Iv. relationship and definition of Sdn/openflow

SDN (Software Defined Networking) SDN is not equal to OpenFlow, its relationship is similar to the Internet is not equal to IP protocol, PSTN is not equal to 7th signaling, IMS does not equal to the sip,web system is not equal to the HTTP protocol. OpenFlow is only the SDN controller control forwarding Surface Equipment protocol, the controller's own architecture, network topology algorithm, operating environment, programming tools, as well as the application of high-level integration technology are part of the SDN, and is a more central part of the architecture.
OpenFlow a network protocol that has four features:
First, the equipment has the characteristics of commercial performance and low price; second, the equipment must be able to support a wide range of research areas; third, the equipment must be able to isolate the experimental flow and operating flow; four, the equipment must meet the requirements of the equipment manufacturer's closed platform.
OpenFlow Network by OpenFlow Switch, I only know this before, now I know there are also flowvisor and controller three components. The OpenFlow switch carries on the data layer forwarding, the Flowvisor network carries on the virtualization, controller to the network centralized control, realizes the control close function.

On the essence of SDN http://blog.sina.com.cn/s/blog_5385c0b901010pu3.html
Deep analysis of OpenFlow technology http://blog.sina.com.cn/s/blog_5385c0b901010ptx.html
Google uses Sdn/openflow to make WAN link utilization reach 100% http://www.cnw.com.cn/news-international/htm2012/20120612_248481_2.shtml