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Core Based Trees (CBT version 3) Multicast Routing -- Protocol Specification --

Document Type Expired Internet-Draft (idmr WG)
Expired & archived
Authors Anthony J. Ballardie , Bradley Cain , Zhaohui (Jeffrey) Zhang
Last updated 1998-07-31
RFC stream Internet Engineering Task Force (IETF)
Intended RFC status (None)
Additional resources Mailing list discussion
Stream WG state WG Document
Document shepherd (None)
IESG IESG state Expired
Consensus boilerplate Unknown
Telechat date (None)
Responsible AD (None)
Send notices to (None)

This Internet-Draft is no longer active. A copy of the expired Internet-Draft is available in these formats:


This document describes the Core Based Tree (CBT version 3) network layer multicast routing protocol. CBT builds a shared multicast dis- tribution 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 specification supercedes and obsoletes RFC 2189. Changes from RFC 2189 include support for source specific joining and pruning to provide better CBT transit domain capability, new packet formats, and new robustness features. Section 1 documents the primary changes to RFC 2189. This document is progressing through the IDMR working group of the IETF. CBT related documents include [1, 2, 3, 5, 8]. For all IDMR- related documents, see


Anthony J. Ballardie
Bradley Cain
Zhaohui (Jeffrey) Zhang

(Note: The e-mail addresses provided for the authors of this Internet-Draft may no longer be valid.)