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What Is 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 can’t just monitor the traffic but can even dictate the underlying systems similar to routers as well as other network gear, switches, how the network traffic must be handled and so forth. Because of this, it becomes easier for network engineers to respond to changing business needs and shape traffic flow without having to manipulate and hunt for individual switches.

As a matter of fact, SDN 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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Application Programming Interface or simply API indicates the set of tools and protocols used in building software applications. APIs are used to help express software when it comes to various components similar to output and inputs as well as operations. Thus, the northbound APIs in SDN communicate with all the apps on top while the southbound APIs are communicating with routers and eth switches below.
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The operational expense and capital is significantly reduced is the primary benefit of integrating SDN. Other benefits include automation and functional separation, optimization strategies, significant cost savings. Aside from that, higher reliability in network functions is necessary and even programmable switches and interfaces meaning, scaling down or up of network operation is pretty basic. This is due to the reason that the traffic loads are quickly adjusted, cost effective and dynamic. With this in mind, SDN seeks to serve a bridge between physical hardware part and intelligence part without causing any compromises either on its efficiency or functionality. The associated time and expense and even manual administration with reconfiguration are reduced dramatically.

At some point in time when loopholes exists in networking technology such as complexity, inability to scale down or up quickly and vendor dependence are leading cause to slow growth, software defined network appears to be the hope of all this. SDN is designed to be the answer to continuous progress with the dawn of a new era that is data driven, app intensive at every touch point and cloud centric.