Manually discovering a device or subnet

You can manually discover devices so that the network topology in Network Manager matches the network.

About this task

Sometimes you might know that one or more devices have had their configuration changed, and want to discover them again regardless of whether the system has detected the change from traps sent by the devices.

You can manually discover a device or subnet in the following ways:

You can use the Discovery Configuration GUI to specify individual devices or complete subnets to be discovered.
You can discover specific devices or sets of devices from the Hop View or Network Views.
You can make inserts to the finders.rediscovery table using ncp_oql, specifying the IP address or subnet to be discovered.

Note: Do not use manual discoveries to remove devices from the topology. Devices that are no longer accessible remain in the topology until their LingerTime reaches zero and another discovery is run, or until you remove them using the RemoveNode.pl script. Do manual discoveries only against devices that are operational but whose configuration has been changed.