The Numerous Levels of SDN Reality

A newbie exploring the mythical lands of SDN might decide to start at the ONF definition of SDN, which currently (November 2015) starts with a battle cry:

The physical separation of the network control plane from the forwarding plane, and where a control plane controls several devices.

The rest of that same page is what I’d call the marketing definition of SDN: directly programmable, agile, centrally managed, programmatically configured, open standards based and vendor-neutral.

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