关键词: 区分服务, 组播, DSMCast, 聚集组播

Abstract:

Proposed in this paper is an encapsulation-and-aggregation-based DiffServ multicast scheme named EADSMCast （ Encapsulated and Aggregated DiffServ Multicast） . Derived from the encapsulation-based DSMCast, EADSMCast encapsulates the forwarding information of all core routers of the aggregated tree into each multicast packet head,thus ensuring the statelessness and scalability of core routers in the service domain. Moreover,by improving the group-tree matching algorithm,several multicast groups with similar forwarding structure may share the same aggregated tree,thus reducing the size of multicast routing table maintained by edge routers. Simulated results indicate that EADSMCast is a scalable scheme for supporting heterogeneous QoS multicast.

Key words: DiffServ, multicast, DSMCast, aggregated multicast