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Présentation : If you follow any number of news feeds or vendor accounts on Twitter, you've no doubt noticed the term software-defined networking or SDN popping up more and more lately. Depending on whom you believe, SDN is either the most important industry revolution since Ethernet or merely the latest marketing buzzword the truth, of course, probably falls somewhere in between . Few people from either camp, however, take the time to explain what SDN actually means. This is chiefly because the term is so new and different parties have been stretching it to encompass varying definitions which serve their own agendas. The phrase software-defined networking only became popular over roughly the past eighteen months or so. Google_trend_SDN.png So what the hell is it Before we can appreciate the concept of SDN, we must first examine how current networks function. Each of the many processes of a router or switch can be assigned to one of three conceptual planes of operation Forwarding Plane - Moves packets from input to output Control Plane - Determines how packets should be forwarded Management Plane - Methods of configuring the control plane CLI, SNMP, etc. For example, you might SSH into the CLI of a router the control plane and configure EIGRP to exchange routing information with neighbors the control plane , which gets installed into its local CEF table the forwarding plane . All of these operations occur within the same device, and each node in the network operates autonomously to make its own forwarding decisions based on its local configuration. It's critical to recognize that, although this allows for highly dynamic and automatic forwarding decisions through the use of robust protocols, the end result is ultimately dependent on each node's independent configuration. For the purposes of establishing context, we can think of this as administratively-defined networking. Continue reading
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