4over6 Transit Solution Using IP Encapsulation and MP-BGP Extensions
RFC 5747
| Document | Type |
RFC - Experimental
(March 2010; No errata)
Was draft-wu-softwire-4over6 (int)
|
|
|---|---|---|---|
| Authors | Jianping Wu , Chris Metz , Xing Li , Mingwei Xu , Yong Cui | ||
| Last updated | 2015-10-14 | ||
| Stream | ISE | ||
| Formats | plain text html pdf htmlized bibtex | ||
| Stream | ISE state | (None) | |
| Consensus Boilerplate | Unknown | ||
| Document shepherd | No shepherd assigned | ||
| IESG | IESG state | RFC 5747 (Experimental) | |
| Telechat date | |||
| Responsible AD | Ralph Droms | ||
| Send notices to | rfc-ise@rfc-editor.org | ||
Independent Submission J. Wu
Request for Comments: 5747 Y. Cui
Category: Experimental X. Li
ISSN: 2070-1721 M. Xu
Tsinghua University
C. Metz
Cisco Systems, Inc.
March 2010
4over6 Transit Solution Using IP Encapsulation and MP-BGP Extensions
Abstract
The emerging and growing deployment of IPv6 networks will introduce
cases where connectivity with IPv4 networks crossing IPv6 transit
backbones is desired. This document describes a mechanism for
automatic discovery and creation of IPv4-over-IPv6 tunnels via
extensions to multiprotocol BGP. It is targeted at connecting
islands of IPv4 networks across an IPv6-only backbone without the
need for a manually configured overlay of tunnels. The mechanisms
described in this document have been implemented, tested, and
deployed on the large research IPv6 network in China.
Status of This Memo
This document is not an Internet Standards Track specification; it is
published for examination, experimental implementation, and
evaluation.
This document defines an Experimental Protocol for the Internet
community. This is a contribution to the RFC Series, independently
of any other RFC stream. The RFC Editor has chosen to publish this
document at its discretion and makes no statement about its value for
implementation or deployment. Documents approved for publication by
the RFC Editor are not 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/rfc5747.
IESG Note
The mechanisms and techniques described in this document are related
to specifications developed by the IETF softwire working group and
published as Standards Track documents by the IETF, but the
relationship does not prevent publication of this document.
Wu, et al. Experimental [Page 1]
RFC 5747 4over6 March 2010
Copyright Notice
Copyright (c) 2010 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.
Table of Contents
1. Introduction ....................................................3
2. 4over6 Framework Overview .......................................3
3. Prototype Implementation ........................................5
3.1. 4over6 Packet Forwarding ...................................5
3.2. Encapsulation Table ........................................6
3.3. MP-BGP 4over6 Protocol Extensions ..........................7
3.3.1. Receiving Routing Information from Local CE .........8
3.3.2. Receiving 4over6 Routing Information from a
Remote 4over6 PE ....................................8
4. 4over6 Deployment Experience ....................................9
4.1. CNGI-CERNET2 ...............................................9
4.2. 4over6 Testbed on the CNGI-CERNET2 IPv6 Network ............9
4.3. Deployment Experiences ....................................10
5. Ongoing Experiment .............................................11
6. Relationship to Softwire Mesh Effort ...........................12
7. IANA Considerations ............................................12
8. Security Considerations ........................................13
9. Conclusion .....................................................13
10. Acknowledgements ..............................................13
11. Normative References ..........................................14
Wu, et al. Experimental [Page 2]
RFC 5747 4over6 March 2010
1. Introduction
Due to the lack of IPv4 address space, more and more IPv6 networks
have been deployed not only on edge networks but also on backbone
networks. However, there are still a large number of legacy IPv4
hosts and applications. As a result, IPv6 networks and IPv4
applications/hosts will have to coexist for a long period of time.
The emerging and growing deployment of IPv6 networks will introduce
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