Is the SDN replacement of vendor specific (cisco, juniper) switches and routers ?

Question

If my thought is correct then how these big companies are going to handle these cases ?
How much an operator/user can trust on these open source software solution ?

Answer 1

The big vendor companies still fighting for the SDN controller solution. We may say the SDN can replace the vendor dependency, but in fact it almost cannot realized since the vendor must has their own signature.

It also create the opportunities for the other start up company to bring their solution in SDN, so it will make more choices for the user.