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4over6 Transit Solution Using IP Encapsulation and MP-BGP Extensions (RFC5747) Disclosure Number: IPCOM000193861D
Original Publication Date: 2010-Mar-01
Included in the Prior Art Database: 2010-Mar-11
Document File: 30 page(s) / 34K

Publishing Venue

Internet Society Requests For Comment (RFCs)

Related People

J. Wu: AUTHOR [+5]


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.

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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


   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


   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                     ...