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. In SDN, there’s a central control layer seeking 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. As a result, network engineers can respond easily to individual changing needs and 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 infrastructure is the level below which all data travelling in this direction is southbound while the applicator layer is the level above the controller and all data travelling to this level is northbound.
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API or Application Programming Interface refers to the set of tools and protocols that are used in building software applications. In expressing software about various components similar to output and inputs as well as operations, APIs are what used. 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 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. 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 because of the reason that traffic loads can be quickly adjusted, cost effective and dynamic. Thus, SDN is seeking to be a real bridge between the physical hardware part and intelligence part without 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 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.