| 摘要 |
A multicast data distribution system (10) providing a guaranteed quality of service for distributing information over an IP network is disclosed. The novel data distribution system supports multicast delivery of information from centralized content servers (12) to multiple subscribers (18) connected to ISPs (16). To receive multicast data, a subscriber must be part of a multicast group. The system includes one or more POP (14) relay sites each of which has an independent connection to the content servers (12). The POP relays, in turn, are connected to one or more ISPs. The ISPs include router/terminal servers (24) capable of supporting multicast over PPP connection. The POP relays function to forward multicast datagrams over sent by the content servers to the ISPs connected to them. The ISPs then forward the multicast datagrams to each of the subscribers that are members of the multicast group.
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