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A Revised Internet-Draft is available from the on-line Internet-Drafts 
directories. This draft is a work item of the IP Over Asynchronous Transfer
Mode Working Group of the IETF.                                            

       Title     : Support for Multicast over UNI 3.1 based ATM Networks.  
       Author(s) : G. Armitage
       Filename  : draft-ietf-ipatm-ipmc-08.txt
       Pages     : 78
       Date      : 10/25/1995

Mapping the connectionless IP multicast service over the connection 
oriented ATM services provided by UNI 3.0/3.1 is a non-trivial task. This 
memo describes a mechanism to support the multicast needs of Layer 3 
protocols in general, and describes its application to IP multicasting 
in particular.         

ATM based IP hosts and routers use a Multicast Address Resolution 
Server (MARS) to support RFC 1112 style Level 2 IP multicast over 
the ATM Forum's UNI 3.0/3.1 point to multipoint connection service.  
Clusters of endpoints share a MARS and use it to track and disseminate 
information identifying the nodes listed as receivers for given multicast 
groups. This allows endpoints to establish and manage point to multipoint 
VCs when transmitting to the group.          
                              
The MARS behaviour allows Layer 3 multicasting to be supported using either
meshes of VCs or ATM level multicast servers. This choice may be made on a 
per-group basis, and is transparent to the endpoints.                      

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