Majority of SDN manufacturers claim that they have been quick enough long since. However, customers need a more significant change. They need to get rid of their dependency on specific products, and to separate physical devices from their services. Network functions are transferred to the control layer – the controller; the function of user devices is limited to rule-based (instruction-based) frame delivery. A special term has been established for such customer devices: "White switch", a switch with standard OpenFlow software. It is clear that such an SDN solution explicitly eliminates dependency on hardware manufacturers, speeding up selection and deployment of new network elements significantly.
Cutting data network operating costs is not the only benefit of SDN. The network is made available to new applications via its defined open interface above the control layer. Where we have been pegged down by collaboration abilities of individual network elements, now we have SDN with its ability to solve everything by means of its central "brain" – the controller. It opens up a new path to previously unthinkable applications, or applications economically unjustifiable. At the same time, it opens up a new economic model with applications over SDN.