If you know the basics of networking, there are two planes in a networking system, they are data plane and control plane. Data plane is basically the data input, output and connecting infrastructure (wired and wireless) hardware, where as the control plane (the brain) controls the movement of data. Today's widely used networking systems have both data plane and control plane integrated in single system, whose design is proprietary and is designed using custom ASIC chips.
The idea of Software Defined Networking (SDN) is to move the control plane out to a cloud or a server and make it more configurable, programmable using some of the open technologies. SDN uses less hardware more software.
SDN helps telecom networks to have highly flexible, optimised (in terms of bandwidth and usage) networks. It is predicted SDN to have a huge impact in the way networks are managed.
There are lot of Telecom software design service companies in India offering SDN development services. If you are interesting exploring opportunities in SDN, There is an event happening in Bangalore in this month covering latest trends in SDN technology. The event is named "Open SDN India Technology Symposium 2015" and a scheduled on January 18, 2015 to Monday, January 19, 2015 at Le Meridien, Bengaluru (Bangalore), India. The organisations promoting this event are ONF, IACC and CNLABS.
Program highlights include pre-event SDN workshop/tutorial on January 17-18, SDN solution showcase on Jan 18th evening, and a main event on Jan 19th with a key note from Dan Pitt, Executive Director, Open Networking Foundation (ONF).
The release from the event website "The value shift to software for a global market suits India’s strengths and talented resource pool quite well. It is our endeavor that this event will jumpstart an innovative SDN community in India serving customers worldwide. Please join this dynamic gathering of well-known SDN visionaries and leaders, Indian companies already in the SDN domain, multi-national SDN vendors with facilities in India, and more importantly network operators, IT Ops, software developers and the research community."
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If you are new to SDN learn basics of SDN at: