Hierarchical PathQoS on a QoS- based Multicast Protocol SRSVP

In this paper, we argue a method to collect information of each existing multicast flow on hierarchical networks. SRSVP, a QoS-based multicast routing protocol, is designed as it collects flow-specific information, called PQ, by putting it into signaling messages, so that the derived QoS path becomes more efficient. HQLIP, an underlying QoS-based unicast routing protocol, handles a network as a hierarchical structure for scalable QoS-based routing. We have designed and implemented an algorithm to compute PQ (hierarchical PQ) corresponding to aggregated link information on hierarchical networks for SRSVP to compute better QoS paths. We have attempted to make the algorithm more efficient by examining behaviors of routers.