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I-D ACTION:draft-pullen-srmp-02.txt



A New Internet-Draft is available from the on-line Internet-Drafts directories.


	Title		: Selectively Reliable Multicast Protocol (SRMP)
	Author(s)	: M. Pullen et al.
	Filename	: draft-pullen-srmp-02.txt
	Pages		: 24
	Date		: 2003-6-19
	
The Selectively Reliable Multicast Protocol (SRMP) is a transport
protocol, intended to deliver a mix of reliable and best-effort 
messages in an any-to-any multicast environment, where the best-
effort traffic occurs in significantly greater volume than the 
reliable traffic and therefore can be used to carry sequence 
numbers of reliable messages for loss detection. SRMP is intended 
for use in a distributed simulation application environment, where 
only the latest value of reliable transmission for any particular 
data identifier requires delivery.
SRMP has two sublayers: a bundling sublayer that combines short 
messages, peforms NAK suppression, and incorporates the TCP-Friendly 
Multicast Congestion Control of Widmer and Handley, dropping best-
effort traffic in order to achieve congestion control; and a 
selectively reliable transport (SRT) sublayer that formats best-
effort and reliable transmissions and also creates negative 
acknowledgements when loss of reliable messages is detected.
In SRMP, selection between reliable and best-effort messages is
performed by the application. The protocol bundles messages within
a configured time interval, attempting to achieve a configured
bundle size which typically is set to the expected smallest MTU
in the delivery path. The bundle header carries the latest sequence
number for each reliable transmission. Rate reduction is achieved
when necessary by dropping best-effort messages at random.

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