While learning about SDN, I often come across this kind of diagram where the switches have some kind of virtual connection to the controller. But how does that translate in real life? Isn't there a bootstrapping issue for fully software-defined networks?
Consider the following network:
controller <-> switch1 <-> switch2 <-> switch3 <-> host
How will switch3 be able to receive instruction from the controller? Does someone manually configure within switch3's CLI what's the IP of the controller? Is there authentication?
I guess another way to ask the question would be "What are the steps to set up from the ground up a full SDN network?".
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