The performance of Peer-to-Peer (P2P) content multicast systems usually degrades dramatically because of peer's selfish behaviors such as free-riding. To solve this problem, the paper suggests that each peer monitors its neighbors' bandwidth and manages connections with them according to the results of monitoring, so as to distribute efficiently the massive content to all peers in selfish environments. The proposed protocol is explained in details and performance analyzing and simulating show that the protocol incurs a moderate and constant network load on peers and distribution server in the system.%P2P内容多播系统常常因受到搭便车等自私节点行为的影响而导致性能急剧下降,为此本文采用邻居节点进行带宽监测,并根据监测结果管理彼此间的邻接关系,实现在自私环境下大规模内容的有效多播分发.对所提出的算法协议进行较详细的描述,性能分析与仿真表明该协议所导致的系统中用户节点与分发服务器的网络负载适中且较稳定.
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