RFC 2189 (rfc2189) - Page 1 of 23

Core Based Trees (CBT version 2) Multicast Routing -- Protocol Specification --

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Network Working Group                                       A. Ballardie
Request for Comments: 2189                                    Consultant
Category: Experimental                                    September 1997



           Core Based Trees (CBT version 2) Multicast Routing

                      -- Protocol Specification --


Status of this Memo

   This memo defines an Experimental Protocol for the Internet
   community.  It does not specify an Internet standard of any kind.
   Discussion and suggestions for improvement are requested.
   Distribution of this memo is unlimited.

Abstract

   This document describes the Core Based Tree (CBT version 2) network
   layer multicast routing protocol. CBT builds a shared multicast
   distribution tree per group, and is suited to inter- and intra-domain
   multicast routing.

   CBT may use a separate multicast routing table, or it may use that of
   underlying unicast routing, to establish paths between senders and
   receivers. The CBT architecture is described in [1].

   This document is progressing through the IDMR working group of the
   IETF.  CBT related documents include [1, 5, 6]. For all IDMR-related
   documents, see http://www.cs.ucl.ac.uk/ietf/idmr.

TABLE OF CONTENTS

  1. Changes Since Previous version............................. 2
  2. Introduction & Terminology................................. 3
  3. CBT Functional Overview.................................... 3
  4. CBT Protocol Specificiation Details........................ 6
     4.1 CBT HELLO Protocol..................................... 6
         4.1.1 Sending HELLOs................................... 7
         4.1.2 Receiving HELLOs................................. 7
     4.2 JOIN_REQUEST Processing................................ 8
         4.2.1 Sending JOIN_REQUESTs............................ 8
         4.2.2 Receiving JOIN_REQUESTs.......................... 8
     4.3 JOIN_ACK Processing.................................... 9
         4.3.1 Sending JOIN_ACKs................................ 9
         4.3.2 Receiving JOIN_ACKs.............................. 9



Ballardie                     Experimental
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