On the basis of analyzing the real use cases of network traffic optimization
an idea and system architecture were presented
which abstracted the current network to the overlay network and used the SDN controller to control the overlay network for smart traffic steering and optimization according the policies defined by users. This solution can be widely applied in multiple different type of IP networks
and utilize the mature protocols to migrate the existed network to SDN smoothly with the benefits from SDN.
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references
McKeown N , Anderson T , Balakrishnan H , et al . OpenFlow:enabling innovation in campus networks . ACM Communiations Review , 2008 ( 4 )