Insights from the OT Trenches: Why SDN Beats VLANs on the Plant Floor

Published July 25, 2025

Software-defined networking (SDN) is transforming how industrial networks are secured and managed. Traditional segmentation methods—like zones and conduits defined in IEC/ISA 62443—often depend on VLANs, which can be complex and unreliable in OT environments.

This Insights from the OT Trenches installment explores how SDN simplifies network management through micro-segmentation, eliminates VLAN headaches, and prevents issues like network loops. For OT teams, it means fewer headaches—and more control.

 

Author: <a href="https://dynics.com/author/dynics-team/" target="_self">Dynics Team</a>

Author: Dynics Team

The Dynics engineering group designs and builds industrial computing hardware and OT cybersecurity systems for the plant floor. Its engineers hold more than 75 years of combined experience, and its plant-floor deployments go back more than 30 years. More than 75% of staff work in product development, design, assembly, and service. Dynics designs, fabricates, and assembles its panel PCs, monitors, rackmount chassis, and security appliances at a 37,500 square foot facility in Ann Arbor, Michigan.

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