The Research And Realization Of Huge CDN Network

CDN technology appeared in order to alleviate the big pressure to Internet brought by the mass alike internet services which have been mounting on the broad-band services in recent years. Many service providers, including China Telecom, are planning to construct the CDN network base on their own resource, not only saving the network resources but also giving a high quality of service at the same time. Nowadays, China Telecom is designing a new CDN network base on the old one, and the new streaming media network will expand to nationwide.This dissertation will commence from the streaming media technology, specially introduce the CDN technology and its development in China and foreign country, and describe the connection between CDN and traditional network. Basing on the current CDN network structure, this paper proposes the problems of the CDN network in China telecom and gives the solutions. Firstly, the connection between CDN backbone and province network is analyzed, and a new coordinate structure is proposed, secondly, considering the feature of huge network, three national centers are designed for management, depends on the different types, the traffic is separated for the storage and sharing in the three centers. In the paper writer also discusses the local-balance technology, analyzes and compares the difference between the two kinds of GSLB technology, one is based on DNS, another is based on location in the application layer, introduces the GRM (Global Routing Management) to help the GSLB that realize the tactics route control. Basing on the above, the writer describes the main service procedures in a huge CDN network at the end of the paper, make sure all kinds of process can operate in content pouring, content delivery, customer's service and so on.This paper provides the existing operator a constructive solution for its CDN network transformation and optimization. It has practice implication and applied value for the network performance improvement for China telecom CDN frame network. The research output of this paper also applies to other CDN networks of the telecom sector. It provides the references for the CDN network optimization.