Abstract: A network optimisation system including a neural network module (200) for receiving traffic data representing traffic for a communications network and generating path configuration data representing paths between origin and destination nodes of the network for the traffic, and an analysis module (210) for processing the path configuration data and the traffic data and generating optimal path configuration data for the traffic. The analysis module may use a marginal increase heuristic (MIH) process, and a neural network may be trained on the basis of path configuration data generated from traffic data processed using a mixed integer linear programming (MILP) process.