Negative-Acknowledgment (NACK)-Oriented Reliable Multicast (NORM) Building Blocks
RFC 3941
| Document | Type |
RFC - Experimental
(November 2004; No errata)
Obsoleted by RFC 5401
Was draft-ietf-rmt-bb-norm (rmt WG)
|
|
|---|---|---|---|
| Last updated | 2013-03-02 | ||
| Stream | IETF | ||
| Formats | plain text pdf htmlized bibtex | ||
| Stream | WG state | (None) | |
| Document shepherd | No shepherd assigned | ||
| IESG | IESG state | RFC 3941 (Experimental) | |
| Consensus Boilerplate | Unknown | ||
| Telechat date | |||
| Responsible AD | Allison Mankin | ||
| Send notices to | lorenzo@cisco.com, rogerkermode@msn.com | ||
Network Working Group B. Adamson
Request for Comments: 3941 NRL
Category: Experimental C. Bormann
Universitaet Bremen TZI
M. Handley
UCL
J. Macker
NRL
November 2004
Negative-Acknowledgment (NACK)-Oriented Reliable Multicast (NORM)
Building Blocks
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.
Copyright Notice
Copyright (C) The Internet Society (2004).
Abstract
This document discusses the creation of negative-acknowledgment
(NACK)-oriented reliable multicast (NORM) protocols. The rationale
for NORM goals and assumptions are presented. Technical challenges
for NACK-oriented (and in some cases general) reliable multicast
protocol operation are identified. These goals and challenges are
resolved into a set of functional "building blocks" that address
different aspects of NORM protocol operation. It is anticipated that
these building blocks will be useful in generating different
instantiations of reliable multicast protocols.
Adamson, et al. Experimental [Page 1]
RFC 3941 NORM Building Blocks November 2004
Table of Contents
1. Introduction . . . . . . . . . . . . . . . . . . . . . . . . . 3
2. Rationale. . . . . . . . . . . . . . . . . . . . . . . . . . . 4
2.1. Delivery Service Model . . . . . . . . . . . . . . . . . 4
2.2. Group Membership Dynamics . . . . . . . . . . . . . . . . 5
2.3. Sender/Receiver Relationships . . . . . . . . . . . . . . 5
2.4. Group Size Scalability. . . . . . . . . . . . . . . . . . 6
2.5. Data Delivery Performance . . . . . . . . . . . . . . . . 6
2.6. Network Environments. . . . . . . . . . . . . . . . . . . 6
2.7. Router/Intermediate System Assistance . . . . . . . . . . 7
3. Functionality. . . . . . . . . . . . . . . . . . . . . . . . . 7
3.1. NORM Sender Transmission. . . . . . . . . . . . . . . . . 10
3.2. NORM Repair Process . . . . . . . . . . . . . . . . . . . 11
3.2.1. Receiver NACK Process Initiation . . . . . . . . . 11
3.2.2. NACK Suppression . . . . . . . . . . . . . . . . . 13
3.2.3. NACK Content . . . . . . . . . . . . . . . . . . . 17
3.2.3.1. NACK and FEC Repair Strategies. . . . . . 17
3.2.3.2. NACK Content Format . . . . . . . . . . . 20
3.2.4. Sender Repair Response . . . . . . . . . . . . . . 21
3.3. NORM Receiver Join Policies and Procedures. . . . . . . . 23
3.4. Reliable Multicast Member Identification. . . . . . . . . 24
3.5. Data Content Identification . . . . . . . . . . . . . . . 24
3.6. Forward Error Correction (FEC). . . . . . . . . . . . . . 26
3.7. Round-trip Timing Collection. . . . . . . . . . . . . . . 27
3.7.1. One-to-Many Sender GRTT Measurement. . . . . . . . 27
3.7.2. One-to-Many Receiver RTT Measurement . . . . . . . 29
3.7.3. Many-to-Many RTT Measurement . . . . . . . . . . . 29
3.7.4. Sender GRTT Advertisement. . . . . . . . . . . . . 30
3.8. Group Size Determination/Estimation . . . . . . . . . . . 31
3.9. Congestion Control Operation. . . . . . . . . . . . . . . 31
3.10 Router/Intermediate System Assistance . . . . . . . . . . 31
3.11 NORM Applicability. . . . . . . . . . . . . . . . . . . . 31
4. Security Considerations. . . . . . . . . . . . . . . . . . . . 32
5. Acknowledgements . . . . . . . . . . . . . . . . . . . . . . . 33
6. References . . . . . . . . . . . . . . . . . . . . . . . . . . 33
6.1. Normative References. . . . . . . . . . . . . . . . . . . 33
6.2. Informative References. . . . . . . . . . . . . . . . . . 33
7. Authors' Addresses . . . . . . . . . . . . . . . . . . . . . . 35
Full Copyright Statement . . . . . . . . . . . . . . . . . . . 36
Adamson, et al. Experimental [Page 2]
RFC 3941 NORM Building Blocks November 2004
1. Introduction
Reliable multicast transport is a desirable technology for the
efficient and reliable distribution of data to a group on the
Internet. The complexities of group communication paradigms
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