Quality of Services in Hybrid SDN (hSDN): A Review

As now a day we see that internet has become the backbone of each and every digital society, smart devices as well as the growth of new technology and concepts like IOT, Machine learning 4G, 5G and social network that totally chanced all network requirement. In the last decade Software Define Networking (SDN) changed the Computer Network to an important and significant model as it composed of three different layer Data layer, Control layer and Application layer, main Idea behind SDN is separation of Control layer and Data layer and centralization of control layer to improve efficiency and performance in the network. As Software Define N has lots of benefit compare to legacy network but still deployment of pure SDN is not an easy work and it has its own limitation and some major challenges like financial challenge, technical challenge, security Issue, downtime fear of the network and quality of service degradation. These challenges slow down deployment of fully SDN and cause the birth of Hybrid Software Define Network (hSDN) which legacy devices coexist with SDN devices and take advantage of both legacy and Software Define Network robustness and programmability. In this paper we explore a review of Quality of services in Hybrid SDN in an approach which Quality of Service can benefit the most from the concept of Hybrid Software Define Network.