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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 Use" 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 November 9, 2020. 36 Copyright Notice 38 Copyright (c) 2020 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 . . . . . . . . . . . . . . . . . . . 4 57 5. Acknowledgements . . . . . . . . . . . . . . . . . . . . . . 4 58 6. References . . . . . . . . . . . . . . . . . . . . . . . . . 4 59 6.1. Normative References . . . . . . . . . . . . . . . . . . 5 60 6.2. Informative References . . . . . . . . . . . . . . . . . 5 61 Author's Address . . . . . . . . . . . . . . . . . . . . . . . . 5 63 1. Introduction 65 The Border Gateway Protocol uses a mechanism called "Capability 66 Advertisement" [RFC5492] to enable BGP peers to tell one another 67 about their optional protocol extensions. These so-called 68 "Capabilities" are signaled using code points called "Capability 69 Codes". 71 [RFC5492] designates the range of Capability Codes 128-255 as 72 "Reserved for Private Use". Subsequent experience has shown this to 73 be not only useless, but actively confusing to implementors. 75 Accordingly, this document revises the registration procedures for 76 the range 128-255, as follows, using the terminology defined in 77 [RFC8126]: 79 o 128-238: First Come First Served 80 o 239-254: Experimental Use 81 o 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 Since the range 128-255 was formerly designated Private Use, 102 implementors may have chosen to use code points within that range 103 prior to publication of this document. For this reason, a survey was 104 conducted beginning August 14, 2015 (version 01 of the individual 105 draft) to find any such uses. A number were contributed and were 106 used to seed Table 2. Of course there can be no guarantee that all 107 uses were discovered, however the likelihood seems high that 108 remaining uses, if any, genuinely do fall under the intended use of 109 "Private Use" and are restricted to some special deployment, and are 110 not in wide use. Furthermore, any remaining uses would be no worse 111 than any other code point collision, such as occasionally occurs with 112 code point "squatting", and could be dealt with in the same manner. 114 3. IANA Considerations 116 IANA is requested to revise the "Capability Codes" registry in the 117 "Border Gateway Protocol (BGP) Parameters" group as follows. 119 Reference: [RFC5492] and this document. 121 Registration procedures: 123 +---------+-------------------------+ 124 | Range | Registration Procedures | 125 +---------+-------------------------+ 126 | 1-63 | IETF Review | 127 | 64-238 | First Come First Served | 128 | 239-254 | Experimental | 129 +---------+-------------------------+ 131 Table 1 133 IANA is requested to perform the following new allocations within the 134 "Capability Codes" registry: 136 +-------+----------------------------------+-----------+------------+ 137 | Value | Description | Reference | Change | 138 | | | | Controller | 139 +-------+----------------------------------+-----------+------------+ 140 | 128 | Prestandard Route Refresh | (this | IETF | 141 | | (deprecated) | document) | | 142 +-------+----------------------------------+-----------+------------+ 143 | 129 | Prestandard Outbound Route | (this | IETF | 144 | | Filtering (deprecated), | document) | | 145 | | prestandard Routing Policy | | | 146 | | Distribution (deprecated) | | | 147 +-------+----------------------------------+-----------+------------+ 148 | 130 | Prestandard Outbound Route | (this | IETF | 149 | | Filtering (deprecated) | document) | | 150 +-------+----------------------------------+-----------+------------+ 151 | 131 | Prestandard Multisession | (this | IETF | 152 | | (deprecated) | document) | | 153 +-------+----------------------------------+-----------+------------+ 154 | 184 | Prestandard FQDN (deprecated) | (this | IETF | 155 | | | document) | | 156 +-------+----------------------------------+-----------+------------+ 157 | 185 | Prestandard OPERATIONAL message | (this | IETF | 158 | | (deprecated) | document) | | 159 +-------+----------------------------------+-----------+------------+ 160 | 255 | Reserved | (this | IETF | 161 | | | document) | | 162 +-------+----------------------------------+-----------+------------+ 164 Table 2 166 4. Security Considerations 168 This revision to registration procedures does not change the 169 underlying security issues inherent in the existing [RFC5492] and 170 [RFC4271]. 172 5. Acknowledgements 174 Thanks to Alia Atlas, Bruno Decraene, Martin Djernaes, Jie Dong, Jeff 175 Haas, Sue Hares, Acee Lindem, Thomas Mangin, and Tom Petch for review 176 and comments. 178 6. References 179 6.1. Normative References 181 [RFC5492] Scudder, J. and R. Chandra, "Capabilities Advertisement 182 with BGP-4", RFC 5492, DOI 10.17487/RFC5492, February 183 2009, . 185 [RFC8126] Cotton, M., Leiba, B., and T. Narten, "Guidelines for 186 Writing an IANA Considerations Section in RFCs", BCP 26, 187 RFC 8126, DOI 10.17487/RFC8126, June 2017, 188 . 190 6.2. Informative References 192 [RFC4271] Rekhter, Y., Ed., Li, T., Ed., and S. Hares, Ed., "A 193 Border Gateway Protocol 4 (BGP-4)", RFC 4271, 194 DOI 10.17487/RFC4271, January 2006, 195 . 197 Author's Address 199 John Scudder 200 Juniper Networks 201 1194 N. Mathilda Ave 202 Sunnyvale, CA 94089 203 USA 205 Email: jgs@juniper.net