Issues with Routing in Software Defined Networks

Software Defined Network is a significant and emerging paradigm that separates its control plane from the data plane. The separation of planes makes it centralized, different from the traditional network and provide various advantages to the network. The centralized paradigm offers a key benefit of global network view at the controller, which can be efficiently utilized for routing in the network. Along with benefits, there are several issues specific to routing that researchers need to address before developing a new routing protocol. The traditional routing protocols cannot be directly implemented in this modern architecture; if implemented, they cannot take full advantages of the paradigm. This article provided various issues of concern specifically for routing in Software Defined Networks. The target is to introduce newbies the issues and make them aware of multiple research efforts made in this direction. The discussion provided in the article can be considered before developing routing solutions for such networks.