The invention concerns a router associated to a secure device (DC) and included in a communication network (RC), comprising an interface (IRT) to communicate with the secure device following an authentication of the router by the secure device, and comprising a protocol interpreter (INT) to command the execution of the critical operations of one or more routing protocols by the secure device. The sensitive or critical portions of a routing protocol are executed in a secure and reliable manner in the secured device, for example of a chip card type.