IPv6 Enterprise Network Renumbering Scenarios, Considerations, and Methods
RFC 6879
Internet Engineering Task Force (IETF) S. Jiang
Request for Comments: 6879 B. Liu
Category: Informational Huawei Technologies Co., Ltd.
ISSN: 2070-1721 B. Carpenter
University of Auckland
February 2013
IPv6 Enterprise Network Renumbering Scenarios,
Considerations, and Methods
Abstract
This document analyzes events that cause renumbering and describes
the current renumbering methods. These are described in three
categories: those applicable during network design, those applicable
during preparation for renumbering, and those applicable during the
renumbering operation.
Status of This Memo
This document is not an Internet Standards Track specification; it is
published for informational purposes.
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). Not all documents
approved by the IESG are a candidate for any level of Internet
Standard; see 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/rfc6879.
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RFC 6879 IPv6 Enterprise Networks February 2013
Copyright Notice
Copyright (c) 2013 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
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to this document. Code Components extracted from this document must
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the Trust Legal Provisions and are provided without warranty as
described in the Simplified BSD License.
Table of Contents
1. Introduction ....................................................2
2. Enterprise Network Illustration for Renumbering .................3
3. Enterprise Network Renumbering Scenario Categories ..............5
3.1. Renumbering Caused by External Network Factors .............5
3.2. Renumbering Caused by Internal Network Factors .............5
4. Network Renumbering Considerations and Current Methods ..........6
4.1. Considerations and Current Methods during Network Design ...6
4.2. Considerations and Current Methods for the
Preparation of Renumbering ................................10
4.3. Considerations and Current Methods during
Renumbering Operation .....................................11
5. Security Considerations ........................................13
6. Acknowledgements ...............................................14
7. References .....................................................14
7.1. Normative References ......................................14
7.2. Informative References ....................................15
1. Introduction
Site renumbering is difficult. Network managers frequently attempt
to avoid future renumbering by numbering their network resources from
Provider-Independent (PI) address space. However, widespread use of
PI address space would aggravate BGP4 scaling problems [RFC4116] and,
depending on Regional Internet Registry (RIR) policies, PI space is
not always available for enterprises of all sizes. Therefore, it is
desirable to develop mechanisms that simplify IPv6 renumbering for
enterprises.
This document is an analysis of IPv6 site renumbering for enterprise
networks. It undertakes scenario descriptions, including
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RFC 6879 IPv6 Enterprise Networks February 2013
documentation of current capabilities and existing practices. The
reader is assumed to be familiar with [RFC4192] and [RFC5887].
Proposals for new technology and methods are out of scope.
Since IPv4 and IPv6 are logically separate from the perspective of
renumbering, regardless of overlapping of the IPv4/IPv6 networks or
devices, this document focuses on IPv6 only, leaving IPv4 out of
scope. Dual-stack networks or IPv4/IPv6 transition scenarios are out
of scope as well.
This document focuses on enterprise network renumbering; however,
most of the analysis is also applicable to ISP network renumbering.
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