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All About Software Defined Networking

Software Defined Networking or simply as SDN is basically a revolutionary concept that seeks in optimizing the function of the network and drastically improve its performance. There’s a central control layer in every SDN that is designed to regulate the flow of info as well as the associated usage of bandwidth and several other parameters. With this being said, we can say that SDN controller offers administrators the bird’s eye view of the whole network it and functions as a virtual brain.

They couldn’t just monitor traffic but can also dictate the underlying systems like routers as well as other network gear, switches, how the network traffic must be handled and so forth. For this reason, network engineers can easily respond to the changing business needs and be able to shape traffic flow without manipulating and hunting for individual switches.

Basically, SDN controller is the central brain and functions as intermediary between two levels. The applicator layer is the level above controller and all data that travels to that level is northbound while infrastructure is the level below it which all data travelling in this direction is southbound.
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API or Application Programming Interface refers to the set of tools and protocols that are used in building software applications. APIs help in expressing software in regards to its various components similar to output and inputs as well as operations. Knowing about this in SDN, the southbound APIs are communicating with routers and eth switches below while northbound APIs communicate with all apps on top.
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The primary benefit of incorporating SDN is that, the operational expense and capital is significantly reduced. Other benefits include automation and functional separation, optimization strategies, significant cost savings. Apart from that, higher reliability in networking functioning is obtained and programmable switches and interfaces meaning, scaling down or up of network operation becomes basic. This is due to the reason that the traffic loads are quickly adjusted, cost effective and dynamic. Because of that, SDN seeks to be a real bridge between physical hardware part and intelligence part without any compromises on efficiency or functionality. The time and the expense as well as manual administration associated with reconfiguration are reduced dramatically.

At some point in time in which loopholes still exist in networking technology like complexity, inability to scale down or up quickly and vendor dependence are the leading cause to the slow growth, software defined network appears to be the hope of all this. With the dawn of a new era that’s data driven, app intensive at every touch point and cloud centric, SDN is set to be the answer to having continuous progress.