NETMOD Working Group Q. Wu Internet-Draft Huawei Intended status: Standards Track B. Lengyel Expires: November 17, 2019 Ericsson Hungary Y. Niu Huawei May 16, 2019 Factory default Setting draft-ietf-netmod-factory-default-00 Abstract This document defines a method to reset a YANG server to its factory- default content. The reset operation may be used e.g. during initial zero-touch configuration or when the existing configuration has major errors, so re-starting the configuration process from scratch is the best option. A new factory-reset RPC is defined. Several methods of documenting the factory-default content are specified. Optionally a new "factory-default" read-only datastore is defined, that contains the data that will be copied over to the running datastore at reset. 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 https://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 November 17, 2019. Wu, et al. Expires November 17, 2019 [Page 1] Internet-Draft Factory Default Setting May 2019 Copyright Notice Copyright (c) 2019 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 (https://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. Table of Contents 1. Introduction . . . . . . . . . . . . . . . . . . . . . . . . 2 1.1. Terminology . . . . . . . . . . . . . . . . . . . . . . . 3 2. Factory-Reset RPC . . . . . . . . . . . . . . . . . . . . . . 4 3. Factory-Default Datastore . . . . . . . . . . . . . . . . . . 4 4. YANG Module . . . . . . . . . . . . . . . . . . . . . . . . . 5 5. IANA Considerations . . . . . . . . . . . . . . . . . . . . . 7 6. Security Considerations . . . . . . . . . . . . . . . . . . . 7 7. Acknowledgements . . . . . . . . . . . . . . . . . . . . . . 8 8. Contributors . . . . . . . . . . . . . . . . . . . . . . . . 8 9. References . . . . . . . . . . . . . . . . . . . . . . . . . 8 9.1. Normative References . . . . . . . . . . . . . . . . . . 8 9.2. Informative References . . . . . . . . . . . . . . . . . 8 Appendix A. Open Issues . . . . . . . . . . . . . . . . . . . . 9 Appendix B. Difference between datastore and datastore . . . . . . . . . . . . . . . . . 9 Appendix C. Changes between revisions . . . . . . . . . . . . . 9 Authors' Addresses . . . . . . . . . . . . . . . . . . . . . . . 10 1. Introduction This document defines a method to reset a YANG server to its factory- default content. The reset operation may be used e.g. during initial zero-touch configuration or when the existing configuration has major errors, so re-starting the configuration process from scratch is the best option. When resetting a datastore all previous configuration settings will be lost and replaced by the factory-default content. A new factory-reset RPC is defined. Several methods of documenting the factory-default content are specified. Wu, et al. Expires November 17, 2019 [Page 2] Internet-Draft Factory Default Setting May 2019 Optionally a new "factory-default" read-only datastore is defined, that contains the data that will be copied over to the ,, datastore at reset. This datastore can also be used in or operations. NETCONF defines the operation that allows resetting the datastore and the operation that copies the content of the datastore into the datastore. However it is not possible to reset the running datastore, to reset the candidate datastore without changing the running datastore or to reset any dynamic datastore. A RESTCONF server MAY implement the above NETCONF operations, but that would still not allow it to reset the running configuration. 1.1. Terminology The key words "MUST", "MUST NOT", "REQUIRED", "SHALL", "SHALL NOT", "SHOULD", "SHOULD NOT", "RECOMMENDED", "NOT RECOMMENDED", "MAY", and "OPTIONAL" in this document are to be interpreted as described in BCP 14 [RFC2119] [RFC8174] when, and only when, they appear in all capitals, as shown here. The following terms are defined in [RFC8342] and are not redefined here: o startup configuration datastore o candiate configuration datastore o running configuration datastore o intended configuration datastore o operational state datastore The following terms are defined in this document as follows: o factory-default datastore: A read-only datastore holding a preconfigured minimal initial configuration that can be used to initialize the configuration of a server. The content of the datastore is usually static, but MAY depend on external factors like available HW. Wu, et al. Expires November 17, 2019 [Page 3] Internet-Draft Factory Default Setting May 2019 2. Factory-Reset RPC A new "factory-reset" RPC is introduced. Upon receiveing the RPC the YANG server resets the content of , and to its factory- default content. Read-only datastores receive their content from other datastores (e.g. gets its content from ). Factory-default content SHALL be specified by one of the following means in order of precedence 1. For the , and datastores as the content of the datastore, if it exists 2. YANG Instance Data [I-D.ietf-netmod-yang-instance-file-format] 3. In some implementation specific manner 4. For dynamic datastores unless otherwise specified the factory- default content is empty. 