I-D ACTION:draft-ietf-idmr-pim-arch-01.txt, .ps

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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 Inter-Domain Multicast 
Routing Working Group of the IETF.                                         

       Title     : Protocol Independent Multicast (PIM): 
                   Motivation and Architecture                                            
       Author(s) : S. Deering, D. Estrin, D. Farinacci, 
                   V. Jacobson, C. Liu, L. Wei
       Filename  : draft-ietf-idmr-pim-arch-01.txt, .ps
       Pages     : 32
       Date      : 01/17/1995

Existing multicast routing mechanisms were intended for use within regions 
where a group is widely represented or bandwidth is universally plentiful. 
When group members, and senders to those group members, are distributed 
sparsely across a wide area, these schemes are not efficient; data packets 
or membership report information are periodically sent over many links that
do not lead to receivers or senders, respectively. This characteristic lead
us to develop a multicast routing architecture that efficiently establishes
distribution trees across wide-area internets, where many groups will be 
sparsely represented and where bandwidth is not uniformly plentiful due to 
the distances and multiple administrations traversed.  Efficiency is 
evaluated in terms of the state, control message processing, and data 
packet processing required across the entire network in order to deliver 
data packets to the members of the group. The architecture also includes a 
more traditional, dense mode of operation  for use within campus networks 
or other regions characterized by plentiful bandwidth.                     

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