Software-defined networks are a new paradigm in the world of computing which significantly changes the way in which we deploy and manage our networks and devices. The basic two features of SDN are the separation of control and data planes and the establishment of a central control site in the form of SDN controller. The controller as a central place in the network provides an interface to network applications that can be used for different purposes such as traffic management, network security management, network optimization, etc. This paper presents the functionality of a SDN application written by the author of this thesis for the purpose of traffic management within the SDN topology. After testing and running the application we marked the difference in convergence time between SDN and traditional networks that use STP and RSTP protocols, we observed better time of network availability and lower latency in SDN network, we also demonstrated how granular access to traffic management in the SDN network can be achieved. During a demonstration of SDN and traditional network implementation we demonstrated significant advantages in times that are needed to obtain an information about the current state of network topology.