RFC 3940

Negative-acknowledgment (NACK)-Oriented Reliable Multicast (NORM) Protocol, November 2004

Canonical URL:
https://www.rfc-editor.org/rfc/rfc3940.txt
File formats:
Plain TextPDF
Status:
EXPERIMENTAL
Obsoleted by:
RFC 5740
Authors:
B. Adamson
C. Bormann
M. Handley
J. Macker
Stream:
IETF
Source:
rmt (tsv)

Cite this RFC: TXT  |  XML

DOI:  10.17487/RFC3940

Discuss this RFC: Send questions or comments to rmt@ietf.org

Other actions: Submit Errata  |  Find IPR Disclosures from the IETF


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. This memo defines an Experimental Protocol for the Internet community.


For the definition of Status, see RFC 2026.

For the definition of Stream, see RFC 4844.


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