Network Working Group J. Scudder Internet-Draft Juniper Networks Updates: 5492 (if approved) August 14, 2015 Intended status: Standards Track Expires: February 15, 2016 Revision to Capability Codes Registration Procedures draft-scudder-idr-capabilities-registry-change-01.txt Abstract This document updates RFC 5492 by making a change to the registration procedures for BGP Capability Codes. Specifically, the range formerly designated "Reserved for Private Use" is divided into three new ranges, respectively designated as "First Come First Served", "Experimental" and "Reserved". Status of This Memo This Internet-Draft is submitted in full conformance with the provisions of BCP 78 and BCP 79. Internet-Drafts are working documents of the Internet Engineering Task Force (IETF). Note that other groups may also distribute working documents as Internet-Drafts. The list of current Internet- Drafts is at http://datatracker.ietf.org/drafts/current/. Internet-Drafts are draft documents valid for a maximum of six months and may be updated, replaced, or obsoleted by other documents at any time. It is inappropriate to use Internet-Drafts as reference material or to cite them other than as "work in progress." This Internet-Draft will expire on February 15, 2016. Copyright Notice Copyright (c) 2015 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 Scudder Expires February 15, 2016 [Page 1] Internet-Draft Capability Codes Registration Procedures August 2015 the Trust Legal Provisions and are provided without warranty as described in the Simplified BSD License. Table of Contents 1. Introduction . . . . . . . . . . . . . . . . . . . . . . . . 2 2. Discussion . . . . . . . . . . . . . . . . . . . . . . . . . 2 3. IANA Considerations . . . . . . . . . . . . . . . . . . . . . 3 4. Security Considerations . . . . . . . . . . . . . . . . . . . 3 5. Acknowledgements . . . . . . . . . . . . . . . . . . . . . . 3 6. References . . . . . . . . . . . . . . . . . . . . . . . . . 3 6.1. Normative References . . . . . . . . . . . . . . . . . . 3 6.2. Informative References . . . . . . . . . . . . . . . . . 4 Author's Address . . . . . . . . . . . . . . . . . . . . . . . . 4 1. Introduction [RFC5492] designates the range of Capability Codes 128-255 as "Reserved for Private Use". Subsequent experience has shown this to be not only useless, but actively confusing to implementors. BGP Capability Codes do not meet the criteria for "Reserved for Private Use" described in [RFC5226] S. 4.1. An example of a legitimate "private use" code point might be a BGP community [RFC1997] value assigned for use within a given AS, but no analogous use of Capabilities exists. Accordingly, this document revises the registration procedures for the range 128-255, as follows, using the terminology defined in [RFC5226]: 128-238: First Come First Served 239-254: Experimental Use 255: Reserved The procedures for the ranges 1-63 and 64-127 are unchanged, remaining "IETF Review" and "First Come First Served" respectively. 2. Discussion The reason for providing an Experimental Use range is to preserve a range for use during early development. Although there are few practical differences between Experimental and Private Use, the change both makes it clear that code points from this space should not be used long-term or in shipping products, and reduces the consumption of the scarce Capability Code space expended for this purpose. Once classified as Experimental, it should be considered Scudder Expires February 15, 2016 [Page 2] Internet-Draft Capability Codes Registration Procedures August 2015 difficult to reclassify the space for some other purpose in the future. The reason for reserving the maximum value is that it may be useful in the future if extension of the number space is needed. Finally, we note that since the range 128-255 was formerly ungoverned, implementors may have chosen to use code points within that range prior to publication of this document. Although it is not possible to know what code points implementors may have used, experience suggests 128 is a likely value. For that reason, this document asks IANA to reserve that value, to minimize the risk of conflict with existing implementations. 3. IANA Considerations IANA is requested to revise the "Capability Codes" registry as described in Section 1. Since the range 128-238 is adjacent to the existing First Come First Served range, after this change the entire First Come First Served range will be 64-238. IANA is requested to allocate value 128 as "Reserved". 4. Security Considerations This revision to registration procedures does not change the underlying security issues inherent in the existing [RFC5492] and [RFC4271]. 5. Acknowledgements Thanks to Alia Atlas, Bruno Decraene, Jeff Haas, Sue Hares and Thomas Mangin for review and comments. 6. References 6.1. Normative References [RFC5226] Narten, T. and H. Alvestrand, "Guidelines for Writing an IANA Considerations Section in RFCs", BCP 26, RFC 5226, DOI 10.17487/RFC5226, May 2008, . [RFC5492] Scudder, J. and R. Chandra, "Capabilities Advertisement with BGP-4", RFC 5492, DOI 10.17487/RFC5492, February 2009, . Scudder Expires February 15, 2016 [Page 3] Internet-Draft Capability Codes Registration Procedures August 2015 6.2. Informative References [RFC1997] Chandra, R., Traina, P., and T. Li, "BGP Communities Attribute", RFC 1997, DOI 10.17487/RFC1997, August 1996, . [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, . Author's Address John Scudder Juniper Networks 1194 N. Mathilda Ave Sunnyvale, CA 94089 USA Email: jgs@juniper.net Scudder Expires February 15, 2016 [Page 4]