中国电信的ChinaNet是全球最大的Internet之一,承载着全球最大的流量,并且长期呈高速增长,今后也将继续保持高增长态势.超大流量的Internet可持续发展和网络每比特承载成本的降低,是两个关键的问题.从这两个方面出发,利用集中控制的技术优势,探索如何将ChinaNet逐步迁移到SDN,并利用集中控制技术解决ChinaNet面临的问题.%China Telecom's ChinaNet is one of the largest networks in the world,carrying the world's largest traffic.The network's traffic has increased dramatically for several years by about 50％ per year,and will continually increase in the future.How to deal with the sustainable development of the network and cut down expansion cost are key issues.Gradual evolution of ChinaNet to SDN was focused on.Thanks to centralized control technology,some of the issues faced by ChinaNet would be solved at the same time.
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