Name: draft-amit-quick-start-03
Title: Quick-Start for TCP and IP
State: Active
Authors: Amit Jain, Sally Floyd
Group: Individual Submissions (none)
Date: 2004-09-27
This draft 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. 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. A Quick-Start request for a higher sending rate would be sent in 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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