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PRTG Manual: SNMP Traffic v2 Sensor

The SNMP Traffic v2 sensor monitors bandwidth and traffic on a device via the Simple Network Management Protocol (SNMP).

i_betaThis sensor is in beta status. The operating methods and the available settings are still subject to change. Do not expect that all functions work properly, or that this sensor works as expected at all.

SNMP Traffic v2 Sensor

SNMP Traffic v2 Sensor

i_square_cyanFor a detailed list and descriptions of the channels that this sensor can show, see section Channel List.

Sensor in Other Languages

  • Dutch: SNMP Traffic v2
  • French: SNMP Traffic v2
  • German: SNMP Traffic v2
  • Japanese: SNMP Traffic v2
  • Portuguese: SNMP Traffic v2
  • Russian: SNMP Traffic v2
  • Simplified Chinese: SNMP Traffic v2
  • Spanish: SNMP Traffic v2

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 with the IP address that it has in your network and create the sensor on this device instead.
  • This sensor supports IPv6.
  • This sensor has a very low performance impact.
  • This sensor is not affected by the following SNMP compatibility options set in the parent device: Port Name Template, Port Name Update, Port Identification, Start Interface Index, and End Interface Index.

Detailed Requirements

Requirement

Description

Enabled Beta Sensors experimental feature

This sensor requires that the Beta Sensors experimental feature of PRTG is enabled.

i_square_cyanFor more information, see the Knowledge Base: What are beta sensors and how can I use them?

Basic Sensor Settings

Basic Sensor Settings

Basic Sensor Settings

Setting

Description

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.

i_round_blueIf 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.

i_round_blueThis 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.

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

i_round_blueFor 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
  • snmptrafficsensor
  • bandwidthsensor

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 (i_priority_1) to the highest priority (i_priority_5).

SNMP Interface

SNMP Interface

SNMP Interface

Setting

Description

Description

The description of the interface in the physical device that this sensor monitors. The internal name is found in the ifTable under ifDescr.

i_round_redPRTG shows this value for reference purposes only. We strongly recommend that you only change it if the Paessler support team explicitly asks you to do so. Wrong usage can result in incorrect monitoring data.

64-Bit

If the interface that this sensor monitors uses 64-bit counters.

i_round_redPRTG shows this value for reference purposes only. We strongly recommend that you only change it if the Paessler support team explicitly asks you to do so. Wrong usage can result in incorrect monitoring data.

SNMP Traffic Specific

SNMP Traffic Specific

SNMP Traffic Specific

Setting

Description

Additional Channels

By default, each SNMP Traffic v2 sensor creates the channels Traffic In, Traffic Out, and Traffic Total. Select additional channels for all interfaces. Click the respective channel names to mark the channels and to monitor their data.

You can choose between the following additional channels:

  • Errors in and errors out: The number of incoming and outgoing packets that could not be delivered because of errors.
  • Discards in and discards out: The number of discarded incoming and outgoing packets even though no errors have been detected.
  • Unicasts in and unicasts out: The number of unicast packets that have been delivered.
  • Non-unicasts in and non-unicasts out: The number of non-unicast packets that have been delivered.
    i_round_redThese channels might not function properly with 64-bit interfaces.
  • Multicasts in and multicasts out (64-bit only): The number of delivered packets that were addressed to a multicast address.
  • Broadcasts in and broadcasts out (64-bit only): The number of delivered packets that were addressed to a broadcast address.
  • Unknown protocols in: The number of received packets that were discarded because of an unknown or unsupported protocol.

i_round_redYou cannot delete additional channels later. You can only disable them.

i_round_blueIf the sensor shows the Warning status with the message Channels not available, you can disable the affected channels to remove the warning.

Connection Status Handling

Define how PRTG reacts when an interface is operational. An interface that is not operational is, for example, an Ethernet port on a switch with no cable plugged in. This setting is valid for all selected interfaces.

