应用层组播的鲁棒性技术分析

Analysis of the robustness in application layer multicast

针对应用层组播生成树的某些节点失效后其下游节点无法接收到分组的问题,提出一种新的预先式树重构方法.该方法利用树中节点的空闲度和主动随机转发技术,以一定的概率创建冗余链路,从而增加备份路由.仿真结果表明,该策略可以减少不能接收到组播分组的节点数量,明显提高应用层组播的鲁棒性.

When some nodes failed in the application layer multicast（ALM） , the downstream nodes can not receive packets. Aming at this problem, a new proactive approach to reconstruct ALM tree was proposed. Router backup was increased by using residual degrees of nodes associated with proactively randomized forwarding technology which creates virtual links by a certain probability. Simulation results show that the strategy can reduce the number of nodes that cannot receive group packets and significantly improve the robustness of ALM.