PCE Working Group D. Dhody Internet-Draft Huawei Technologies Updates: 5440 (if approved) D. King Intended status: Standards Track Lancaster University Expires: February 24, 2018 A. Farrel Juniper Networks August 23, 2017 Experimental Codepoint Allocation for the Path Computation Element communication Protocol (PCEP) draft-ietf-pce-pcep-exp-codepoints-02 Abstract IANA assigns values to the Path Computation Element (PCE) communication Protocol (PCEP) parameters (messages, objects, TLVs). IANA established a new top-level registry to contain all PCEP codepoints and sub-registries. The allocation policy for each new registry is by IETF Review. This document updates RFC 5440 by changing the allocation policies for these three registries to mark some of the code points as assigned for Experimental Use. 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 24, 2018. Copyright Notice Copyright (c) 2017 IETF Trust and the persons identified as the document authors. All rights reserved. Dhody, et al. Expires February 24, 2018 [Page 1] Internet-Draft EXP-CODEPOINT August 2017 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. This document may contain material from IETF Documents or IETF Contributions published or made publicly available before November 10, 2008. The person(s) controlling the copyright in some of this material may not have granted the IETF Trust the right to allow modifications of such material outside the IETF Standards Process. Without obtaining an adequate license from the person(s) controlling the copyright in such materials, this document may not be modified outside the IETF Standards Process, and derivative works of it may not be created outside the IETF Standards Process, except to format it for publication as an RFC or to translate it into languages other than English. Table of Contents 1. Introduction . . . . . . . . . . . . . . . . . . . . . . . . 2 2. PCEP Messages . . . . . . . . . . . . . . . . . . . . . . . . 3 3. PCEP Objects . . . . . . . . . . . . . . . . . . . . . . . . 3 4. PCEP TLVs . . . . . . . . . . . . . . . . . . . . . . . . . . 3 5. Handling of Unknown Experimentation . . . . . . . . . . . . . 4 6. IANA Considerations . . . . . . . . . . . . . . . . . . . . . 4 6.1. New PCEP Messages . . . . . . . . . . . . . . . . . . . . 4 6.2. New PCEP Objects . . . . . . . . . . . . . . . . . . . . 4 6.3. New PCEP TLVs . . . . . . . . . . . . . . . . . . . . . . 5 7. Security Considerations . . . . . . . . . . . . . . . . . . . 5 8. Acknowledgments . . . . . . . . . . . . . . . . . . . . . . . 5 9. References . . . . . . . . . . . . . . . . . . . . . . . . . 5 9.1. Normative References . . . . . . . . . . . . . . . . . . 5 9.2. Informative References . . . . . . . . . . . . . . . . . 6 Appendix A. Other PCEP Registries . . . . . . . . . . . . . . . 7 Authors' Addresses . . . . . . . . . . . . . . . . . . . . . . . 7 1. Introduction The Path Computation Element communication Protocol (PCEP) provides mechanisms for Path Computation Elements (PCEs) to perform path computations in response to Path Computation Clients (PCCs) requests. Dhody, et al. Expires February 24, 2018 [Page 2] Internet-Draft EXP-CODEPOINT August 2017 Further, in order to support use cases described in [RFC8051], [I-D.ietf-pce-stateful-pce] specifies a set of extensions to PCEP to enable stateful control of MPLS-TE and GMPLS LSPs via PCEP. [I-D.ietf-pce-pce-initiated-lsp] describes the setup, maintenance and teardown of PCE-initiated LSPs under the stateful PCE model. In section 9 of [RFC5440], IANA assigns values to the PCEP protocol parameters (messages, objects, TLVs). IANA established a new top- level registry to contain all PCEP codepoints and sub-registries. The allocation policy for each new registry is by IETF Review as described in [RFC8126]. Also, early allocation [RFC7120] provides some latitude for allocation of these code points, but is reserved for features that are considered appropriately stable. With some recent advancement, there is an enhanced need to experiment with PCEP. It is often necessary to use some sort of number or constant in order to actually test or experiment with the new function, even when testing in a closed environment. In order to run experiments, it is important that the value won't collide not only with existing codepoints but any future allocation. This document updates [RFC5440] by changing the allocation policies for these three registries to mark some of the code points as assigned for Experimental Use. See [RFC3692] for further discussion of the use of experimental codepoints. 2. PCEP Messages PCEP message types are in the range 0 to 255. This document sets aside message types 252-255 for experimentation as described in Section 6.1. 