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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. In SDN, there is basically a central control layer that is meant to regulate the flow of info as well as the associated usage of bandwidth and several other parameters. For this, SDN controller serve as a virtual brain of a network and offering administrators the bird’s eye view of the entire network it covers. 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. 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. As a matter of fact, SDN 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 means the set of tools and protocols 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. For this reason, in SDN, the northbound APIs are communicating with all apps on top while southbound APIs are communicating with routers and eth switches below.
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Among the many benefits of implementing SDN is the fact that it significantly reduce operational expense and capital. As a matter of fact, you can also attain automation and functional separation, optimization strategies, significant cost savings. Moreover, higher reliability in the network function is acquired and even programmable switches and interfaces meaning, scaling down or up of network operation is simple. The reason behind this is that, traffic loads are 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.