Virtual and Software Defined Networks Virtualization means delivering on many of IT's promises - more automation, separating hardware from the software, increased agility, simplified design, policy-based management, network management bonded to broader IT workflow systems, etc.
Today, Software Defined Networking (SDN) is bringing in a lot of change in terms of processes and interaction, between humans, systems and one another. It has become the key enabler of software defined infrastructure which allows enterprises to create highly agile IT infrastructure. SDN is not only about technology transformation; it requires tighter integration and greater collaboration amongst servers, networks, and security teams that will have an impact on how enterprises plan, design, deploy and manage network. SDX Central predicts the potential SDN revenues growing from less than $15B in 2015 to nearly $105B by 2020 with CAGR of 47.5%. According to IDC, the worldwide SDN market for enterprise and cloud system provider segments will grow from $960 million in 2014 to over $8 billion by 2018, at a CAGR of 89.4%. According to Joe Skorupa, Vice President, and distinguished Analyst at Gartner, "Software defined networking is a new approach to designing, building and operating networks that supports business agility"
SDN is an innovative way of building and managing networks with most of the intelligence centralized in a piece of SDN controller. The SDN method centralizes control of the network by separating the control logic to off-device computer resources.It also has the potential to revolutionize legacy data center by providing a flexible way to control networking so it can function like the visualized versions of compute and storage today.
SDN also offers a centralized, programmable networking that can dynamically provision for the changing need of businesses. It aims to provide higher layer of abstractions with standardized interface to improve networking programmability resulting in flexibility, agility, and feature extensibility with lower OPEX. It also has the potential to lower CAPEX. Most of the SDN controllers offer full and complete integration with leading cloud management platforms. This provides the ability for cloud administrators and providers to bill and charge back customers based on usage and utilization of resources. For the customer, this means greater control and reduced cycle time for provisioning of infrastructure and bringing in ‘Pay as you Grow’ business models.
To date, SDN has been implemented in large or particularly network-centric enterprises. However, SDN is developing rapidly and is becoming more appropriate for a wider range of organizations all the time. There’s no particular magic in deciding if and when to adopt SDN; an enterprise doing so should look at risk-benefit analysis, security implications, change management, cultural and team skill issues. It’s advisable to use your solution providers’ experience with SDN planning and deployment to find out what’s worked - and what hasn’t - for others in your situation, and when it’s wiser to wait. Every revolution takes time to become the new normal, and networking is no different. While the advantages of SDN are undeniable and its future as the basis for enterprise networking assured, it’s still new and changing. When the time comes, and it will, be ready.