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Stream Control Transmission Protocol (SCTP) Dynamic Address Reconfiguration
RFC 5061

Network Working Group                                         R. Stewart
Request for Comments: 5061                           Cisco Systems, Inc.
Category: Standards Track                                         Q. Xie
                                                          Motorola, Inc.
                                                               M. Tuexen
                                      Univ. of Applied Sciences Muenster
                                                             S. Maruyama
                                                               M. Kozuka
                                                        Kyoto University
                                                          September 2007

              Stream Control Transmission Protocol (SCTP)
                    Dynamic Address Reconfiguration

Status of This Memo

   This document specifies an Internet standards track protocol for the
   Internet community, and requests discussion and suggestions for
   improvements.  Please refer to the current edition of the "Internet
   Official Protocol Standards" (STD 1) for the standardization state
   and status of this protocol.  Distribution of this memo is unlimited.

Abstract

   A local host may have multiple points of attachment to the Internet,
   giving it a degree of fault tolerance from hardware failures.  Stream
   Control Transmission Protocol (SCTP) (RFC 4960) was developed to take
   full advantage of such a multi-homed host to provide a fast failover
   and association survivability in the face of such hardware failures.
   This document describes an extension to SCTP that will allow an SCTP
   stack to dynamically add an IP address to an SCTP association,
   dynamically delete an IP address from an SCTP association, and to
   request to set the primary address the peer will use when sending to
   an endpoint.

Stewart, et al.             Standards Track                     [Page 1]
RFC 5061          SCTP Dynamic Address Reconfiguration    September 2007

Table of Contents

   1.  Introduction . . . . . . . . . . . . . . . . . . . . . . . . .  3
   2.  Conventions  . . . . . . . . . . . . . . . . . . . . . . . . .  3
   3.  Serial Number Arithmetic . . . . . . . . . . . . . . . . . . .  4
   4.  Additional Chunks and Parameters . . . . . . . . . . . . . . .  4
     4.1.  New Chunk Types  . . . . . . . . . . . . . . . . . . . . .  4
       4.1.1.  Address Configuration Change Chunk (ASCONF)  . . . . .  5
       4.1.2.  Address Configuration Acknowledgment Chunk
               (ASCONF-ACK) . . . . . . . . . . . . . . . . . . . . .  6
     4.2.  New Parameter Types  . . . . . . . . . . . . . . . . . . .  7
       4.2.1.  Add IP Address . . . . . . . . . . . . . . . . . . . .  8
       4.2.2.  Delete IP Address  . . . . . . . . . . . . . . . . . .  9
       4.2.3.  Error Cause Indication . . . . . . . . . . . . . . . . 10
       4.2.4.  Set Primary IP Address . . . . . . . . . . . . . . . . 11
       4.2.5.  Success Indication . . . . . . . . . . . . . . . . . . 12
       4.2.6.  Adaptation Layer Indication  . . . . . . . . . . . . . 13
       4.2.7.  Supported Extensions Parameter . . . . . . . . . . . . 13
     4.3.  New Error Causes . . . . . . . . . . . . . . . . . . . . . 14
       4.3.1.  Error Cause: Request to Delete Last Remaining IP
               Address  . . . . . . . . . . . . . . . . . . . . . . . 15
       4.3.2.  Error Cause: Operation Refused Due to Resource
               Shortage . . . . . . . . . . . . . . . . . . . . . . . 15
       4.3.3.  Error Cause: Request to Delete Source IP Address . . . 16
       4.3.4.  Error Cause: Association Aborted Due to Illegal
               ASCONF-ACK . . . . . . . . . . . . . . . . . . . . . . 17
       4.3.5.  Error Cause: Request Refused - No Authorization. . . . 17
   5.  Procedures . . . . . . . . . . . . . . . . . . . . . . . . . . 18
     5.1.  ASCONF Chunk Procedures  . . . . . . . . . . . . . . . . . 18
       5.1.1.  Congestion Control of ASCONF Chunks  . . . . . . . . . 20
     5.2.  Upon Reception of an ASCONF Chunk  . . . . . . . . . . . . 21
     5.3.  General Rules for Address Manipulation . . . . . . . . . . 24
       5.3.1.  A Special Case for OOTB ABORT Chunks . . . . . . . . . 29
       5.3.2.  A Special Case for Changing an Address . . . . . . . . 29
     5.4.  Setting of the Primary Address . . . . . . . . . . . . . . 29
     5.5.  Bundling of Multiple ASCONFs . . . . . . . . . . . . . . . 30
   6.  Security Considerations  . . . . . . . . . . . . . . . . . . . 30
   7.  IANA Considerations  . . . . . . . . . . . . . . . . . . . . . 33
   8.  Acknowledgments  . . . . . . . . . . . . . . . . . . . . . . . 34
   9.  References . . . . . . . . . . . . . . . . . . . . . . . . . . 35
     9.1.  Normative References . . . . . . . . . . . . . . . . . . . 35
     9.2.  Informative References . . . . . . . . . . . . . . . . . . 35

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