I-D ACTION:draft-armitage-ion-venus-01.txt

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       Title     : VENUS - Very Extensive Non-Unicast Service              
       Author(s) : G. Armitage
       Filename  : draft-armitage-ion-venus-01.txt
       Pages     : 12
       Date      : 02/19/1997

The MARS model is our current solution to IP multicasting over ATM, 
establishing and managing the use of ATM pt-mpt SVCs for intra-LIS 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. This document 
describes a hypothetical solution, dubbed `Very Extensive NonUnicast 
Service' (VENUS), shows how complex such a service would be, and asserts 
that analogies with unicast shortcut mechanisms are not entirely 
appropriate. 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.                                    

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