3. Factory-Default Datastore This document introduces a new datastore resource named 'Factory- Default' that represents a preconfigured minimal initial configuration that can be used to initialize the configuration of a server. o Name: "factory-default" o YANG modules: all o YANG nodes: all "config true" data nodes o Management operations: The content of the datastore is set by the YANG server in an implementation dependent manner. The content can not be changed by management operations via NETCONF, RESTCONF,the CLI etc. unless specialized, dedicated operations are provided. The contents of the datastore can be read using NETCONF, RESTCONF operation. The operation can be used to copy the content of the datastore to a set of another datastores. For operation,it can be used to copy the content of the datastore to another datastore, however the content of the datastore is not propagated automatically to any other datastores. o Origin: This document does not define a new origin identity as it does not interact with datastore. Wu, et al. Expires November 17, 2019 [Page 4] Internet-Draft Factory Default Setting May 2019 o Protocols: RESTCONF, NETCONF and other management protocol. o Defining YANG module: "ietf-factory-default" The datastore content is usually defined by the device vendor. It is usually static, but MAY change e.g. depending on external factors like HW available or during device upgrade. On devices that support non-volatile storage, the contents of MUST persist across restarts 4. YANG Module file "ietf-factory-default.yang" module ietf-factory-default { yang-version 1.1; namespace urn:ietf:params:xml:ns:yang:ietf-factory-default; prefix fdef; import ietf-netconf { prefix nc ; } import ietf-datastores { prefix ds; } organization "IETF NETMOD (Network Modeling) Working Group"; contact "WG Web: WG List: WG Chair: Lou Berger WG Chair: Joel Jaeggli WG Chair: Kent Watsen Editor: Balazs Lengyel Editor: Qin Wu Editor: Ye Niu "; description "This module defines the - factory-reset RPC - factory-default datastore - an extension to the NETCONF operation to allow it to operate on the factory-default datastore. Wu, et al. Expires November 17, 2019 [Page 5] Internet-Draft Factory Default Setting May 2019 It provides functionality to reset a YANG server to its factory-default content. Copyright (c) 2018 IETF Trust and the persons identified as authors of the code. All rights reserved. Redistribution and use in source and binary forms, with or without modification, is permitted pursuant to, and subject to the license terms contained in, the Simplified BSD License set forth in Section 4.c of the IETF Trust's Legal Provisions Relating to IETF Documents (https://trustee.ietf.org/license-info). The key words 'MUST', 'MUST NOT', 'REQUIRED', 'SHALL', 'SHALL NOT', 'SHOULD', 'SHOULD NOT', 'RECOMMENDED', 'MAY', and 'OPTIONAL' in the module text are to be interpreted as described in RFC 2119 (https://tools.ietf.org/html/rfc2119). This version of this YANG module is part of RFC XXXX (https://tools.ietf.org/html/rfcXXXX); see the RFC itself for full legal notices."; revision 2019-05-03 { description "Initial revision."; reference "RFC XXXX: Factory default Setting"; } feature factory-default-as-datastore { description "Indicates that the factory default configuration is also available as a separate datastore"; } rpc factory-reset { description "The YANG server resets the content of , and to its factory default content."; // Do we need an extra parameter that may order a restart of // the YANG-server or the whole system? } identity factory-default { if-feature factory-default-as-datastore; base ds:datastore; description "The read-only datastore contains the configuration that will be copied into e.g. the running datastore by the factory-reset operation if the target is the running datastore."; } Wu, et al. Expires November 17, 2019 [Page 