NETCONF Working Group Q. Wu Internet-Draft R. Ranade Intended status: Standards Track Huawei Expires: December 21, 2018 June 19, 2018 Base Notifications for NMDA draft-wu-netconf-base-notification-nmda-01 Abstract The Network Configuration Protocol (NETCONF) provides mechanisms to manipulate configuration datastores. NMDA introduces additional datastores for systems that support more advanced processing chains converting configuration to operational state. However, client applications are not able to be aware of common events pertaining to additional datstores, such as a data validation state change in NETCONF server, that may impact management applications. This document updates [RFC6470] to allow a NETCONF client to receive additional notifications for some common system events pertaining to the Network Management Datastore Architecture (NMDA) defined in [RFC8342]. 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 December 21, 2018. Copyright Notice Copyright (c) 2018 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 Wu & Ranade Expires December 21, 2018 [Page 1] Internet-Draft Base notifications NMDA June 2018 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. Summary of Updates to RFC 6470 . . . . . . . . . . . . . . . 3 3. NETCONF Base Notifications YANG Model extension for NMDA . . 3 3.1. Overview . . . . . . . . . . . . . . . . . . . . . . . . 3 3.2. Definitions . . . . . . . . . . . . . . . . . . . . . . . 5 4. Security Considerations . . . . . . . . . . . . . . . . . . . 8 5. IANA Considerations . . . . . . . . . . . . . . . . . . . . . 8 6. Acknowledgements . . . . . . . . . . . . . . . . . . . . . . 9 7. Contributors . . . . . . . . . . . . . . . . . . . . . . . . 9 8. Normative References . . . . . . . . . . . . . . . . . . . . 9 Authors' Addresses . . . . . . . . . . . . . . . . . . . . . . . 10 1. Introduction The Network Configuration Protocol (NETCONF) [RFC6470] provides mechanisms to manipulate configuration datastores. NMDA introduces additional datastores (e.g., , ) for systems that support more advanced processing chains converting configuration to operational state. However, client applications are not able to be aware of common events pertaining to additional datastores, e.g., there are many background activities that happen during the time that configuration is committed to to the time that the configuration is actually applied to . It is possible that some configuration could not be applied to due to either validation issues, or missing resource etc. There is a need for user to know the validation result of data-store and the reason why the configuration were not applied. This document updates [RFC6470] to allows a NETCONF client to receive additional notifications for some common system events pertaining to the Network Management Datastore Architecture (NMDA) defined in [RFC8342]. These notification are not specific to any network management protocols such as NETCONF and RESTCONF. The solution presented in this document is backwards compatible with [RFC6470]. Wu & Ranade Expires December 21, 2018 [Page 2] Internet-Draft Base notifications NMDA June 2018 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 operational state datastore o running configuration datastore o intended configuration datastore 2. Summary of Updates to RFC 6470 This document is intended to provide an extension of notifications initially defined within [RFC6470], with the development of NMDA architcture and data model. Key relationships between these two documents include: o The existing notifications defined in [RFC6470] are remain unchanged, no additional information is added. o A new event notification is defined in this document to overcome the shortcoming of [RFC6470] for supporting NMDA. 3. NETCONF Base Notifications YANG Model extension for NMDA 3.1. Overview The YANG module in NETCONF Base Notifications [RFC6470] specifies the following 5 event notifications for the 'NETCONF' stream to notify a client application that the NETCONF server state has changed: o netconf-config-change o netconf-capability-change o netconf-session-start o netconf-session-end o netconf-confirmed-commit Wu & Ranade Expires December 21, 2018 [Page 3] Internet-Draft Base notifications NMDA June 2018 These event notifications used within the 'NETCONF' stream are accessible to clients via the subscription mechanism described in [RFC5277]. This document extends the YANG module defined in [RFC6470] to include NMDA specific extension which allows a NETCONF client to receive notifications for additional common system event as follows: nmda-data-validate: Generated when a server with network management protocol support detects that a data validation event has occurred from the time that configuration is committed to to the time that the configuration is actually applied to during management session. Indicates the event and the current state of the data validation. A server MAY report events for non- NETCONF management sessions (such as RESTCONF,gPRC), using the 'session-id' value of zero. These notification messages are accessible to clients via either the subscription mechanism described in [RFC5277] or dynamic subscription mechanism and configured subscription mechanism described in [I- D.ietf-netconf-netconf-event-notifications]. The following are examples of a nmda-data-validation notification message: 2017-06-16T16:30:59.137045+09:00 admin 0 10.251.93.83 start partial-fail intended /ietf-interfaces:interfaces-state intended /ietf-system:system Wu & Ranade Expires December 21, 2018 [Page 4] Internet-Draft Base notifications NMDA June 2018 3.2. Definitions This section presents the YANG module defined in this document. This module imports data types from the 'ietf-netconf' module defined in [RFC6241] and 'ietf-inet-types' module defined in [RFC6021]. file "ietf-nmda-notifications@2018-04-01.yang" module ietf-nmda-notifications { namespace "urn:ietf:params:xml:ns:yang:ietf-nmda-notifications"; prefix nmdan; import ietf-datastores { prefix ds; } import ietf-inet-types { prefix inet; } organization "IETF NETCONF (Network Configuration Protocol) Working Group"; contact "WG Web: WG List: WG Chair: Kent Watsen WG Chair: Mahesh Jethanandani Editor: Qin Wu Editor: Rohit R Ranade "; description "This module defines a YANG data model for use with the NETCONF protocol that allows the NETCONF client to receive additional common NETCONF base event notifications related to NMDA. Copyright (c) 2012 IETF Trust and the persons identified as the document authors. 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 (http://trustee.ietf.org/license-info). This version of this YANG module is part of RFC xxxx; see the RFC itself for full legal notices."; revision 2018-04-01 { description "Initial version."; reference "RFC xxx: NETCONF Base Notifications for NMDA"; Wu & Ranade Expires December 21, 2018 [Page 5] Internet-Draft Base notifications NMDA June 2018 } typedef session-id-or-zero-type { type uint32; description "NETCONF Session Id or Zero to indicate none"; } grouping common-session-parms { description "Common session parameters to identify a management session."; leaf username { type string; mandatory true; description "Name of the user for the session."; } leaf session-id { type session-id-or-zero-type; mandatory true; description "Identifier of the session. A NETCONF session MUST be identified by a non-zero value. A non-NETCONF session MAY be identified by the value zero."; } leaf source-host { type inet:ip-address; description "Address of the remote host for the session."; } } notification nmda-data-validate { description "Generated when a NETCONF server detects that a Data validation event has occurred. Indicates the event and the current state of the data validation procedure in progress."; reference "RFC 8342, Section 5"; uses common-session-parms; leaf validate-event { type enumeration { enum "start" { description "The data validate procedure has started."; } Wu & Ranade Expires December 21, 2018 [Page 6] Internet-Draft Base notifications NMDA June 2018 enum "complete" { description "The data validation procedure has been completed."; } } mandatory true; description "Indicates the event that caused the notification."; } leaf validate-result { when "../validate-event = 'complete'"; type enumeration { enum "fail" { description "The configuration fails to be validated before being applied to , e.g., resources are not available or otherwise not physically present leads to the whole set of are not applied."; } enum "partial-fail" { description "The configuration partially fails to be validated before being applied to ,e.g., resources are not available or otherwise not physically present leads to parts of are not applied"; } enum "success" { description "The configuration is successfully validated before being applied to ."; } } description "Result of validate"; } list fail-validate-target { leaf datastore { type identityref { base ds:datastore; } default "ds:operational"; description "Indicates which datastore has changed or which datastore is target of edit-data operation."; } leaf target { type instance-identifier; description Wu & Ranade Expires December 21, 2018 [Page 7] Internet-Draft Base notifications NMDA June 2018 "Topmost node associated with the configuration change. A server SHOULD set this object to the node within the datastore that is being altered. A server MAY set this object to one of the ancestors of the actual node that was changed, or omit this object, if the exact node is not known."; } description "List for fail validate targets"; } } } 4. Security Considerations The YANG module defined in this memo is designed to be accessed via the NETCONF protocol [RFC6241]. The lowest NETCONF layer is the secure transport layer and the mandatory-to-implement secure transport is SSH, defined in [RFC6242]. Some of the readable data nodes in this YANG module may be considered sensitive or vulnerable in some network environments. It is thus important to control read access (e.g., via get, get-config, or notification) to these data nodes. These are the subtrees and data nodes and their sensitivity/vulnerability: /nmda-data-validate/validate-event: Indicates the specific validate-event state change that occurred. A value of 'complete' probably indicates that data validation procedure has completed. 5. IANA Considerations This document registers one XML namespace URN in the 'IETF XML registry', following the format defined in [RFC3688]: URI: urn:ietf:params:xml:ns:yang:ietf-nmda-notifications Registrant Contact: The IESG. XML: N/A, the requested URI is an XML namespace. This document registers one module name in the 'YANG Module Names' registry, defined in [RFC7950]: name: ietf-nmda-notifications Wu & Ranade Expires December 21, 2018 [Page 8] Internet-Draft Base notifications NMDA June 2018 prefix: ncdn namespace: urn:ietf:params:xml:ns:yang:ietf-nmda-notifications RFC: xxxx 6. Acknowledgements Thanks to Juergen Schoenwaelder, Alex Clemm,Carey Timothy and Andy Berman to review this draft and provide important input to this document. 7. Contributors Xiaojian Ding Huawei 101 Software Avenue, Yuhua District Nanjing, Jiangsu 210012 China Email: dingxiaojian1@huawei.com 8. Normative References [I-D.ietf-netconf-netconf-event-notifications] Voit, E., Clemm, A., Prieto, A., Nilsen-Nygaard, E., and A. Tripathy, "NETCONF Support for Event Notifications", draft-ietf-netconf-netconf-event-notifications-09 (work in progress), May 2018. [I-D.ietf-netconf-yang-push] Clemm, A., Voit, E., Prieto, A., Tripathy, A., Nilsen- Nygaard, E., Bierman, A., and B. Lengyel, "YANG Datastore Subscription", draft-ietf-netconf-yang-push-16 (work in progress), May 2018. [RFC2119] Bradner, S., "Key words for use in RFCs to Indicate Requirement Levels", BCP 14, RFC 2119, DOI 10.17487/RFC2119, March 1997, . [RFC3688] Mealling, M., "The IETF XML Registry", BCP 81, RFC 3688, DOI 10.17487/RFC3688, January 2004, . [RFC5277] Chisholm, S. and H. Trevino, "NETCONF Event Notifications", RFC 5277, DOI 10.17487/RFC5277, July 2008, . Wu & Ranade Expires December 21, 2018 [Page 9] Internet-Draft Base notifications NMDA June 2018 [RFC6020] Bjorklund, M., Ed., "YANG - A Data Modeling Language for the Network Configuration Protocol (NETCONF)", RFC 6020, DOI 10.17487/RFC6020, October 2010, . [RFC6021] Schoenwaelder, J., Ed., "Common YANG Data Types", RFC 6021, DOI 10.17487/RFC6021, October 2010, . [RFC6241] Enns, R., Ed., Bjorklund, M., Ed., Schoenwaelder, J., Ed., and A. Bierman, Ed., "Network Configuration Protocol (NETCONF)", RFC 6241, DOI 10.17487/RFC6241, June 2011, . [RFC6242] Wasserman, M., "Using the NETCONF Protocol over Secure Shell (SSH)", RFC 6242, DOI 10.17487/RFC6242, June 2011, . [RFC6470] Bierman, A., "Network Configuration Protocol (NETCONF) Base Notifications", RFC 6470, DOI 10.17487/RFC6470, February 2012, . [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, . Authors' Addresses Qin Wu Huawei 101 Software Avenue, Yuhua District Nanjing, Jiangsu 210012 China Email: bill.wu@huawei.com Rohit R Ranade Huawei Email: rohitrranade@huawei.com Wu & Ranade Expires December 21, 2018 [Page 10]