RFC 2337 (rfc2337) - Page 1 of 8

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

Network Working Group                                       D. Farinacci
Request for Comments: 2337                                 Cisco Systems
Category: Experimental                                          D. Meyer
                                                           Cisco Systems
                                                              Y. Rekhter
                                                           Cisco Systems
                                                              April 1998


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

Status of this Memo

   This memo defines an Experimental Protocol for the Internet
   community.  It does not specify an Internet standard of any kind.
   Discussion and suggestions for improvement are requested.
   Distribution of this memo is unlimited.

Copyright Notice

   Copyright (C) The Internet Society (1998).  All Rights Reserved.

2. Abstract

   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.

3. Overall model

   This document focuses on forwarding of multicast traffic among PIM-SM
   routers connected to an ATM network. Routers on an ATM network are
   partitioned into Logical IP Subnets, or LISs.  This document deals
   with handling multicast within a single LIS. Handling inter-LIS
   multicast traffic, including handling shortcuts, is outside the scope
   of this document.  In addition, this document does not address
   forwarding of multicast traffic to or from hosts connected to an ATM
   network.










Farinacci, et. al.            Experimental