Abstract: There are provided a system, a method and a computer program product for managing one or more network devices. The one or more network devices are connected indirectly or directly to one or more networks and communicate each other by exchanging one or more messages. A classifier intercepts the one or more messages associated with one or more network devices. The classifier classifies each of the intercepted messages into a layer. A discovery system receives the each classified message and detecting, based on the each received classified message, a new network device added to the one or more networks and detecting one or more configuration changes made on the one or more network devices.