Effectiveness and issues of rerouting algorithms for QoS networks

In QoS networks, routing algorithms for QoS traffic have to provide the tra nsmission path satisfying its QoS requirement. while achieving high utiliza tion of network resources. Therefore, server-based QoS routine, algorithms would be more effective than distributed routing ones which are very common on the Internet. Furthermore, we believe that rerouting function enhances the advantage of their algorithms in which an already accepted flow with es tablished path is replaced on some other path in order to accept newly arri ving transmission request if it can not be accepted without doing so. Thus in this paper, we will propose a rerouting algorithm with the server-based QoS routing and evaluate its performance in tet ms of the blocking probabil ity by computer simulation. In addition, we will investigate the impact, of the amount of traffic with high-priority on the performance in some networ k topologies. Through some simulation results, we also discuss some issues arising in improving the effectiveness of rerouting.