1. A method for reconfiguring data network nodes in a data network, the method comprising the steps of: storing information comprising: a first set of data representing a current configuration of the data network nodes, and a second set of data representing a desired configuration of the data network nodes; generating, from said first set of data and said second set of data, an information entity representing a difference between said current configuration and said desired configuration, and reconfiguring at least one of said data network nodes using said information entity.