SDN or Software Defined Networking is actually a revolutionary concept that seeks to optimize the network’s function and improve its efficiency further. 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. In relation to this, SDN controller serves as a virtual brain of a network and offering administrators the bird’s eye view of the entire network it covers.
They aren’t just capable of monitoring traffic but is also capable of dictating the underlying systems such as 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.
SDN controller is basically the central brain and functions as intermediary between two levels. Applicator layer is the level above the controller and all data that’s travelling 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 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. 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 operational expense and capital is significantly reduced is the primary benefit of integrating SDN. Automation and functional separation, optimization strategies, significant cost savings can be achieved as well. 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. 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 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. 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.