SNMP monitor

The SNMP monitor is a dynamic tool for querying multiple asset identifiers (OID) from an remote SNMP agent and perform calculations on the returned values.

Note: The community name, SNMP version, and port used used by Network Monitor to connect to an SNMP asset is set on the Authentication tab of an asset node. The asset node may inherit this setting from a parent node. See the Installation Checklist.

• System type: All
• Category: SNMP

Note: Only monitor specific settings are documented here. See Standard monitor settings.

Monitor specific settings

• OID1, 2, 3, ... - Specifies a list of numbered OIDs.
  • Click Add OID and Remove OID to add or remove OIDs to this monitor.
  • You can specify either a named OID or a OID in number format. If you specify a named OID, Network Monitor tries to resolve it to its number format automatically when the field loses focus. Network Monitor uses the currently compiled MIBs to attempt to find the number format of the OID.
  • The [...] button next to the OID field display a MIB Browser dialog that can be used to select asset identifiers from the remote SNMP agent.
  • When the MIB browser displays an OID number with a @string it means you can use this string as part of the OID. For example the OID .1.3.6.1.2.1.2.2.1.16@Intel(R) PRO/1000 MT Network Connection can be entered in the OID field instead of identifying the index number of the network connection.
• Calculation - A calculation using the values queried from the asset identifiers. The example in the image above calculates the network utilization from an interface.
• Result translation - Translates the result into a readable string. This option is only available when the value type in the comparison is set to string. The result translation feature can be used to translate a non-descriptive OID value into a readable string. The OID value retrieved can still be a numeric value, but is treated as a string.

  Example 1

  Unknown(1), Alarm(2), Failed(3), Ok(4)

  Example 2

  Unknown=1,Alarm=2,Failed=3,OK=4

  The values 1, 2, 3 and 4 are translated to Unknown, Alarm, Failed and OK. Both examples above are valid notations. The final translated string is the string used in the comparison operation.

• Valid values / min / max - Enables the monitor to filter out all values below and above the given threshold.
• Data type - The unit of data sampled by the test. This makes it possible to group data with other monitors using the same type in reports.
• Counter mode
  • Delta - Calculate the difference between the last test and the current test. Recommended when the value returned grows continuously.
  • Absolute value - Use the absolute value returned.
• Value type - Type of value that is compared with the retrieved value.
• Compare Operation - Operation to use when comparing.
• Compare value - Value to compare with the resulting value from the calculation.