A New Internet-Draft is available from the on-line Internet-Drafts directories.
This draft is a work item of the Reliable Multicast Transport Working Group of the IETF.
Title : NACK-Oriented Reliable Multicast Protocol (NORM)
Author(s) : B. Adamson, et al.
Filename : draft-ietf-rmt-pi-norm-10.txt,.pdf
Pages : 70
Date : 2004-7-15
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 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
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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