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Barracuda Managed Workplace

Adding a Monitor for SNMP Object Identifiers (OIDs)

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A Simple Network Management Protocol (SNMP) object identifier (OID) monitor checks for a specific piece of status or identification information. SNMP OIDs are found on many devices, including routers and access servers, switches and bridges, hubs, computer hosts or printers.

There are two types of MIBs: scalar and tabular. Scalar objects define a single object instance whereas tabular objects define multiple related object instances grouped in MIB tables.

You can create a tabular monitor for a known base OID, and Barracuda Managed Workplace will automatically create monitors for all elements within that table.

  • Onsite Manager pulls SNMP information from managed devices using a GET request, whereas SNMP traps are sent from the managed device to the Manager.
  • Onsite Manager pulls a maximum 1,024 scalar monitors from each tabular monitor definition.
  • If you add an SNMP monitor and set it as tabular, but the OID is scalar, nothing will be collected since there are no related OIDs.

To find out whether an OID is tabular or scalar, you can browse the MIB in Barracuda Managed Workplace using the Create SNMP for MIB monitoring page. See  Adding a Monitor for SNMP OIDs from MIB. Or you can use a tool such as iReasoning to perform an SNMP walk on the device. See Using iReasoning to Add SNMP OID Information to Service Center.

What You Can Do

You can

  • gather status information from network appliances
  • monitor all operating systems (Windows, Unix/Linux, Mac OS)
  • monitor environmental status, such as temperatures and fan speeds
  • collect information on firmware versions and device location
Understanding the Relationship Between Parent and Child Monitors

There are a few considerations regarding parent and child monitors that you must keep in mind when creating an SNMP OID monitor:

  • changing a parent's monitor or alert configuration does not change existing child monitors. It only affects new child monitors that are created after the changes are saved.
  • changing a child's monitor or alert configuration does not change the parent's configurations.
  • changing a child's monitor or alert configuration does not change other child monitor's configurations.
    • to stop the monitoring and alerting, the monitor has to be disabled.
    • to stop the monitor from being created, a regular expression needs to be used that will not detect it or disable the parent. Disabling the parent will also prevent other counters, that may be wanted, from being created.
  • deleting the parent monitor will delete all child monitors that were created by the parent, even if the child has been modified.
  • deleting the parent monitor does not delete child monitors that were created by other parent monitors.
  • disabling the parent does not disable existing child monitors.
  • disabling the child does not disable the parent or other child monitors.
To add a monitor for an SNMP OID
  1. In Service Center, click Configuration > Monitor & Alert Rules.
  2. From the Site list, select the site where the device is located.
  3. From the Device list, select the device to which you want to add a monitor.
  4. Click Add Monitor.
  5. Select SNMP from the list and click Add Monitor.

    The SNMP monitor type is only available if the device is SNMP enabled.

  6. In the Monitor tab, type a title for the monitor.
  7. Optionally, type a description for the monitor.
  8. Ensure the Enabled check box is selected.
  9. Select the New SNMP OID option button.
  10. In the Object Name box, type the OID text identifier.
  11. In the OID box, type the OID numeric value.
  12. From the Object Type list, select either NumericTextDate and Time, or Physical Address.
  13. To collect tabular OIDs, select the Tabular check box.
  14. In the Description box, type a description for the OID.
  15. If you selected the Tabular check box, select an appropriate time to from the Discovery Interval list to set how frequently tabular children scalar OIDs are captured.
  16. From the Polling Interval list, select an appropriate time to set how frequently the data is captured.
  17. Do one of the following to set when the monitor runs:
    • To set the monitor to run all the time, do nothing.
    • To change when the monitor runs, select either Daily Interval or Specific Interval from the list and use the corresponding lists to define the monitoring. Click OK.
  18. To configure an alert, see Setting Alert Actions.
  19. Click Save.
See Also

Adding or Deleting SNMP OIDs

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