A New Internet-Draft is available from the on-line Internet-Drafts directories.
This draft is a work item of the Transport Area Working Group Working Group of the IETF.
Title : Quick-Start for TCP and IP
Author(s) : S. Floyd, et al.
Filename : draft-ietf-tsvwg-quickstart-01.txt,.ps
Pages : 76
Date : 2005-10-14
This document specifies an optional Quick-Start mechanism for
transport protocols, in cooperation with routers, to determine an
allowed sending rate at the start and at times in the middle of a
data transfer (e.g., after an idle period). While Quick-Start is
designed to be used by a range of transport protocols, in this
document we describe its use with TCP. By using Quick-Start, a TCP
host, say, host A, would indicate its desired sending rate in bytes
per second, using a Quick Start Request option in the IP header of a
TCP packet. Each router along the path could, in turn, either
approve the requested rate, reduce the requested rate, or indicate
that the Quick-Start request is not approved. If the Quick-Start
request is not approved, then the sender would use the default
congestion control mechanisms. The Quick-Start mechanism can
determine if there are routers along the path that do not understand
the Quick-Start Request option, or have not agreed to the Quick-
Start rate request. TCP host B communicates the final rate request
to TCP host A in a transport-level Quick-Start Response in an
answering TCP packet. Quick-Start is designed to allow connections
to use higher sending rates when there is significant unused
bandwidth along the path, and all of the routers along the path
support the Quick-Start Request.
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