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SCTP Tail Loss Recovery Enhancements
draft-nielsen-tsvwg-sctp-tlr-01

The information below is for an old version of the document.
Document Type
This is an older version of an Internet-Draft whose latest revision state is "Expired".
Expired & archived
Author karen Nielsen
Last updated 2015-05-15 (Latest revision 2014-11-11)
RFC stream (None)
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Stream Stream state (No stream defined)
Consensus boilerplate Unknown
RFC Editor Note (None)
IESG IESG state Expired
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This Internet-Draft is no longer active. A copy of the expired Internet-Draft is available in these formats:

Abstract

Loss Recovery by means of T3-Retransmission has significant detrimental impact on the delays experienced through an SCTP association. The throughput achievable over an SCTP association also is negatively impacted by the occurence of T3-Retransmissions. Loss Recovery by Fast Retransmission operation is in most situations superior to T3-Retransmission from a latency and a throughput perspective. The present SCTP Fast Recovery algorithms as specified by [RFC4960] are not able to adequately or timely recover losses in certain situations, thus resorting to loss recovery by lengthy T3-Retransimissions or by non-timely activation of Fast Recovery. In this document we propose for a number of enhancements to the SCTP Loss Recovery algorithms aimed to amend some of these deficiencies with a particular focus on Loss Recovery for drops in Traffic Tails. The enhancements supplement the existing algorithms of [RFC4960] with proactive probing and timer driven activation of the Fast Retransmission algorithm as well as a number of enhancements of the Fast Retransmission algorithm in itself are proposed. The enhancement are proposed as supplements to the Loss Recovery algorithms of [RFC4960] and as such they do not deprecate or replace any of the mechanisms defined by [RFC4960]. The solution proposed draws on prior art in the area of SCTP and TCP Loss Recovery improvements. The mechanisms proposed include the adjustment to SCTP Fast Retransmission of certain improvements specified for TCP Fast Retransmission by [RFC6675] as well as the proposal embeds SCTP Early Retransmit [RFC5827] in a delayed variant. The proposal heavily draws on the ideas put forward for TCP by [DUKKIPATI01] for proactive probing and timer driven entering of Fast Recovery. The proposal embeds certain aspects from [HURTIG] when applicable. The procedures proposed are sender-side only and do not impact the SCTP receiver.

Authors

karen Nielsen

(Note: The e-mail addresses provided for the authors of this Internet-Draft may no longer be valid.)