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Categories: SDN

Two decades ago, the core was the place to be in campus networking. The networking battles of the 1990s concluded with the edge specialists humbled and assimilated by core product lines. Control the core, we declared, and the edge will fall into place. But now the edge is fruitful, and the core is sterile—and for two reasons. First, the wireless interface adds mobility and complexity to the edge. Second, the new architectures of software-defined networking ( #SDN ) and IoT are based on centralized models that take sensed information, manipulate a software representation of the network, then send control signals back to network nodes. Nodes are peers under the controller. Their importance is based on the quantity and quality of the information they can report, as well as the sophistication of the control they can apply.

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