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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