A Host-Based Multicast (HBM) Solution for Group Communications

摘要

In this paper we argue that overlay multicast is an important technology for applications requiring a group communication service. With this approach end-hosts (running the application), dedicated servers and/or border routers automatically self-organize into a distribution topology where data is disseminated. This topology can be composed of both unicast connections and native multicast islands (e.g. within each site). Therefore it offers a group communication service to all hosts, even those located in a site that does not have access to native multicast routing. One of the issues raised is the set up of an efficient and robust overlay topology. In this paper we discuss several possible solutions. We show in particular the benefits of having a centralized approach, of using redundant links and updating the topology based on a host stability criteria.