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Internet Engineering Task Force (IETF)                         W. GeorgeRequest for Comments: 6547                             Time Warner CableObsoletes:3627                                            February 2012Updates:6164Category: InformationalISSN: 2070-1721RFC 3627 to Historic StatusAbstract   This document moves "Use of /127 Prefix Length Between Routers   Considered Harmful" (RFC 3627) to Historic status to reflect the   updated guidance contained in "Using 127-Bit IPv6 Prefixes on Inter-   Router Links" (RFC 6164).  A Standards Track document supersedes an   informational document; therefore, guidance provided inRFC 6164 is   to be followed when the two documents are in conflict.  This document   links the two RFCs so that the IETF's updated guidance on this topic   is clearer.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; seeSection 2 of RFC 5741.   Information about the current status of this document, any errata,   and how to provide feedback on it may be obtained athttp://www.rfc-editor.org/info/rfc6547.George                        Informational                     [Page 1]

RFC 6547RFC 3627 Is Historic             February 2012Copyright Notice   Copyright (c) 2012 IETF Trust and the persons identified as the   document authors.  All rights reserved.   This document is subject toBCP 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.  Code Components extracted from this document must   include Simplified BSD License text as described in Section 4.e of   the Trust Legal Provisions and are provided without warranty as   described in the Simplified BSD License.Table of Contents1.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . . .32.  Security Considerations . . . . . . . . . . . . . . . . . . . .33.  Acknowledgements  . . . . . . . . . . . . . . . . . . . . . . .34.  References  . . . . . . . . . . . . . . . . . . . . . . . . . .44.1.  Normative References  . . . . . . . . . . . . . . . . . . .44.2.  Informative References  . . . . . . . . . . . . . . . . . .41.  Introduction   This document moves "Use of /127 Prefix Length Between Routers   Considered Harmful" [RFC3627] to Historic status in accordance withRFC 2026 [RFC2026].RFC 3627 has been superseded by "Using 127-Bit   IPv6 Prefixes on Inter-Router Links" [RFC6164].  A Standards Track   document supersedes an informational document; therefore, guidance   provided inRFC 6164 is to be followed when the two documents are in   conflict.  This may not have been clear to casual readers who are not   familiar with the differences in IETF document types.  This document   adds the necessary link between the two RFCs so that users referring   toRFC 3627 for guidance will see that it has been obsoleted by   updated guidance on the matter, thus hopefully eliminating any   confusion that may be present.2.  Security Considerations   This document introduces no new security considerations.3.  Acknowledgements   Thanks to Brian Carpenter, Bob Hinden, and Ron Bonica for guidance on   the matter, and to Pekka Savola and Miya Kohno and the other authors   of 6164 for their support.George                        Informational                     [Page 2]

RFC 6547RFC 3627 Is Historic             February 20124.  References4.1.  Normative References   [RFC3627]  Savola, P., "Use of /127 Prefix Length Between Routers              Considered Harmful",RFC 3627, September 2003.   [RFC6164]  Kohno, M., Nitzan, B., Bush, R., Matsuzaki, Y., Colitti,              L., and T. Narten, "Using 127-Bit IPv6 Prefixes on Inter-              Router Links",RFC 6164, April 2011.4.2.  Informative References   [RFC2026]  Bradner, S., "The Internet Standards Process -- Revision              3",BCP 9,RFC 2026, October 1996.Author's Address   Wesley George   Time Warner Cable   13820 Sunrise Valley Drive   Herndon, VA  20171   US   Phone: +1 703-561-2540   EMail: wesley.george@twcable.comGeorge                        Informational                     [Page 3]