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Software-Defined Networking (SDN) Definition - Cisco

Adopt an SDN solution that provides automation and programmability across your entire network. See how SDN is the foundation for automating the complete network lifecycle with intent-based networking.

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SDN is an architecture designed to make a network more flexible and easier to manage. SDN centralizes management by abstracting the control plane from the data forwarding function in the discrete networking devices.

An SDN architecture delivers a centralized, programmable network and consists of the following:

• A controller, the core element of an SDN architecture, that enables centralized management and control, automation, and policy enforcement across physical and virtual network environments
• Southbound APIs that relay information between the controller and the individual network devices (such as switches, access points, routers, and firewalls)
• Northbound APIs that relay information between the controller and the applications and policy engines, to which an SDN looks like a single logical network device

SDN has seen wide adoption across data centers (64%), WANs (58%), and access networks (40%). For more information on SDN trends, see the 2020 Global Networking Trends report.

SDN serves as a foundational element of a comprehensive intent-based networking (IBN) architecture. SDN has been limited to automated provisioning and configuration. IBN now adds "translation" and "assurance" so you can automate the complete network lifecycle and continuously align the network to business needs. Watch our Beyond SDN webinar recording to explore more ways that intent is changing how we network.

Build programmable networks that auto-discover and auto-configure fabrics and switches.

Improve the health of networks with network analytics, machine learning and predictive insights.

Deploy consistent zero-trust access across your network with policy-based segmentation

Lay the platform to automate life-cycle management across access, WAN and cloud network domains

After the Cisco SD-Access deployment, Kolmar's campus has become an amazing IT innovation place with seamless L2 roaming, comprehensive policy, and full IP mobility. With Cisco DNA Assurance, we save time, cost, and deliver powerful insights to the field—all with a lean IT team.

- Howon Lee, IT Senior Manager, Kolmar Korea

Cisco ACI is very flexible and our virtual learning environment was already on the network, so we didn't have a problem with the increased load. It took us one or two days to get everyone working from home and carrying on like normal.

- Richard Lock, Principal Infrastructure Engineer, University of Derby

Due to the rapid digitization efforts of city departments, we are called upon to solve a diverse set of connectivity problems and are challenged to provide our services faster. With Cisco SD-Access, we can automate and apply segmentation and security policies to our network devices up to 10 times faster than before. Cisco DNA is the right platform for our city to remain on the forefront of technology for years to come.

- Frank Weiler, Head of Networking Department, City of Luxembourg

Deploy faster with a strategic plan, migration strategy, and roadmap. Drive operational excellence with services to help improve security and visibility.

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