SDN Controllers Comparison
This paper presents about Software Defined Network (SDN) which is a new networking paradigm where the
architecture moves from the traditional fully distributed model to a more centralized approach. Software Defined
Networking (SDN) is a new networking arch type and is also the most discussed topic of networking technology of recent
years as it brings a lot of new capabilities and allows to solve many hard problems of legacy networks. This approach is also
characterized by the separation of the data and control planes. The SDN proposed an approach which involves in moving
network's intelligence out from the packet switching devices and putting it into a centralized logical controller. Controllers
act as the control point for networks to manage flow between the Application layer and the Data layer through the
Southbound API's and the Northbound API's to create a more flexible network. The forwarding decisions are primarily done
in the controller and then moves down to the switches where it directly executes the logical decisions. Advantages like
global controlling and viewing the whole network at a time are being provided, which is helpful for automating several tasks
like Operation of a network, better server and network utilization, etc.
Index terms - SDN Controller; Software Defined Network.