You need to be able to perform several maintenance tasks using the sensor.
Remember that licensing is extremely important when it comes to the sensor modules and devices. A valid license is required to perform signature updates. If a valid services contract is valid on the sensor, the license can usually be retrieved automatically using either Cisco IPS Device Manager (IDM) or Cisco IPS Manager Express (IME).
Apply for the appropriate license at www.cisco.com/go/license.
Use the copy command with the keyword license-key to install.
If you’re using the IDM or IME, choose Configuration, Sensor Management, Licensing.
These are the three sensor image types: ...