Network Management

List Resources not showing all interfaces in NPM

This article provides brief information and steps to resolve the issue when using list resources on a node and not all interfaces are showing up. This may be seen most often when doing list resources on a switch that has a large number of interfaces. Information is not being retrieved via SNMP before the SNMP timeout period.

First published date

10/19/2018 9:46 PM

Last published date

4/29/2025 10:40 PM

Overview

When performing individual node discovery using list resources on a node, not all interfaces are showing up. This problem is quite often seen when doing list resources on a switch which has large number of interfaces.

There is no defined limit on the number of items which can be returned by List Resources. There is however, a timeout value which you could be running into. Each device is different. Some will return 5000 interfaces in 5min, while others might take hours

Product section

Network Performance Monitor

Cause

  • SNMP timeout period is lower then that is required for this SNMP Get query to complete to show all interfaces..
  • List resource times out on a certain OID.
  • SNMP version incompatibility

Resolution

Workaround 1:

  1. Ensure the Node having an issue is not monitored repeatedly from the same polling engine.
  2. Access the "Polling Settings" page.
  3. Set "SNMP Timeout" higher. Maximum is 10000 ms.
  4. Click Submit.
  5. Try to List Resources again.

Note: Sometimes the List Resources page shows a button called " Force Re-fresh" if you click on that it will list those missing resources.

If the above does not display all the interfaces, running a network discovery on the node will sometimes be able to find the interfaces the list resources could not.

You may want to check with the vendor on why it is timing out on a certain OID. 

Workaround 2:

  1. Edit the Node Properties
  2. Change the version from SNMPv2 to SNMPv1
  3. Save
  4. Try again (List Resource)

Workaround 3:

  1. Ran an SNMP Walk on the non-working device.
  2. Check the SNMP Walk if it is pointing to the correct name.
  3. Check if the IP Address it using NAT and make sure that it is using the correct IP Address.