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The SEL-5056 Software-Defined Network Flow Controller is software designed to optimize software-defined networking (SDN) configuration and management for critical infrastructure. The SEL-5056 Flow Controller is designed to work collectively with the SEL SDN switches to provide a complete traffic-engineering solution for Ethernet-based LANs. Traffic engineering with the SEL-5056 Flow Controller enables flexible configuration of each communications flow path and the ability to proactively engineer fault-tolerant networks, resulting in greater performance, improved reliability, and more deterministic packet delivery.