My SNMP sensors don’t work. What can I do?