I-D ACTION:draft-ietf-idmr-cbt-spec-02.txt

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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     : Core Based Trees (CBT) Multicast  -- Protocol 
                   Specification --                                        
       Author(s) : A. Ballardie, N. Jain, S. Reeve
       Filename  : draft-ietf-idmr-cbt-spec-02.txt
       Pages     : 26
       Date      : 06/21/1995

This document describes the Core Based Tree (CBT) multicast protocol 
specification. CBT is a next-generation multicast protocol that makes use 
of a shared delivery tree rather than separate per-sender trees utilized by
most other multicast schemes [1, 2, 3].     

The specification includes a description of an optimization whereby native 
IP-style multicasts are forwarded over tree branches as well as 
subnetworks with group member presence. This mode of operation will be 
called CBT "native mode" and obviates the need to insert a CBT header 
into data packets before forwarding over CBT interfaces. Native mode is 
only relevant to CBT-only domains or ``clouds''.         

The CBT architecture is described in an accompanying document: 
draft-ietf-idmr-arch-00.txt.  Other related documents include [4, 5].         

We describe the protocol details by means of example using the 
topology shown in figure 1. Examples show how a host joins a group 
and leaves a group, and we also show various tree maintenance scenarios.                                                                 

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