Cache Algorithm Based on Related Content Attracting in Content Delivery Network

【Abstract】 The existing content cache algorithm of Content Delivery Network(CDN) leads to the expansion of routing table with the network increasing,which will impair the routing efficiency and network performance. Therefore,based on related contents attracting,a related contents attracting algorithm is proposed. With the effect of attracting similar contents cached in other near nodes,for the purpose of apparently stable featured contents of nodes cached,the algorithm attracts major characteristic contents,rejects secondary feature contents,and enlarges the difference of different characteristic content. It also gathers the related contents on the same nodes via the mutual attraction with same contents feature,which facilitates the cache contents feature abstraction. Meanwhile,the strategy of lifetime increasement between contents with main feature is designed to deduce the routing advertisement and improve the routing scalability. Experimental results show that the proposed algorithm can reduce the update frequency of cache content,and improve the routing reliability. 【Key words】 Content Delivery Network(CDN);cache algorithm;contents attracting;cache factor;cache redundancy; routing