I ran into an unexpected issue the other day that kept me scratching my head for a few minutes when a new ASA refused to take a code upgrade. Read on for the details.
Over the last couple of years, two major philosophies for SDN have evolved which I will call the overlay model, and the flow programmability model. Overlay networks are the notion of building multiple virtual networks in parallel on top of a physical network fabric, using some means of separating the virtual networks — typically an encapsulation method like VXLAN or NVGRE. Then we have the “flow programmability” model, based on the idea of programming SDN behaviors on a flow-by-flow basis into your existing (or new) physical and virtual network switches using a protocol like OpenFlow.
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Network Architect . CCIE 17846 . CCDE 2012::1
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