  • Show the 'Down' status anytime ifOperStatus is not 'Up': Show the Down status for a disconnected interface. This applies if the ifOperStatus of the interface is not 'up'.
  • Show the 'Down' status when ifAdminStatus is 'Up' but ifOperStatus is not: Show the Down status for a disconnected interface only if it is not deliberately deactivated in the configuration. This applies if the ifAdminStatus is 'up' and the ifOperStatus of the interface is not 'up'. The sensor stays in the Up status when the interface has been deactivated.
  • Ignore all disconnected states (default): Show the Up status.
    i_round_blueMonitoring is discontinued without notice.

Sensor Display

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.

i_round_blueYou can set a different primary channel later by clicking b_channel_primary 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.
    i_round_redYou cannot use this option in combination with manual Vertical Axis Scaling (available in the channel settings).
  • Show in and out traffic as positive and negative area graph: Show channels for incoming and outgoing traffic as positive and negative area graph. This visualizes your traffic in a clear way.
    i_round_redYou cannot use this option in combination with manual Vertical Axis Scaling (available in the channel settings). Manual scaling is not possible if you choose this option.
    i_round_redYou cannot show a positive/negative graph for a channel if you choose to display its data in percent of maximum (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.

Debug Options

Debug Options

Debug Options

Setting

Description

Result Handling

Define what PRTG does with the sensor result:

  • Discard result: Do not store the sensor result.
  • Store result: Store the last sensor result in the \Logs\sensors subfolder of the PRTG data directory on the probe system. The file name is Result of Sensor [ID].log. This setting is for debugging purposes. PRTG overwrites this file with each scanning interval.

i_round_redIf you select Store result, the sensor writes the standard error (stderr) streams in clear text to the last sensor result file. Do not return sensitive information via the scripts that you run with this sensor.

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

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 b_inherited_enabled under the corresponding setting name to disable the inheritance and to display its options.

i_square_cyanFor more information, see section Inheritance of Settings.

Scanning Interval

i_round_blueThe minimum scanning interval of this sensor is 1 minute.

i_round_blueThe recommended scanning interval of this sensor is 1 minute.

Scanning Interval

Scanning Interval

i_square_cyanFor more information, see section Root Group Settings, section Scanning Interval.

Schedules, Dependencies, and Maintenance Window

i_round_blueYou 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

Schedules, Dependencies, and Maintenance Window

i_square_cyanFor more information, see section Root Group Settings, section Schedules, Dependencies, and Maintenance Window (default).

Access Rights

Access Rights

Access Rights

i_square_cyanFor more information, see section Root Group Settings, section Access Rights.

Channel Unit Configuration

Channel Unit Configuration

Channel Unit Configuration

i_square_cyanFor more information, see section Root Group Settings, section Channel Unit Configuration.

Channel List

i_round_blueWhich channels the sensor actually shows might depend on the target device, the available components, and the sensor setup.

Channel

Description

Broadcasts In

The number of incoming broadcast packets

Broadcasts Out

The number of outgoing broadcast packets

Discards In

The number of incoming discards

Discards Out

The number of outgoing discards

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

Errors In

The number of incoming errors

Errors Out

The number of outgoing errors

Multicasts In

The number of incoming multicast packets

Multicasts Out

The number of outgoing multicast packets

Non-Unicasts In

The number of incoming non-unicast packets

Non-Unicasts Out

The number of outgoing non-unicast packets

Traffic In

The incoming traffic

Traffic Out

The outgoing traffic

Traffic Total

The total traffic

i_round_blueThis channel is the primary channel by default.

Unicasts In

The number of incoming unicast packets

Unicasts Out

The number of outgoing unicast packets

Unknown Protocols In

The number of incoming, unknown protocols

More

i_square_blueKNOWLEDGE BASE

Where is the volume line in graphs?

What security features does PRTG include?

SNMP Traffic sensor suddenly drops at 610Mbps

My SNMP sensors don’t work. What can I do?