Y. Gong, T. Kato, and S. Itoh (Japan)
IP Multicast, IGMP, Multicast Routing Protocol, PIM-SM
Recently, some ISPs have started to provide IP multicast information delivery services. In the IP multicast mechanism, IGMP is used between end hosts and last hop routers and multicast routing protocols are used between multicast routers in backbone networks. Currently, it is common that a customer premises contains a single host or a LAN with a single segment, and therefore, most ISPs use IGMP as the interface between the customer premises and themselves. However, more advanced customers may introduce LAN with multiple segments and perform their own multicast delivery within LAN. For those customers, it is impossible to use IGMP at the ISP and customer boundary. On the other hand, from the standpoint of ISPs, it is inconvenient to introduce different kinds of protocols, IGMP and multiple kinds of multicast routing protocols. In this paper, we propose a scheme to accommodate multicast capable LANs with PIM-SM into ISP based on IGMP.
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