| Summary: | With the rise of VR/AR and 4K/8K video services, users have higher requirements for personal experience. Promotion of user experience is an important factor to attract end-users. Compared with traditional website access, the deployment of CDN has advantages of improving access speed, solving the problem of high traffic and large concurrency, improving the reliability of data sources. CDN’s basic characteristics can be summarized as: cache contents in different locations, and load requests of users to the most appropriate cache server through load balancing technology. The traditional networking mode deployed CDN on the core layer leads to contents away from the end users. This means the probability of occurrence of congestion increased, and the end-to-end delay enhanced. Therefore, CDN sink to the convergence layer and even edge layer can be considered to solve problems such as web browsing slow, video buffer in slow and so on. The sinking of CDN has a profound impact on the network structure, basic resources and network intellectualization. Large capacity PTN/OTN equipment should be deployed on each layer. The sinking of CDN leads to the flattening of the network. The basic resources of metro transport network such as computer room space, air conditioning, power supply must ensure the normal operation of the sinking CDN equipments and transmission equipments. SDN/NFV technology should be introduced to transmission network in the future.
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