6] Internet-Draft Factory Default Setting May 2019 augment /nc:copy-config/nc:input/nc:source/nc:config-source { if-feature factory-default-as-datastore; description " Allows the copy-config operation to use the factory-default datastore as a source"; leaf factory-default { type empty ; description "The factory-default datastore is the source."; } } } 5. IANA Considerations This document registers one URI in the IETF XML Registry [RFC3688]. The following registration has been made: URI: urn:ietf:params:xml:ns:yang:ietf-factory-default Registrant Contact: The IESG. XML: N/A, the requested URI is an XML namespace. This document registers one YANG module in the YANG Module Names Registry [RFC6020]. The following registration has been made: name: ietf-factory-default namespace: urn:ietf:params:xml:ns:yang:ietf-factory-default prefix: fdef RFC: xxxx 6. Security Considerations The RPC can overwrite important and security sensitive information in one of the other datastores e.g. running, therefore it is important to restrict access to this RPC using the standard access control methods. [RFC8341] The content of the factory-default datastore is usually not security sensitive as it is the same on any device of a certain type. Wu, et al. Expires November 17, 2019 [Page 7] Internet-Draft Factory Default Setting May 2019 7. Acknowledgements Thanks to Juergen Schoenwaelder, Ladislav Lhotka, Alex Campbell,Joe Clark,Robert Wilton, Kent Watsen, Joel Jaeggli,Andy Berman,Susan Hares to review this draft and provide important input to this document. 8. Contributors Rohit R Ranade Huawei Email: rohitrranade@huawei.com 9. References 9.1. Normative References [RFC2119] Bradner, S., "Key words for use in RFCs to Indicate Requirement Levels", BCP 14, RFC 2119, DOI 10.17487/RFC2119, March 1997, . [RFC7950] Bjorklund, M., Ed., "The YANG 1.1 Data Modeling Language", RFC 7950, DOI 10.17487/RFC7950, August 2016, . [RFC8174] Leiba, B., "Ambiguity of Uppercase vs Lowercase in RFC 2119 Key Words", BCP 14, RFC 8174, DOI 10.17487/RFC8174, May 2017, . [RFC8341] Bierman, A. and M. Bjorklund, "Network Configuration Access Control Model", STD 91, RFC 8341, DOI 10.17487/RFC8341, March 2018, . [RFC8342] Bjorklund, M., Schoenwaelder, J., Shafer, P., Watsen, K., and R. Wilton, "Network Management Datastore Architecture (NMDA)", RFC 8342, DOI 10.17487/RFC8342, March 2018, . 9.2. Informative References [I-D.ietf-netconf-zerotouch] Watsen, K., Abrahamsson, M., and I. Farrer, "Secure Zero Touch Provisioning (SZTP)", draft-ietf-netconf- zerotouch-29 (work in progress), January 2019. Wu, et al. Expires November 17, 2019 [Page 8] Internet-Draft Factory Default Setting May 2019 [I-D.ietf-netmod-yang-instance-file-format] Lengyel, B. and B. Claise, "YANG Instance Data File Format", draft-ietf-netmod-yang-instance-file-format-02 (work in progress), February 2019. Appendix A. Open Issues o Do we need an extra parameter that may order a restart of the YANG-server or the whole system? o Do we allow different datastore have different factory default content? No Appendix B. Difference between datastore and datastore When the device first boots up, the content of the and will be identical. The content of can be subsequently changed by using as a target in a operation. The is a read-only datastore and it is usually static as described in earlier sections. Appendix C. Changes between revisions v03 - v00 Change draft name from draft-wu to draft-ietf-netmod-factory- default-00 without content changes. v02 - v03 o Change reset-datastore RPC into factory-reset RPC to allow reset the whole device with factory default content. o Remove target datastore parameter from factory-reset RPC. o Other editorial changes. v01 - v02 o Add copy-config based on Rob's comment. o Reference Update. v3 - v00 - v01 o Changed name from draft-wu-netconf-restconf-factory-restore to draft-wu-netmod-factory-default Wu, et al. Expires November 17, 2019 [Page 9] Internet-Draft Factory Default Setting May 2019 o Removed copy-config ; reset-datastore is enough v02 - v03 o Restructured o Made new datastore optional o Removed Netconf capability o Listed Open issues v01 - v02 o - v00 - v01 o - Authors' Addresses Qin Wu Huawei 101 Software Avenue, Yuhua District Nanjing, Jiangsu 210012 China Email: bill.wu@huawei.com Balazs Lengyel Ericsson Hungary Magyar Tudosok korutja 11 1117 Budapest Hungary Phone: +36-70-330-7909 Email: balazs.lengyel@ericsson.com Ye Niu Huawei Email: niuye@huawei.com Wu, et al. Expires November 17, 2019 [Page 10]