Stream Control Transmission Protocol (SCTP) Stream Reconfiguration
RFC 6525

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Internet Engineering Task Force (IETF)                        R. Stewart
Request for Comments: 6525                                Adara Networks
Category: Standards Track                                      M. Tuexen
ISSN: 2070-1721                         Muenster Univ. of Appl. Sciences
                                                                  P. Lei
                                                     Cisco Systems, Inc.
                                                           February 2012

   Stream Control Transmission Protocol (SCTP) Stream Reconfiguration

Abstract

   Many applications that use the Stream Control Transmission Protocol
   (SCTP) want the ability to "reset" a stream.  The intention of
   resetting a stream is to set the numbering sequence of the stream
   back to 'zero' with a corresponding notification to the application
   layer that the reset has been performed.  Applications requiring this
   feature want it so that they can "reuse" streams for different
   purposes but still utilize the stream sequence number so that the
   application can track the message flows.  Thus, without this feature,
   a new use of an old stream would result in message numbers greater
   than expected, unless there is a protocol mechanism to "reset the
   streams back to zero".  This document also includes methods for
   resetting the transmission sequence numbers, adding additional
   streams, and resetting all stream sequence numbers.

Status of This Memo

   This is an Internet Standards Track document.

   This document is a product of the Internet Engineering Task Force
   (IETF).  It represents the consensus of the IETF community.  It has
   received public review and has been approved for publication by the
   Internet Engineering Steering Group (IESG).  Further information on
   Internet Standards is available in Section 2 of RFC 5741.

   Information about the current status of this document, any errata,
   and how to provide feedback on it may be obtained at
   http://www.rfc-editor.org/info/rfc6525.

Stewart, et al.              Standards Track                    [Page 1]
RFC 6525               SCTP Stream Reconfiguration         February 2012

Copyright Notice

   Copyright (c) 2012 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.

Table of Contents

   1. Introduction ....................................................3
   2. Conventions .....................................................4
   3. New Chunk Type ..................................................4
      3.1. RE-CONFIG Chunk ............................................5
   4. New Parameter Types .............................................6
      4.1. Outgoing SSN Reset Request Parameter .......................7
      4.2. Incoming SSN Reset Request Parameter .......................8
      4.3. SSN/TSN Reset Request Parameter ............................9
      4.4. Re-configuration Response Parameter .......................10
      4.5. Add Outgoing Streams Request Parameter ....................12
      4.6. Add Incoming Streams Request Parameter ....................13
   5. Procedures .....................................................14
      5.1. Sender-Side Procedures ....................................14
           5.1.1. Sender-Side Procedures for the RE-CONFIG Chunk .....14
           5.1.2. Sender-Side Procedures for the Outgoing SSN
                  Reset Request Parameter ............................15
           5.1.3. Sender-Side Procedures for the Incoming SSN
                  Reset Request Parameter ............................16
           5.1.4. Sender-Side Procedures for the SSN/TSN
                  Reset Request Parameter ............................17
           5.1.5. Sender-Side Procedures for the Add Outgoing
                  Streams Request Parameter ..........................17
           5.1.6. Sender-Side Procedures for the Add Incoming
                  Streams Request Parameter ..........................17
           5.1.7. Sender-Side Procedures for the
                  Re-configuration Response Parameter ................18

Stewart, et al.              Standards Track                    [Page 2]
RFC 6525               SCTP Stream Reconfiguration         February 2012

      5.2. Receiver-Side Procedures ..................................18
           5.2.1. Receiver-Side Procedures for the RE-CONFIG Chunk ...18