I-D ACTION:draft-armitage-ion-venus-02.txt

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       Title     : VENUS - Very Extensive Non-Unicast Service              
       Author(s) : G. Armitage
       Filename  : draft-armitage-ion-venus-02.txt
       Pages     : 12
       Date      : 04/22/1997

The MARS model (RFC2022) provides a solution to intra-LIS IP multicasting 
over ATM, establishing and managing the use of ATM pt-mpt SVCs for IP 
multicast packet forwarding. Inter-LIS multicast forwarding is achieved 
using Mrouters, in a similar manner to which the `Classical IP over ATM' 
model uses Routers to inter-connect LISes for unicast traffic. The 
development of unicast IP shortcut mechanisms (e.g.  NHRP) has led some 
people to request the development of a Multicast equivalent. There are a 
number of different approaches. This document focuses exclusively on the 
problems associated with extending the MARS model to cover multiple 
clusters or clusters spanning more than one subnet. It describes a 
hypothetical solution, dubbed `Very Extensive NonUnicast Service' (VENUS), 
and shows how complex such a service would be. It is also noted that VENUS 
ultimately has the look and feel of a single, large cluster using a 
distributed MARS.  This document is being issued to help focus ION efforts 
towards alternative solutions for establishing ATM level multicast 
connections between LISes.                                                 

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