Design and evaluation of inter-bandwidth broker signaling

Bandwidth brokers (BBs) have been proposed for providing end-to-end quality of services (QoS) in differentiated services (Diffserv) networks. As a single entity in each domain, a BB aims at performing both intra- and inter-domain resource management on behalf of its domain. There have been plenty of BB studies for intra-domain resource management. However, how a BB can perform inter-domain resource management in a scalable and deployable manner is still an open issue. In this work, we present the design, implementation and evaluation of an inter-BB communication protocol that is used by each BB to communicate with its neighboring BBs for inter-domain QoS resource management. The proposed model uses a destination-based aggregation scheme in which reservations are aggregated as they merge through the destination region. The destination-based aggregation improves inter-domain state and signaling scalability. The protocol also performs traffic engineering to increase inter-domain resource utilization. The implementation and simulation results verify the achievements of our model.