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Software-Defined Networking (SDN) separates network control from forwarding by using centralized controllers and programmable interfaces. It enables dynamic control, automation, and improved visibility across large networks. SDN reduces hardware dependency and supports centralized policy and traffic management for data centers and cloud infrastructures.
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Software-defined networking separates a network’s logical control from packet forwarding and makes that control programmable.
SDN grew from the need to control networks more centrally and automatically. Open vSwitch is a software-based virtual switch implementation supporting SDN and automation scenarios.
A controller computes or distributes rules; switches forward packets according to those rules. Assess the control channel, failure modes, consistency, latency, and permissions. SDN simplifies policy and traffic management but does not remove network complexity or controller risk.
The control plane decides which network rules apply.
The data plane processes packets according to installed rules.
Interfaces and software enable automated, consistent rule changes.
SDN is a network architecture, distinct from general software design. It supports automation and segmentation but requires resilient controller, policy, and operations models.
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