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Core Based Trees (CBT) Multicast Routing Architecture (RFC2201)

IP.com Disclosure Number: IPCOM000002759D
Original Publication Date: 1997-Sep-01
Included in the Prior Art Database: 2000-Sep-13
Document File: 13 page(s) / 36K

Publishing Venue

Internet Society Requests For Comment (RFCs)

Related People

A. Ballardie: AUTHOR

Abstract

CBT is a multicast routing architecture that builds a single delivery tree per group which is shared by all of the group's senders and receivers. Most multicast algorithms build one multicast tree per sender (subnetwork), the tree being rooted at the sender's subnetwork. The primary advantage of the shared tree approach is that it typically offers more favourable scaling characteristics than all other multicast algorithms.

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Network Working Group A. Ballardie

Request for Comments: 2201 Consultant

Category: Experimental September 1997

Core Based Trees (CBT) Multicast Routing Architecture

Status of this Memo

This memo defines an Experimental Protocol for the Internet

community. This memo does not specify an Internet standard of any

kind. Discussion and suggestions for improvement are requested.

Distribution of this memo is unlimited.

Abstract

CBT is a multicast routing architecture that builds a single delivery

tree per group which is shared by all of the group's senders and

receivers. Most multicast algorithms build one multicast tree per

sender (subnetwork), the tree being rooted at the sender's

subnetwork. The primary advantage of the shared tree approach is

that it typically offers more favourable scaling characteristics than

all other multicast algorithms.

The CBT protocol [1] is a network layer multicast routing protocol

that builds and maintains a shared delivery tree for a multicast

group. The sending and receiving of multicast data by hosts on a

subnetwork conforms to the traditional IP multicast service model

[2].

CBT is progressing through the IDMR working group of the IETF. The

CBT protocol is described in an accompanying document [1]. For this,

and all IDMR-related documents, see http://www.cs.ucl.ac.uk/ietf/idmr

TABLE OF CONTENTS

1. Background................................................... 2

2. Introduction................................................. 2

3. Source Based Tree Algorithms................................. 3

3.1 Distance-Vector Multicast Algorithm...................... 4

3.2 Link State Multicast Algorithm........................... 5

3.3 The Motivation for Shared Trees.......................... 5

4. CBT - The New Architecture................................... 7

4.1 Design Requirements...................................... 7

4.2 Components & Functions................................... 8

4.2.1 CBT Control Message Retransmission Strategy........ 10

4.2.2 Non-Member Sending................................. 11

5. Interoperability with Other Multicast Routing Protocols ..... 11

6. Core Router Discovery........................................ 11

6.1 Bootstrap Mechanism Overview............................. 12

7. Summary ..................................................... 13

8. Security Considerations...................................... 13

Acknowledgements ................................