Great SDN / OpenFlow follow up article.
Greg Ferro writes exceptionally well, is technologically knowledgeable, provides incisive commentary, and invariably makes cogent arguments over at EtherealMind. Having met him, I can also report that he’s a great guy. So, it is with some surprise that I find myself responding critically to his latest blog post on OpenFlow and SDN.
Let’s start with that particular conjunction of terms. Despite occasional suggestions to the contrary, SDN and OpenFlow are not inseparable or interchangeable. OpenFlow is a protocol, a mechanism that allows a server, known in SDN parlance as a controller, to interact with and program flow tables (for packet forwarding) on switches. It facilitates the separation of the control plane from the data plane in some SDN networks.
But OpenFlow is not SDN, which can be achieved with or without OpenFlow. In fact, Nicira Networks recently announced two SDN customer deployments of its Network Virtualization Platform (NVP)…
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