The rapid growth of P2P traffic, to the autonomous network (such as the campus network, campus network) a great deal of traffic the network perimeter pressure. P2P traffic on the network to reduce the impact of critical applications, we must establish a local P2P traffic optimization mechanism, so that P2P traffic within the network as much as possible in self-government to ease the pressure on the network exit bandwidth. self-government began to use the network perimeter network of P2P traffic identification based on DPI technology, the identification of P2P traffic to be limited. However, this method simply restrict P2P applications, it will seriously affect the user experience for streaming media on demand. This paper presents a P2P caching network boundaries and local node index mechanism with the P2P traffic to local optimization strategy.