2..The Road to SDN

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翻译

Making computer networks more programmable enables innovation in network management and lowers the barrier to deploying new services. In this section, we review early work on programmable networks. We divide the history into three stages, as shown in Figure 1. Each stage has its own contributions to the history: (1) active networks (from the mid-1990s to the early 2000s), which introduced programmable functions in the network to enable greater to innovation; (2) control and data plane separation (from around 2001 to 2007), which developed open interfaces between the control and data planes; and (3) the OpenFlow API and network operating systems(from 2007 to around 2010), which represented the first instance of widespread adoption of an open interface and developed ways to make control-data plane separation scalable and practicalMaking c