Troubleshooting device discovery
This section contains troubleshooting tips for device discovery.
If NetIM does not discover any devices:
• Ensure that discovery seeds are supplied, either by a seed file or by having active device entries in the Device Manager.
• Verify that discovery seeds can be accessed using SNMP.
– Ensure that SNMP is enabled on seed devices.
– Ensure that SNMP (default SNMP port is 161) is not blocked between NetIM and the devices.
– Verify that either SNMP v1/v2c community strings or SNMP v3 USM credentials for the seed devices are present in credentials file.
– Check SNMP timeouts to ensure they are not too low for the network.
– Use the MIB browser packaged with NetIM (app.sh MIB_BROWSER) to determine if seed devices can be accessed using SNMP.
This is a UI-based utility. You must use X or an xrdp session.
If the adapter does not discover a specific device or set of devices that is known to exist:
• Verify that the devices can be accessed using SNMP.
– Ensure that SNMP is enabled on undiscovered devices.
– Ensure that SNMP (default SNMP port is 161) is not blocked between NetIM and the devices.
– Verify that either SNMP v1/v2c community strings or SNMP v3 USM credentials for the undiscovered devices are present in the credentials file.
– Check SNMP timeouts to ensure they are not too low for the network.
– Use the MIB browser packaged with NetIM (app.sh mib_browser) to determine if undiscovered devices can be accessed using SNMP.
This is a UI-based utility. You must use X or an xrdp session.
• Check to see if IP addresses are being skipped.
– Ensure that the IP addresses for undiscovered devices are within the discovery range as specified by the Include and Exclude files.
If the SNMP discovery engine cannot discover a device or set of devices using the configured seeds and discovery boundaries, it may be necessary to add device IP addresses/subnets to the seed file.
If Device Discovery does not create any entries in the Device Manager:
• SNMP discovery may not have discovered any routers or switches.
• Filtering (device capability and/or vendor) configuration may be too restrictive.
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