Scalable approaches for DiffServ multicasting

Abstract

Over the last several years, there has been an explosion in the introduction of new Internet technologies. Whereas the Internet in its original form was a medium primarily for academia and research interests, the Internet has been redefined as business and consumer interests have dominated the focal points of Internet technology. The dominant question facing the Internet today is, how can the network meet the needs of the users and their applications while trying to keep such implementations scalable to the billions of users present on the Internet? Two of the emerging technologies for answering the question are Differentiated Services (DiffServ) and multicasting. Although the two technologies share complementary goals, the integration of the two technologies is a non-trivial issue due to three fundamental conflicts. The three fundamental conflicts are the scalability of per-group state information, sender versus receiverdriven QoS, and resource management. The issues surrounding how to solve these conflicts provide the basis for this dissertation. In this dissertation, two architectures (DiffServ Multicasting (DSMCast) and Edge-Based Multicasting (EBM)) are proposed to satisfy the requirements for scalable DiffServ multicasting architectures. In addition to the two architectures, this dissertation also presents the first indepth study regarding single tree support for heterogeneous QoS multicasting. Furthermore, the dissertation proposes a novel application of DSMCast for fault tolerance and management of the DiffServ network. Finally, the dissertation comments on future applications of the architectures and proposes several areas for future research.

DSMCast: a scalable approach for DiffServ multicasting

“…If present, the QoS transformation code denotes how to change the DSCP (and hence the PHB). A complete example of the TEH is given in [18].…”

“…Although not shown, NSFNet was also used as a realistic topology for comparison in [18]. • Each edge router was the source for two SSM multicast groups (32 total groups).…”

“…The order of the interfaces is sorted by the unique ID of the neighbor on other side of the link corresponding with the interface. The maximum number of interfaces is denoted by the Extended Replication bit of the options field (5 or 6 interfaces, 12 or more with use of the Extended ID bit) [18].…”

Heterogeneous quality of service in DiffServ networks - static and dynamic multicast

“…The scalability problems of multicasting run counter to the fundamental principle of scalability that DiffServ was designed to address in the first place. The primary conflicts between DiffServ and multicasting are summarized below [6]:…”