One of the attendees of the ProgrammableFlow webinar sent me an interesting observation:
Though there is separate control plane and separate data plane, it appears that there is crossover from one to the other. Consider the scenario when flow tables are not programmed and so the packets will be punted by the ingress switch to PFC. The PFC will then forward these packets to the egress switch so that the initial packets are not dropped. So in some sense: we are seeing packet traversing the boundaries of typical data-plane and control-plane and vice-versa.
He’s absolutely right, and if the above description reminds you of fast and process switching you’re spot on. There really is nothing new under the sun.
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