In a multi-service IP/MPLS network, it is a key challenge to provide Quality of Service (QoS) to end-users applications while effectively using network resources and providing reliable service. The goal of the research activity is to design a simulator that can efficiently model and analyze the behavior of MPLS networks, taking into account various network parameters and traffic patterns. The simulator will be used to evaluate the performance of different network configurations and to identify the most suitable design for a given set of requirements.