OpManager is now bundled with 39k Vendor Templates which helps in auto-classification of different vendor devices in case the device type is not listed in the default Device Templates list.
Having said that, to reduce the number of devices getting classified as 'Unknown', configure the correct credentials even before initiating discovery. Doing this saves a lot of time and effort on re-work.
Resolving Unknown devices in the devices already discovered:
For SNMP-enabled devices:
If the device supports SNMP, enable SNMP and rediscover the device. Despite this, if you face issues, troubleshoot as follows:
The router is discovered as Unknown if the IP Forwarding parameter of the device is set to false. To set the value of this parameter to true,
If you have decided to disable SNMP authentication on Unix-based servers, configure Telnet or SSH credentials and associate the credentials to the servers. Similarly, for Windows devices, configure WMI credentials and associate the credentials to the devices. Re-discover the devices with the new credential.