TCP-Friendly Multicast Congestion Control (TFMCC): Protocol Specification
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From: The IESG <firstname.lastname@example.org> To: IETF-Announce <email@example.com> Cc: Internet Architecture Board <firstname.lastname@example.org>, RFC Editor <email@example.com>, rmt mailing list <firstname.lastname@example.org>, rmt chair <email@example.com> Subject: Document Action: 'TCP-Friendly Multicast Congestion Control (TFMCC): Protocol Specification' to Experimental RFC The IESG has approved the following document: - 'TCP-Friendly Multicast Congestion Control (TFMCC): Protocol Specification ' <draft-ietf-rmt-bb-tfmcc-08.txt> as an Experimental RFC This document is the product of the Reliable Multicast Transport Working Group. The IESG contact persons are Magnus Westerlund and Lars Eggert. A URL of this Internet-Draft is: http://www.ietf.org/internet-drafts/draft-ietf-rmt-bb-tfmcc-08.txt
Technical Summary This document specifies TCP-Friendly Multicast Congestion Control (TFMCC). TFMCC is a source-based, single-rate congestion control scheme that builds upon the unicast TCP-Friendly Rate Control mechanism (TFRC) (RFC3448). TFMCC is stable and responsive under a wide range of network conditions and scales to receiver sets on the order of several thousand receivers. To support scalability, as much congestion control functionality as possible is located at the receivers. Each receiver continuously determines a desired receive rate that is TCP-friendly for the path from the sender to this receiver. Selected receivers then report the rate to the sender in feedback packets. TFMCC is designed to be reasonably fair when competing for bandwidth with TCP flows. TFMCC is a building block as defined in RFC 3048. Working Group Summary There is strong consensus to publish this document with the intention to gain experience and later re-submit it for standards track. Protocol Quality The TFMCC algorithm described in this protocol is based on its Unicast counterpart (TFRC) published as IETF RFC 3448. It was extensively tested through simulations by the authors and by others (Mark Pullen and associates, see RMT WG archives), that provided feedback based on their independent simulations. The feedback has been addressed by the authors. We know of at least one successful implementation of TFMCC by Brian Adamson, who incorporated it in its implementation of the RMT "NORM" protocol and who also provide feedback to the authors. The responsible AD was Magnus Westerlund and Lorenzo Vicisano the WG shepherd. Note to RFC Editor NEW: Add to end of section 1. Introduction Prior to 1.1. Statement of Intent This memo contains part of the definitions necessary to fully specify a Reliable Multicast Transport protocol in accordance with RFC 2357. As per RFC 2357, the use of any reliable multicast protocol in the Internet requires an adequate congestion control scheme. This document specifies an experimental congestion control scheme. While waiting for initial deployment and experience to show this scheme to be effective and scalable, the IETF publishes this scheme in the "Experimental" category. It is the intent of the Reliable Multicast Transport (RMT) Working Group to re-submit the specification as an IETF Proposed Standard as soon as the scheme is deemed adequate.