Router Renumbering for IPv6
RFC 2894
|
Document |
Type |
|
RFC - Proposed Standard
(August 2000; No errata)
|
|
Author |
|
Matt Crawford
|
|
Last updated |
|
2013-03-02
|
|
Stream |
|
IETF
|
|
Formats |
|
plain text
html
pdf
htmlized
bibtex
|
Stream |
WG state
|
|
(None)
|
|
Document shepherd |
|
No shepherd assigned
|
IESG |
IESG state |
|
RFC 2894 (Proposed Standard)
|
|
Consensus Boilerplate |
|
Unknown
|
|
Telechat date |
|
|
|
Responsible AD |
|
(None)
|
|
Send notices to |
|
(None)
|
Network Working Group M. Crawford
Request for Comments: 2894 Fermilab
Category: Standards Track August 2000
Router Renumbering for IPv6
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.
Copyright Notice
Copyright (C) The Internet Society (2000). All Rights Reserved.
IESG Note:
This document defines mechanisms for informing a set of routers of
renumbering operations they are to perform, including a mode of
operation in environments in which the exact number of routers is
unknown. Reliably informing all routers when the actual number of
routers is unknown is a difficult problem. Implementation and
operational experience will be needed to fully understand the
applicabilty and scalability aspects of the mechanisms defined in
this document when the number of routers is unknown.
Abstract
IPv6 Neighbor Discovery and Address Autoconfiguration conveniently
make initial assignments of address prefixes to hosts. Aside from
the problem of connection survival across a renumbering event, these
two mechanisms also simplify the reconfiguration of hosts when the
set of valid prefixes changes.
This document defines a mechanism called Router Renumbering ("RR")
which allows address prefixes on routers to be configured and
reconfigured almost as easily as the combination of Neighbor
Discovery and Address Autoconfiguration works for hosts. It provides
a means for a network manager to make updates to the prefixes used by
and advertised by IPv6 routers throughout a site.
Crawford Standards Track [Page 1]
RFC 2894 Router Renumbering for IPv6 August 2000
Table of Contents
1. Functional Overview ....................................... 2
2. Definitions ............................................... 4
2.1. Terminology ......................................... 4
2.2. Requirements ........................................ 5
3. Message Format ............................................ 5
3.1. Router Renumbering Header ........................... 7
3.2. Message Body -- Command Message ..................... 9
3.2.1. Prefix Control Operation ...................... 9
3.2.1.1. Match-Prefix Part ....................... 9
3.2.1.2. Use-Prefix Part ......................... 11
3.3. Message Body -- Result Message ...................... 12
4. Message Processing ........................................ 14
4.1. Header Check ........................................ 14
4.2. Bounds Check ........................................ 15
4.3. Execution ........................................... 16
4.4. Summary of Effects .................................. 17
5. Sequence Number Reset ..................................... 18
6. IANA Considerations ....................................... 19
7. Security Considerations ................................... 19
7.1. Security Policy and Association Database Entries .... 19
8. Implementation and Usage Advice for Reliability ........... 20
8.1. Outline and Definitions ............................. 21
8.2. Computations ........................................ 23
8.3. Additional Assurance Methods ........................ 24
9. Usage Examples ............................................ 25
9.1. Maintaining Global-Scope Prefixes ................... 25
9.2. Renumbering a Subnet ................................ 26
10. Acknowledgments .......................................... 27
11. References ............................................... 28
12. Author's Address ......................................... 29
Appendix -- Derivation of Reliability Estimates ............... 30
Full Copyright Statement ...................................... 32
1. Functional Overview
Router Renumbering Command packets contain a sequence of Prefix
Control Operations (PCOs). Each PCO specifies an operation, a
Match-Prefix, and zero or more Use-Prefixes. A router processes each
PCO in sequence, checking each of its interfaces for an address or
prefix which matches the Match-Prefix. For every interface on which
a match is found, the operation is applied. The operation is one of
ADD, CHANGE, or SET-GLOBAL to instruct the router to respectively add
Show full document text