3. PCEP Objects PCEP objects are identified by values in the range 0 to 255. This document sets aside object identifiers 248-255 for experimentation as described in Section 6.2. 4. PCEP TLVs PCEP TLV type codes are in the range 0 to 65535. This document sets aside object identifiers 65504-65535 for experimentation as described in Section 6.2. Dhody, et al. Expires February 24, 2018 [Page 3] Internet-Draft EXP-CODEPOINT August 2017 5. Handling of Unknown Experimentation A PCEP implementation that receives an experimental PCEP message, that it does not recognize, would react as per section 6.9 of [RFC5440] by sending a PCErr message with Error-value=2 (capability not supported). A PCE that does not recognize an experimental PCEP object, will reject the entire PCEP message and send a PCE error message with Error- Type="Unknown Object" or "Not supported object" as described in [RFC5440]. As per section 7.1 of [RFC5440], unknown experimental PCEP TLV would be ignored. 6. IANA Considerations IANA maintains the "Path Computation Element Protocol (PCEP) Numbers" at . 6.1. New PCEP Messages Within this registry IANA maintains a sub-registry for PCEP Messages (see PCEP Messages at ). IANA is requested to change the registration procedure for this registry to read as follows: 0-251 IETF Review 252-255 Experimental Use IANA is also requested to mark the values 252-255 in the registry accordingly. 6.2. New PCEP Objects Within this registry IANA maintains a sub-registry for PCEP Objects (see PCEP Objects at ). IANA is requested to change the registration procedure for this registry to read as follows: 0-247 IETF Review 248-255 Experimental Use IANA is also requested to mark the values 248-255 in the registry accordingly. Dhody, et al. Expires February 24, 2018 [Page 4] Internet-Draft EXP-CODEPOINT August 2017 6.3. New PCEP TLVs Within this registry IANA maintains a sub-registry for PCEP TLVs (see PCEP TLV Type Indicators at ). IANA is requested to change the registration procedure for this registry to read as follows: 0-65503 IETF Review 65504-65535 Experimental Use IANA is also requested to mark the values 65504-65535 in the registry accordingly. 7. Security Considerations This document does not introduce any new security considerations to the existing protocol. Refer to [RFC5440] for further details of the specific security measures. [RFC3692] asserts that the existence of experimental code points introduce no new security considerations. However, implementations accepting experimental codepoints need to take care in how they parse and process the messages, objects, and TLVs in case they come, accidentally from another experiment. 8. Acknowledgments The authors would like to thank Ramon Casellas, Jeff Tantsura, Jonathan Hardwick, Julien Mueric, Lou Berger, Michael Shroff, and Andrew Dolganow for their feedback and suggestions. 9. References 9.1. Normative References [RFC5440] Vasseur, JP., Ed. and JL. Le Roux, Ed., "Path Computation Element (PCE) Communication Protocol (PCEP)", RFC 5440, DOI 10.17487/RFC5440, March 2009, . [RFC8126] Cotton, M., Leiba, B., and T. Narten, "Guidelines for Writing an IANA Considerations Section in RFCs", BCP 26, RFC 8126, DOI 10.17487/RFC8126, June 2017, . Dhody, et al. Expires February 24, 2018 [Page 5] Internet-Draft EXP-CODEPOINT August 2017 9.2. Informative References [RFC3692] Narten, T., "Assigning Experimental and Testing Numbers Considered Useful", BCP 82, RFC 3692, DOI 10.17487/RFC3692, January 2004, . [RFC7120] Cotton, M., "Early IANA Allocation of Standards Track Code Points", BCP 100, RFC 7120, DOI 10.17487/RFC7120, January 2014, . [RFC8051] Zhang, X., Ed. and I. Minei, Ed., "Applicability of a Stateful Path Computation Element (PCE)", RFC 8051, DOI 10.17487/RFC8051, January 2017, . [I-D.ietf-pce-stateful-pce] Crabbe, E., Minei, I., Medved, J., and R. Varga, "PCEP Extensions for Stateful PCE", draft-ietf-pce-stateful- pce-21 (work in progress), June 2017. [I-D.ietf-pce-pce-initiated-lsp] Crabbe, E., Minei, I., Sivabalan, S., and R. Varga, "PCEP Extensions for PCE-initiated LSP Setup in a Stateful PCE Model", draft-ietf-pce-pce-initiated-lsp-10 (work in progress), June 2017. Dhody, et al. Expires February 24, 2018 [Page 6] Internet-Draft EXP-CODEPOINT August 2017 Appendix A. Other PCEP Registries Based on the feedback from the WG, it was decided to focus only on the essentials in the scope of this documents. For others, Experiments can use a new experimental TLV/Object instead. Authors' Addresses Dhruv Dhody Huawei Technologies Divyashree Techno Park, Whitefield Bangalore, Karnataka 560066 India EMail: dhruv.ietf@gmail.com Daniel King Lancaster University UK EMail: d.king@lancaster.ac.uk Adrian Farrel Juniper Networks UK EMail: afarrel@juniper.net Dhody, et al. Expires February 24, 2018 [Page 7]