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ECN for Stream Control Transmission Protocol (SCTP)
draft-stewart-tsvwg-sctpecn-05

Document type: Active Internet-Draft (individual)
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Last updated: 2014-01-15
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Network Working Group                                         R. Stewart
Internet-Draft                                            Adara Networks
Intended status: Standards Track                               M. Tuexen
Expires: July 19, 2014                  Muenster Univ. of Appl. Sciences
                                                                 X. Dong
                                                                  Huawei
                                                        January 15, 2014

          ECN for Stream Control Transmission Protocol (SCTP)
                   draft-stewart-tsvwg-sctpecn-05.txt

Abstract

   This document describes the addition of the ECN to the Stream Control
   Transmission Protocol (SCTP).

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
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   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 July 19, 2014.

Copyright Notice

   Copyright (c) 2014 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
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   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.

Stewart, et al.           Expires July 19, 2014                 [Page 1]
Internet-Draft                ECN for SCTP                  January 2014

Table of Contents

   1.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . .   2
   2.  Conventions . . . . . . . . . . . . . . . . . . . . . . . . .   3
   3.  Terminology . . . . . . . . . . . . . . . . . . . . . . . . .   3
   4.  Chunk and Parameter Formats . . . . . . . . . . . . . . . . .   3
     4.1.  ECN Support Parameter (32768) . . . . . . . . . . . . . .   3
     4.2.  ECN Echo (12) . . . . . . . . . . . . . . . . . . . . . .   3
     4.3.  CWR Chunk(13) . . . . . . . . . . . . . . . . . . . . . .   4
   5.  Procedures  . . . . . . . . . . . . . . . . . . . . . . . . .   5
     5.1.  SCTP Initialization . . . . . . . . . . . . . . . . . . .   5
     5.2.  The SCTP Sender . . . . . . . . . . . . . . . . . . . . .   6
     5.3.  The SCTP Receiver . . . . . . . . . . . . . . . . . . . .   8
     5.4.  Congestion on the SACK path . . . . . . . . . . . . . . .   9
     5.5.  Retransmitted SCTP Packets  . . . . . . . . . . . . . . .   9
     5.6.  SCTP Window Probes  . . . . . . . . . . . . . . . . . . .  10
   6.  Security Considerations . . . . . . . . . . . . . . . . . . .  10
   7.  IANA Considerations . . . . . . . . . . . . . . . . . . . . .  10
   8.  Acknowledgements  . . . . . . . . . . . . . . . . . . . . . .  10
   9.  References  . . . . . . . . . . . . . . . . . . . . . . . . .  10
     9.1.  Normative references  . . . . . . . . . . . . . . . . . .  10
     9.2.  Informational References  . . . . . . . . . . . . . . . .  10
   Authors' Addresses  . . . . . . . . . . . . . . . . . . . . . . .  11

1.  Introduction

   At the time SCTP was initially defined in [RFC2960] ECN - [RFC2481]
   was still an experimental document.  This left the authors of SCTP in
   a position where they could not directly refer to ECN without
   creating a normative reference in a standards track document to an
   experimental RFC.  To work around this problem the authors of SCTP
   decided to add two reserved chunk types for ECN (CWR and ECNE) but
   did not fully specify how they were to be used except in a vague way
   within an appendix of the document.  This worked around the document
   reference problem, but left ECN and its implementation for SCTP
   unspecified.  This document is intended to fill in the details of ECN
   processing in SCTP in a standards track document.

   This document assumes that the reader is familiar with ECN [RFC3168].
   Readers unfamiliar with ECN are strongly encouraged to first read
   [RFC3168] since this document will not repeat any of the details on

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