Stream Schedulers and a New Data Chunk for the Stream Control Transmission Protocol
draft-ietf-tsvwg-sctp-ndata-02

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Last updated 2015-01-11
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Network Working Group                                         R. Stewart
Internet-Draft                                             Netflix, Inc.
Intended status: Standards Track                               M. Tuexen
Expires: July 15, 2015                  Muenster Univ. of Appl. Sciences
                                                               S. Loreto
                                                                Ericsson
                                                           R. Seggelmann
                                            T-Systems International GmbH
                                                        January 11, 2015

     Stream Schedulers and a New Data Chunk for the Stream Control
                         Transmission Protocol
                   draft-ietf-tsvwg-sctp-ndata-02.txt

Abstract

   The Stream Control Transmission Protocol (SCTP) is a message oriented
   transport protocol supporting arbitrary large user messages.
   However, the sender can not interleave different user messages which
   causes head of line blocking at the sender side.  To overcome this
   limitation, this document adds a new data chunk to SCTP.

Status of This Memo

   This Internet-Draft is submitted in full conformance with the
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   This Internet-Draft will expire on July 15, 2015.

Copyright Notice

   Copyright (c) 2015 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

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   publication of this document.  Please review these documents
   carefully, as they describe your rights and restrictions with respect
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Table of Contents

   1.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . .   2
   2.  N-DATA Chunk  . . . . . . . . . . . . . . . . . . . . . . . .   3
   3.  Procedures  . . . . . . . . . . . . . . . . . . . . . . . . .   4
   4.  Socket API Considerations . . . . . . . . . . . . . . . . . .   5
   5.  IANA Considerations . . . . . . . . . . . . . . . . . . . . .   8
   6.  Security Considerations . . . . . . . . . . . . . . . . . . .   9
   7.  Acknowledgments . . . . . . . . . . . . . . . . . . . . . . .   9
   8.  References  . . . . . . . . . . . . . . . . . . . . . . . . .  10
   Authors' Addresses  . . . . . . . . . . . . . . . . . . . . . . .  10

1.  Introduction

1.1.  Overview

   When SCTP [RFC4960] was initially designed it was mainly envisioned
   for transport of small signaling messages.  Late in the design stage
   it was decided to add support for fragmentation and reassembly of
   larger messages with the thought that someday Session Initiation
   Protocol (SIP) [RFC3261] style signaling messages may also need to
   use SCTP and a single MTU sized message would be too small.
   Unfortunately this design decision, though valid at the time, did not
   account for other applications which might send very large messages
   over SCTP.  When such large messages are now sent over SCTP a form of
   sender side head of line blocking becomes created within the
   protocol.  This head of line blocking is caused by the use of the
   Transmission Sequence Number (TSN) for two different purposes:

   1.  As an identifier for DATA chunks to provide a reliable transfer.

   2.  As an identifier for the sequence of fragments to allow
       reassembly.

   The protocol requires all fragments of a user message to have
   consecutive TSNs.  Therefore the sender can not interleave different
   messages.

   This document describes a new Data chunk called N-DATA.  This chunk
   incorporates all the flags and properties of the current SCTP Data
   chunk but also adds a new field in its chunk header, the Fragment

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   Sequence Number (FSN).  Then the FSN is only used for reassembly and
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