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Specifically, the range 15 formerly designated "Reserved for Private Use" is divided into three 16 new ranges, respectively designated as "First Come First Served", 17 "Experimental" and "Reserved". 19 Status of This Memo 21 This Internet-Draft is submitted in full conformance with the 22 provisions of BCP 78 and BCP 79. 24 Internet-Drafts are working documents of the Internet Engineering 25 Task Force (IETF). Note that other groups may also distribute 26 working documents as Internet-Drafts. The list of current Internet- 27 Drafts is at https://datatracker.ietf.org/drafts/current/. 29 Internet-Drafts are draft documents valid for a maximum of six months 30 and may be updated, replaced, or obsoleted by other documents at any 31 time. It is inappropriate to use Internet-Drafts as reference 32 material or to cite them other than as "work in progress." 34 This Internet-Draft will expire on May 10, 2019. 36 Copyright Notice 38 Copyright (c) 2018 IETF Trust and the persons identified as the 39 document authors. All rights reserved. 41 This document is subject to BCP 78 and the IETF Trust's Legal 42 Provisions Relating to IETF Documents 43 (https://trustee.ietf.org/license-info) in effect on the date of 44 publication of this document. Please review these documents 45 carefully, as they describe your rights and restrictions with respect 46 to this document. Code Components extracted from this document must 47 include Simplified BSD License text as described in Section 4.e of 48 the Trust Legal Provisions and are provided without warranty as 49 described in the Simplified BSD License. 51 Table of Contents 53 1. Introduction . . . . . . . . . . . . . . . . . . . . . . . . 2 54 2. Discussion . . . . . . . . . . . . . . . . . . . . . . . . . 2 55 3. IANA Considerations . . . . . . . . . . . . . . . . . . . . . 3 56 4. Security Considerations . . . . . . . . . . . . . . . . . . . 3 57 5. Acknowledgements . . . . . . . . . . . . . . . . . . . . . . 3 58 6. References . . . . . . . . . . . . . . . . . . . . . . . . . 3 59 6.1. Normative References . . . . . . . . . . . . . . . . . . 3 60 6.2. Informative References . . . . . . . . . . . . . . . . . 4 61 Author's Address . . . . . . . . . . . . . . . . . . . . . . . . 4 63 1. Introduction 65 [RFC5492] designates the range of Capability Codes 128-255 as 66 "Reserved for Private Use". Subsequent experience has shown this to 67 be not only useless, but actively confusing to implementors. BGP 68 Capability Codes do not meet the criteria for "Private Use" described 69 in [RFC8126] S. 4.1. An example of a legitimate "private use" code 70 point might be a BGP community [RFC1997] value assigned for use 71 within a given AS, but no analogous use of Capabilities exists. 73 Accordingly, this document revises the registration procedures for 74 the range 128-255, as follows, using the terminology defined in 75 [RFC8126]: 77 128-238: First Come First Served 79 239-254: Experimental Use 81 255: Reserved 83 The procedures for the ranges 1-63 and 64-127 are unchanged, 84 remaining "IETF Review" and "First Come First Served" respectively. 86 2. Discussion 88 The reason for providing an Experimental Use range is to preserve a 89 range for use during early development. Although there are few 90 practical differences between Experimental and Private Use, the 91 change both makes it clear that code points from this space should 92 not be used long-term or in shipping products, and reduces the 93 consumption of the scarce Capability Code space expended for this 94 purpose. Once classified as Experimental, it should be considered 95 difficult to reclassify the space for some other purpose in the 96 future. 98 The reason for reserving the maximum value is that it may be useful 99 in the future if extension of the number space is needed. 101 We note that since the range 128-255 was formerly ungoverned, 102 implementors may have chosen to use code points within that range 103 prior to publication of this document. Although it is not possible 104 to know what code points implementors may have used, experience 105 suggests 128 is a likely value. For that reason, this document asks 106 IANA to reserve that value, to minimize the risk of conflict with 107 existing implementations. 109 Finally, we invite implementors who have used values in the range 110 128-255 to contribute to this draft, so that the values can be 111 included in the registry. 113 3. IANA Considerations 115 IANA is requested to revise the "Capability Codes" registry as 116 described in Section 1. Since the range 128-238 is adjacent to the 117 existing First Come First Served range, after this change the entire 118 First Come First Served range will be 64-238. 120 IANA is requested to allocate value 128 as "Reserved". 122 4. Security Considerations 124 This revision to registration procedures does not change the 125 underlying security issues inherent in the existing [RFC5492] and 126 [RFC4271]. 128 5. Acknowledgements 130 Thanks to Alia Atlas, Bruno Decraene, Jeff Haas, Sue Hares and Thomas 131 Mangin for review and comments. 133 6. References 135 6.1. Normative References 137 [RFC5492] Scudder, J. and R. Chandra, "Capabilities Advertisement 138 with BGP-4", RFC 5492, DOI 10.17487/RFC5492, February 139 2009, . 141 [RFC8126] Cotton, M., Leiba, B., and T. Narten, "Guidelines for 142 Writing an IANA Considerations Section in RFCs", BCP 26, 143 RFC 8126, DOI 10.17487/RFC8126, June 2017, 144 . 146 6.2. Informative References 148 [RFC1997] Chandra, R., Traina, P., and T. Li, "BGP Communities 149 Attribute", RFC 1997, DOI 10.17487/RFC1997, August 1996, 150 . 152 [RFC4271] Rekhter, Y., Ed., Li, T., Ed., and S. Hares, Ed., "A 153 Border Gateway Protocol 4 (BGP-4)", RFC 4271, 154 DOI 10.17487/RFC4271, January 2006, 155 . 157 Author's Address 159 John Scudder 160 Juniper Networks 161 1194 N. Mathilda Ave 162 Sunnyvale, CA 94089 163 USA 165 Email: jgs@juniper.net