SDN or Software Defined Networking is a revolutionary concept that is seeking to optimize the function of a network and improve its efficiency drastically. 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. 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. 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.
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 means the set of tools and protocols 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 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. This is due to the reason that the 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 expense as well as manual administration that’s associated with the 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 set to be the answer to continuous progress with the dawn of new era that’s data driven, app intensive at every touch point and cloud centric.