Research On Cache Policy Of Named Data Network

Named Data Network is a data centered network. It is designed for solve the problem of mismatch point between network application layer and network layer in IP network. Current network layer focus on content itself, but network layer need concern the location of content. NDN solve this mismatch and make them all focus on content itself. It also avoids current application need a middleware to solve this problem and enhance the efficiency of network configuration and performance.In NDN, it is an important feature that using in-network cache to enhance the network performance. Every node can cache the packets.When it has a same data request, it can directly return from the node cache. NDN use LCE as its default cache policy, every node will cache the past packets. When the cache space is full, the newest packet will replace the not recent hit packet. LCE cache policy makes a lot of duplication of data and decreases the whole network ability of caching data, and then influence the network system performance.The paper proposes a NDN cache policy. It tries to solve the LCE cache duplication and increase the hit rate at core route node. It changes the dependence of cache policy and design a cache policy based on packet hop count. The policy combines LCE policy and path co-ordination policy's advantages. In core route node, it uses path co-ordination policy to reduce the duplication. In side route node, it uses LCE to enhance network delivery network and make NDN not also reduce the duplication but also enhance the hit rate at core route node and optimize the NDN cache.The paper also run the cache policy in NFD, and uses ndnSIM to simulator the network performance and deploy in VMware ESXi. The result shows that cache policy can enhance hit rate of core route node and decrease the duplication. It also can use in real NDN environment.It provides a further support for NDN research and deploy.