Server Based QoS Routing

摘要

We propose centralized server based QoS routing schemes, where a route server is responsible for determining QoS paths on behalf of all the routers in a routing domain. In the proposed server based schemes, the dynamic link QoS state information, which is required for a QoS path computation, is implicitly maintained at the route server as it assigns or gets back QoS paths. By maintaining the network state information this way, we may not only eliminate the overhead to exchange network state update messages but also achieve higher routing performance. We discuss techniques for reducing the amount of processing overhead at the route server, and evaluate the performance of the proposed schemes using simulation. The simulation results show that the proposed server based QoS routing schemes may improve the routing performance compared to the distributed QoS routing schemes proposed in the literatures, and the proposed processing reduction methods may significantly reduce the processing cost at the route server.