Design And Implementation Of Topology-aware Based P2P Routing Model In Media Distribution System

Peer-to-Peer network technology is currently a hotspot in the international computer network technology research domain. The study of P2P routing network model is always an important component in the research of P2P technology. How to route efficiently in P2P network is the key to improve network scalability and resolve the network bandwidth consuming problem. Whether these problems can be solved will directly affect the efficiency of P2P applications and the further development of P2P technology.The work of this thesis is part of a project named "P2P Content Accessing Middleware System of Broadcast and Movie Medium based on IPv6", which is supported by the China next generation Internet (CNGI) Program of National Development and Reformation Committee. By analyzing the working mechanism and the existent questions of P2P routing models, this thesis proposes a new kind of P2P network routing model——Topology-Aware based Hybrid P2P network Routing Model (TAHRM), and applies it to the media distribute system. The primary work and contributions of this thesis include:1. Aiming at alleviating the topology mismatching between the P2P overlay network and the underlying physical network, this thesis analyses the topology-aware problem in current P2P network in detail, and summarizes the current research achievements of topology-aware P2P overlay network.2. A Proximate Longest Prefix Matching (Prox-LPM) based cluster partition algorithm is proposed in the new model. By introducing the method of cluster partition which combines IP address Longest Prefix Matching with network measure technology, TAHRM classifies the nodes which are physically closed into the same cluster, thus a topology-aware based P2P overlay network is built up. Taking advantage of nodes' network proximity character, TAHRM overcomes the detouring problem existing popularly in current P2P systems.3. An emChord distributed routing query scheme is proposed. On the basis of overlay network which is built up by cluster partition, this thesis organizes the nodes in the same cluster into the Local Hashing Ring which is embedded Global Hashing Ring, thus the routing query localization is carried out, avoiding the cross-territory routing several times.4. In the media distribution system with TAHRM as core, the related modules based on TAHRM are designed and implemented. Tests have verified that media distribution system offers better performance in the aspects of release delay, search delay, download speed, and so on.