Research of content distribution network based on active network

In order to deploy replica servers in CDN (content distribution network) dynamically, a novel active network based content distribution network (ACDN) was proposed, in which the active nodes are deployed between client nodes and Web servers and it provides active nodes with dynamic programmable ability by using plug-in technique so as to make network dynamically and rapidly deploy replica servers according to Web servers, network operation conditions or rules defined by users. Combining with the single parent mutation and crossover operator of genetic algorithm, a replica server placement optimization algorithm was provided. In addition, the interest measure is determined by the request frequency to maintain the content consistency between replica and web servers. Simulation results show that ACDN architecture can satisfy the requirement for time response in Web applications; and the three algorithms designed for ACDN can not only meet the performance requirements for the content distribution, but also be applied to traditional CDN.