NNT: An effective strategy of node selection for ALM forwarding trees

Application layer multicast (ALM) has resolved the issue of deployment, but effectiveness inferiors to IP multicast. In this paper, the research is focused upon the influence on the communication efficiency of the multicast tree using three kinds of node selection strategy, which are based on min-delay, max-bandwidth, and nearest network topology. This paper presents NNT, a distributed spanning tree algorithm using the nearest network topology node selection strategy. The average delay and average joining time of the tree are analyzed. Simulation experiments show that this strategy takes more physical network circumstances into consideration, so it has high data communication efficiency.