Modified Multi-Destination Restorations on ATM Multicast Tree

Abstract

Multimedia applications are forecast to benefit most multicast communication capabilities. The emerging high-bandwidth characteristic forces people to seek more high-speed technology than Internet Protocol (IP) multicasting. Recently, a connection-oriented nature of ATM network makes multicasting more powerful. In multimedia services, to support an ATM multicast tree (AMT) to connect all the conferencing members is a convenient and mordent method. The emergence of service and collaborative computing in distributed environments provides the AMT for system designers to include communication support incentive for the multimedia applications. In the high-speed nature in AMT, robust restoration becomes one of crucial and essential function since a network failure may cause a huge tangible and intangible loss for customers and service providers [17]. In this paper, based on survivability requirements, we investigate the restoration of an AMT. Two investigated dynamic restoration methods are developed to provide self-healing capability from a link or node failure：one is link-based and the other is tree-based restoration method. In the first mechanism, we apply a point-to-point restoration scheme on the AMT. In second, without changing the multicast services to the members, we allow reconfiguration of the AMT during the restoration phase. For each method, we also proposed two schemes to solve the AMT restoration problems：the three-phase Modified Multi-Destination Flooding (MMF) and the three-phase Tree-Type Flooding (TTF). By computer simulations, we verify the characteristics of the proposed schemes and the results show that the tree-based MMF and TTF outperform the link-based ones.