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Negative-acknowledgment (NACK)-Oriented Reliable Multicast (NORM) Protocol (RFC3940)

IP.com Disclosure Number: IPCOM000032705D
Original Publication Date: 2004-Nov-01
Included in the Prior Art Database: 2004-Nov-10

Publishing Venue

Internet Society Requests For Comment (RFCs)

Related People

B. Adamson: AUTHOR [+4]

Abstract

This document describes the messages and procedures of the Negative- acknowledgment (NACK) Oriented Reliable Multicast (NORM) protocol. This protocol is designed to provide end-to-end reliable transport of bulk data objects or streams over generic IP multicast routing and forwarding services. NORM uses a selective, negative acknowledgment mechanism for transport reliability and offers additional protocol mechanisms to allow for operation with minimal "a priori" coordination among senders and receivers. A congestion control scheme is specified to allow the NORM protocol to fairly share available network bandwidth with other transport protocols such as Transmission Control Protocol (TCP). It is capable of operating with both reciprocal multicast routing among senders and receivers and with asymmetric connectivity (possibly a unicast return path) between the senders and receivers. The protocol offers a number of features to allow different types of applications or possibly other higher level transport protocols to utilize its service in different ways. The protocol leverages the use of FEC-based repair and other IETF reliable multicast transport (RMT) building blocks in its design.

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Network Working Group                                         B. Adamson

Request for Comments: 3940                                           NRL

Category: Experimental                                        C. Bormann

                                                 Universitaet Bremen TZI

                                                              M. Handley

                                                                     UCL

                                                               J. Macker

                                                                     NRL

                                                           November 2004

                Negative-acknowledgment (NACK)-Oriented

                   Reliable Multicast (NORM) Protocol

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 describes the messages and procedures of the Negative-

   acknowledgment (NACK) Oriented Reliable Multicast (NORM) protocol.

   This protocol is designed to provide end-to-end reliable transport of

   bulk data objects or streams over generic IP multicast routing and

   forwarding services.  NORM uses a selective, negative acknowledgment

   mechanism for transport reliability and offers additional protocol

   mechanisms to allow for operation with minimal "a priori"

   coordination among senders and receivers.  A congestion control

   scheme is specified to allow the NORM protocol to fairly share

   available network bandwidth with other transport protocols such as

   Transmission Control Protocol (TCP).  It is capable of operating with

   both reciprocal multicast routing among senders and receivers and

   with asymmetric connectivity (possibly a unicast return path) between

   the senders and receivers.  The protocol offers a number of features

   to allow different types of applications or possibly other higher

   level transport protocols to utilize its service in different ways.

   The protocol leverages the use of FEC-based repair and other IETF

   reliable multicast transport (RMT) building blocks in its design.

Adamson, et al.               Experimental          ...