SACK-IMMEDIATELY Extension for the Stream Control Transmission Protocol
draft-tuexen-tsvwg-sctp-sack-immediately-08

The information below is for an old version of the document
Document Type Active Internet-Draft (individual)
Last updated 2011-10-29 (latest revision 2011-09-02)
Replaced by draft-ietf-tsvwg-sctp-sack-immediately
Stream (None)
Intended RFC status (None)
Formats plain text pdf html
Stream Stream state (No stream defined)
Document shepherd None
IESG IESG state I-D Exists
Telechat date
Responsible AD (None)
Send notices to (None)
Network Working Group                                          M. Tuexen
Internet-Draft                                              I. Ruengeler
Intended status: Standards Track        Muenster Univ. of Appl. Sciences
Expires: May 1, 2012                                          R. Stewart
                                                          Adara Networks
                                                        October 29, 2011

SACK-IMMEDIATELY Extension for the Stream Control Transmission Protocol
            draft-tuexen-tsvwg-sctp-sack-immediately-08.txt

Abstract

   This document defines a method for the sender of a DATA chunk to
   indicate that the corresponding SACK chunk should be sent back
   immediately and not be delayed.

Status of this Memo

   This Internet-Draft is submitted in full conformance with the
   provisions of BCP 78 and BCP 79.

   Internet-Drafts are working documents of the Internet Engineering
   Task Force (IETF).  Note that other groups may also distribute
   working documents as Internet-Drafts.  The list of current Internet-
   Drafts is at http://datatracker.ietf.org/drafts/current/.

   Internet-Drafts are draft documents valid for a maximum of six months
   and may be updated, replaced, or obsoleted by other documents at any
   time.  It is inappropriate to use Internet-Drafts as reference
   material or to cite them other than as "work in progress."

   This Internet-Draft will expire on May 1, 2012.

Copyright Notice

   Copyright (c) 2011 IETF Trust and the persons identified as the
   document authors.  All rights reserved.

   This document is subject to BCP 78 and the IETF Trust's Legal
   Provisions Relating to IETF Documents
   (http://trustee.ietf.org/license-info) in effect on the date of
   publication of this document.  Please review these documents
   carefully, as they describe your rights and restrictions with respect
   to this document.  Code Components extracted from this document must
   include Simplified BSD License text as described in Section 4.e of
   the Trust Legal Provisions and are provided without warranty as
   described in the Simplified BSD License.

Tuexen, et al.             Expires May 1, 2012                  [Page 1]
Internet-Draft              SACK-IMMEDIATELY                October 2011

Table of Contents

   1.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . . . 3
   2.  Conventions . . . . . . . . . . . . . . . . . . . . . . . . . . 3
   3.  The I-bit in the DATA Chunk Header  . . . . . . . . . . . . . . 4
   4.  Procedures  . . . . . . . . . . . . . . . . . . . . . . . . . . 4
     4.1.  Sender Side Considerations  . . . . . . . . . . . . . . . . 4
     4.2.  Receiver Side Considerations  . . . . . . . . . . . . . . . 5
   5.  Interoperability Considerations . . . . . . . . . . . . . . . . 5
   6.  Socket API Considerations . . . . . . . . . . . . . . . . . . . 5
   7.  IANA Considerations . . . . . . . . . . . . . . . . . . . . . . 5
   8.  Security Considerations . . . . . . . . . . . . . . . . . . . . 6
   9.  Acknowledgments . . . . . . . . . . . . . . . . . . . . . . . . 6
   10. References  . . . . . . . . . . . . . . . . . . . . . . . . . . 6
     10.1. Normative References  . . . . . . . . . . . . . . . . . . . 6
     10.2. Informative References  . . . . . . . . . . . . . . . . . . 6
   Authors' Addresses  . . . . . . . . . . . . . . . . . . . . . . . . 6

Tuexen, et al.             Expires May 1, 2012                  [Page 2]
Internet-Draft              SACK-IMMEDIATELY                October 2011

1.  Introduction

   According to [RFC4960] the receiver of a DATA chunk should use
   delayed SACKs.  This delaying is completely controlled by the
   receiver of the DATA chunk.

   In specific situations the delaying of SACKs results in reduced
   performance of the protocol.  If such a situation can be detected by
   the receiver, the corresponding SACK can be sent immediately.  For
   example, [RFC4960] recommends the immediate sending if the receiver
   has detected message loss or message duplication.  However, if the
   situation can only be detected by the sender of the DATA chunk,
   [RFC4960] provides no method of avoiding the delaying of the SACK.
   Thus the protocol performance might be reduced.

   This document overcomes this limitation and describes a simple
   extension of the SCTP DATA chunk by defining a new flag, the I-bit.
   The sender of a DATA chunk indicates by setting this bit that the
   corresponding SACK chunk should not be delayed.

   Upper layers of SCTP using the socket API as defined in
   [I-D.ietf-tsvwg-sctpsocket] may subscribe to the
   SCTP_SENDER_DRY_EVENT for getting a notification as soon as no user
   data is outstanding anymore.  To avoid an unnecessary delay while
Show full document text