In this paper we introduce the SDNRoute system which aims to support routing decisions in Software Defined Networks. Such a system is especially important in the context of the SDN as this concept makes it possible to perform routing in a dynamic and elastic manner. We focus on the SDNRoute architecture and research challenges that must be investigated to develop the system. Additionally, we provide preliminary approaches to solve the issues including optimization problem formulation. Recent state of the art is presented regarding not only academia works but also industry deployments. It is especially important as SDNRoute system is being designed for the purpose of commercial application.