The aim of the present invention is a method to achieve the customization of the communication network of a multicore communication system. This goal is achieved thanks to a method to design a multicore communication system, said communication system comprising a communication network having a plurality of switches and several elements communicating through the communication network, said method comprising the steps of: a) defining the communication network topology, comprising a number of switches, the architecture of said switches and the interconnection between said switches, b) defining routes to communicate among the elements through the switches according to the application running on the system, c) marking the input-to-output connections used within the switches traversed by these routes, d) removing all or part of the electronic components related to the non-marked connections.