2337: Intra-LIS IP multicast among routers over ATM using Sparse Mode

This document describes how intra-LIS IP multicast can be efficiently supported among routers over ATM without using the Multicast Address Resolution Server (MARS). The method described here is specific to Sparse Mode PIM [PIM-SM], and relies on the explicit join mechanism inherent in PIM-SM to notify routers when they should create group specific point-to-multipoint VCs.