SNMP

Monitor description

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

Note: The system hosting the Network Monitor server must have the Windows SNMP Service running to use SNMP monitoring. Any community specified by Network Monitor for monitoring must also be specified by the SNMP Service on the host machine. See Installation Checklist.

• System type: All
• Category: SNMP

SNMP monitor property page

Monitor specific properties

• Community - SNMP community to use. Defaults to public.
• OID1, 2, 3, ... - Specifies a list of numbered OIDs.
  • Click Add OID and Remove OID to add or remove OIDs to this monitor.
  • The [...] button next to the OID field display a MIB Browser dialog that can be used to select object identifiers from the remote SNMP agent.
• Calculation - A calculation using the values queried from the object 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. See below for example.
• Min/Max valid value - Enables the monitor to filter out all values below and above the given threshold.
• Port number - Port to use. Defaults to 161.
• Data type - The unit of data sampled by the test. This makes it possible to group data from this type of monitor with other monitors such as CPU utilization in reports.
• Compare value - Value to compare with the resulting value from the calculation.
• Value type - Type of value that is compared with the retrieved value.
• Operation - Operation to use when comparing.

Result translation

The result translation feature can be used to translate a non-descriptive OID value into a readable string. This feature is only available if the comparison value type is set to 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.