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+Internet Engineering Task Force (IETF)                       J. Snijders
+Request for Comments: 8093                                           NTT
+Category: Standards Track                                  February 2017
+ISSN: 2070-1721
+
+
+                   Deprecation of BGP Path Attribute
+                 Values 30, 31, 129, 241, 242, and 243
+
+Abstract
+
+   This document requests IANA to mark BGP path attribute values 30, 31,
+   129, 241, 242, and 243 as "Deprecated".
+
+Status of This Memo
+
+   This is an Internet Standards Track document.
+
+   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).  Further information on
+   Internet Standards is available in Section 2 of RFC 7841.
+
+   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/rfc8093.
+
+Copyright Notice
+
+   Copyright (c) 2017 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.  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.
+
+
+
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+Snijders                     Standards Track                    [Page 1]
+
+RFC 8093       Deprecation of Squatted BGP Path Attributes February 2017
+
+
+Table of Contents
+
+   1.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . .   2
+   2.  IANA Considerations . . . . . . . . . . . . . . . . . . . . .   2
+   3.  Security Considerations . . . . . . . . . . . . . . . . . . .   2
+   4.  Informative References  . . . . . . . . . . . . . . . . . . .   3
+   Acknowledgements  . . . . . . . . . . . . . . . . . . . . . . . .   3
+   Author's Address  . . . . . . . . . . . . . . . . . . . . . . . .   3
+
+1.  Introduction
+
+   It has been discovered that certain BGP Path Attribute values have
+   been used in BGP implementations that have been deployed in the wild
+   while not being assigned by IANA for such usage.  Unregistered usage
+   of BGP Path Attribute values can lead to deployment problems for new
+   technologies.
+
+   The use of these unregistered values was noticed when the BGP Large
+   Communities attribute [RFC8092] was initially assigned value 30 by
+   IANA.  It was subsequently discovered that a widely deployed BGP-4
+   [RFC4271] implementation had released code that used path attribute
+   30 and that applied a "Treat-as-withdraw" [RFC7606] strategy to
+   routes containing a valid Large Community attribute, since it was
+   expecting a different data structure.  Because these routes were
+   dropped, early adopters of Large Communities were unreachable from
+   parts of the Internet.  As a workaround, a new Early IANA Allocation
+   was requested.
+
+   The squatting of values 30, 31, 129, 241, 242, and 243 has been
+   confirmed by the involved vendors or through source code review.
+
+2.  IANA Considerations
+
+   IANA has marked values 30, 31, 129, 241, 242, and 243 as "Deprecated"
+   in the "BGP Path Attributes" subregistry under the "Border Gateway
+   Protocol (BGP) Parameters" registry.  The marking "Deprecated" means
+   "use is not recommended" ([IANA-GUIDELINES]).
+
+3.  Security Considerations
+
+   There are no meaningful security consequences arising from this
+   registry update.
+
+
+
+
+
+
+
+
+
+Snijders                     Standards Track                    [Page 2]
+
+RFC 8093       Deprecation of Squatted BGP Path Attributes February 2017
+
+
+4.  Informative References
+
+   [IANA-GUIDELINES]
+              Cotton, M., Leiba, B., and T. Narten, "Guidelines for
+              Writing an IANA Considerations Section in RFCs", Work in
+              Progress, draft-leiba-cotton-iana-5226bis-18, September
+              2016.
+
+   [RFC4271]  Rekhter, Y., Ed., Li, T., Ed., and S. Hares, Ed., "A
+              Border Gateway Protocol 4 (BGP-4)", RFC 4271,
+              DOI 10.17487/RFC4271, January 2006,
+              <http://www.rfc-editor.org/info/rfc4271>.
+
+   [RFC7606]  Chen, E., Ed., Scudder, J., Ed., Mohapatra, P., and K.
+              Patel, "Revised Error Handling for BGP UPDATE Messages",
+              RFC 7606, DOI 10.17487/RFC7606, August 2015,
+              <http://www.rfc-editor.org/info/rfc7606>.
+
+   [RFC8092]  Heitz, J., Ed., Snijders, J., Ed., Patel, K., Bagdonas,
+              I., and N. Hilliard, "BGP Large Communities Attribute",
+              RFC 8092, DOI 10.17487/RFC8092, February 2017,
+              <http://www.rfc-editor.org/info/rfc8092>.
+
+Acknowledgements
+
+   The author would like to gratefully acknowledge Marlien Vijfhuizen
+   who helped discover the squatting of value 30, and Nick Hilliard for
+   editorial feedback.
+
+Author's Address
+
+   Job Snijders
+   NTT Communications
+   Theodorus Majofskistraat 100
+   Amsterdam  1065 SZ
+   The Netherlands
+
+   Email: job@ntt.net
+
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+Snijders                     Standards Track                    [Page 3]
+