With technologies such as 5G, artificial intelligence (AI) and internet of things (IoT) gaining currency in the country, software-defined networking (SDN) and network function virtualisation (NFV) are reshaping the way networks function. Together, SDN and NFV are driving flexible, scalable, user-friendly and cost-effective networks with lower carbon footprints, which are required by small- and medium-sized businesses and enterprises. These technologies allow telecom operators and enterprises to segregate the functioning of networks from their physical infrastructure, thereby making them more efficient and agile. They also facilitate the delivery of personalised experiences to consumers.

A look at the market uptake, applications, use cases, challenges and outlook of these technologies…

Market uptake

According to industry estimates, the Indian SDN market, valued at $3.6 billion in 2024, is now projected to reach $8.9 billion by 2030, growing at a CAGR of 16.1 per cent during the forecast period.

The SDN architecture delinks the control plane (decision-making) from the data plane (traffic forwarding), allowing centralised control of the network through software applications. SDN directs network traffic and communicates with underlying hardware infrastructure, using application programming interfaces or software-based controllers. In addition to managing conventional hardware with software, it allows operators to design and operate virtual networks.

Software-defined wide area network (SD-WAN) is a well-known application of SDN. It is a virtual WANarchitecture that enables businesses to securely connect users to applications using a variety of transport services, including broadband internet, long-term evolution and multiprotocol label switching. SD-WAN employs a centralised control function to intelligently guide traffic, boosting application performance, improving user experience and lowering IT costs, in contrast to traditional WANs that backhaul all traffic to a central data centre.

Meanwhile, as per industry estimates, India’s NFV market is poised to grow in value to more than $1.62 billion during 2024-30. NFV is a transformative approach that enables the virtualisation of traditional network services, such as load balancers, firewalls and routers, which were previously dependent on specialised, proprietary hardware. By leveraging NFV, these services are transitioned into virtual machines (VMs) that operate on standard, commodity hardware. This shift allows service providers to replace expensive, dedicated network equipment with cost-effective, conventional servers.

NFV is a foundational component of the telco cloud, driving significant changes across the telecommunications sector. Its architecture is designed to deliver an agile, scalable and customisable network environ­ment. Using VMs and virtualisation technology, NFV simplifies network management by providing a unified, centralised view for configuration and control.

With NFV, network operators can seamlessly adapt to evolving traffic patterns and dynamic network requirements. This is achieved through automated provisioning and orchestration of network resources, all managed via a centralised control panel, ensuring rapid response to operational demands.

Technological applications and use cases

Several applications highlight how NFV and SDN are being utilised to tackle various challenges and provide enhanced business solutions.

Mobile edge computing

By using NFV, mobile edge computing (MEC) removes the need to backhaul all data to the network core by allowing network edge devices to deliver network fun­ctions and execute computational services using virtual machines. Ultra-low latency, a critical component of 5G networks, is enabled by this method. The establishment of small or local data centres at the network edge, which improve performance and efficiency, is a noteworthy trend. MEC is being used by enterprises across multiple sectors in the country, ranging from healthcare (processing patient data closer to the source, allowing for real-time monitoring and diagnostics) and manufacturing (facilitating real-time analytics and automation on the production floor) to retail (dynamic pricing, inventory management and targeted promotions, all processed locally to ensure swift customer interactions) and transportation (connected vehicle ecosystems for traffic management and safety).

Network slicing and migration

Since the commencement of 5G design and roll-outs, network slicing has become increasingly popular. With network slicing, a physical network – which includes both virtual and physical components – is div­ide­d into several logical levels, or slices, each of which is optimised for a particular purpose. With specialised resources and performance levels, each slice functions as a virtualised network function. Network slicing speeds up deployment and lowers capital and operating costs, while improving service creation and optimisation, as well as organisational agility and flexibility. Taking this concept a step further, network migration allows network segments from one physical location to another through SDN gateways. A case in point is Reliance Jio, which has migrated its 5G fixed wireless access traffic to a dedicated network slice. Besides telecom, industries where network slicing and migration are useful include logistics (for fleet management), media and entertainment (for enhanced live broadcasting) and infrastructure (smart cities for better governance and data centres).

Cloud-based applications

Cloud-based SDN and NFV solutions enable dynamic rerouting and rapid provisioning of network resources in response to disruptions. This flexibility ensures mini­mal downtime and maintains business continuity during disasters or network failures.

Leveraging microservices and containerisation for cloud-native applications is also becoming common. In the former, network functions are broken down into smaller, independent services that can be developed, deployed and scaled independently while in the latter, containers ensure consistent performance across different environments and allow for faster start-up times. For instance, banks use cloud-native network security functions (firewalls, IDS/IPS) to protect online transactions and ensure regu­latory compliance.

Obstacles to adoption

SDN and NFV are transforming network management and service delivery across industries. However, their adoption is not without challenges.

To begin with, SDN and NFV present unique security risks, primarily due to their centralised control mechanisms. The central control plane in SDN can become a single point of failure, making it a target for unauthorised access and data breaches. In NFV, the virtualisation of network functions can expose sensitive data to potential threats, while existing network vulnerabilities may manifest in new forms, such as memory leakage, interrupt/isolation failures, flooding attacks and routing security issues.

Moreover, integrating SDN and NFV with existing network infrastructure is a complex process. Organisations often encounter compatibility issues due to differences in protocols, architectures and operational models between traditional systems and software-driven networks. This transition demands careful planning, including hardware upgrades, software deployment and reconfiguration of network policies. The lack of standardised protocols further complicates seamless integration, leading to potential interoperability issues and vendor-specific dependencies.

While SDN and NFV offer the promise of enhanced network performance and agility, they can also introduce performance bottlenecks. Latency issues may impact real-­time applications, while network congestion and software processing overhead can degrade overall efficiency. In some cases, organisations have reported unpredictable latency and throughput instability, even with moderate network utilisation.

Fourthly, to maximise the benefits of SDN and NFV, organisations must ensure that their operations support systems and business support systems are aligned with the new network architectures. This alignment is essential for seamless service delivery and efficient management.

Lastly, despite the rapid evolution of SDN and NFV, the technologies are still maturing. A lack of consensus on standardisation, coupled with ongoing open-source initiatives and evolving business use case­s, poses significant obstacles. Addition­ally, the complexity of managing virtual networks beyond an enterprise’s phy­sical­ premises introduces new security and ­control challenges.

The bottom line

SDN and NFV are transforming network management and service delivery across industries. For instance, they offer benefits such as cost savings, enhancing customer experiences and supporting the development of next-generation technologies such as 5G, IoT and AI. Therefore, network operators and enterprises alike should invest in these technologies and upskill their workforce to use them. That said, while SDN and NFV offer substantial advantages, their adoption must be approached with careful planning, robust security measures, effective training programmes and a focus on vendor management and standardisation. Only then can organisations unlock the full potential of these transformative technologies.