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rfc:rfc8093

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.

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

Snijders Standards Track [Page 3]

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