Network Working Group T. Graf Internet-Draft Swisscom Intended status: Standards Track B. Claise Expires: 21 July 2025 Huawei A. Huang Feng INSA-Lyon 17 January 2025 Support of Versioning in YANG Notifications Subscription draft-ietf-netconf-yang-notifications-versioning-07 Abstract This document extends the YANG notifications subscription mechanism to specify the YANG module semantic version at the subscription. Then, a new extension with the revision and the semantic version of the YANG push subscription state change notification is proposed. 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 21 July 2025. Copyright Notice Copyright (c) 2025 IETF Trust and the persons identified as the document authors. All rights reserved. Graf, et al. Expires 21 July 2025 [Page 1] Internet-Draft YANG Notifications Versioning January 2025 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 Revised BSD License text as described in Section 4.e of the Trust Legal Provisions and are provided without warranty as described in the Revised BSD License. Table of Contents 1. Introduction . . . . . . . . . . . . . . . . . . . . . . . . 2 1.1. Terminology . . . . . . . . . . . . . . . . . . . . . . . 4 2. Extend the Datastore Selection . . . . . . . . . . . . . . . 4 3. Extend the Subscription State Change Notifications . . . . . 6 4. Discovering "ietf-yang-push-revision" Support . . . . . . . . 8 5. The "ietf-yang-push-revision" Module . . . . . . . . . . . . 10 5.1. Data Model Overview . . . . . . . . . . . . . . . . . . . 10 5.2. YANG Module . . . . . . . . . . . . . . . . . . . . . . . 21 6. IANA Considerations . . . . . . . . . . . . . . . . . . . . . 27 6.1. IETF XML Registry . . . . . . . . . . . . . . . . . . . . 27 6.2. YANG Module Name . . . . . . . . . . . . . . . . . . . . 27 7. Operational Considerations . . . . . . . . . . . . . . . . . 27 8. Implementation Status . . . . . . . . . . . . . . . . . . . . 27 8.1. Huawei VRP . . . . . . . . . . . . . . . . . . . . . . . 27 8.2. 6WIND VSR . . . . . . . . . . . . . . . . . . . . . . . . 28 8.3. Cisco IOS XR . . . . . . . . . . . . . . . . . . . . . . 28 9. Security Considerations . . . . . . . . . . . . . . . . . . . 28 10. Acknowledgements . . . . . . . . . . . . . . . . . . . . . . 28 11. References . . . . . . . . . . . . . . . . . . . . . . . . . 28 11.1. Normative References . . . . . . . . . . . . . . . . . . 28 11.2. Informative References . . . . . . . . . . . . . . . . . 29 Authors' Addresses . . . . . . . . . . . . . . . . . . . . . . . 31 1. Introduction In order to process the newly received YANG push notification messages described in section 3.7 of [RFC8641] without querying the Publisher IETF-YANG-LIBRARY each time to understand whether the YANG module(s) semantic has changed at the YANG push receiver, a semantic reference to the YANG module and the XPath or subtree is needed to determine the data types for each field and which part of the YANG module the metrics are expose from. This specification applies to the YANG push configured subscriptions defined in Section 2.5 of [RFC8639], where a publisher is configured to stream notification out of band, as opposed to dynamic subscriptions defined in Section 2.4 of [RFC8639], where the Graf, et al. Expires 21 July 2025 [Page 2] Internet-Draft YANG Notifications Versioning January 2025 subscriber can initiate and modify the subscription dynamically in- band. In the latter case, the subscriber knows already all the subscriber YANG-related information, which it has to know in order to configure the subscription. This semantic reference is available when the subscription is established as described in Section 3.6 of [RFC8641] and being streamed from the publisher to receiver with the subscription state change notifications described in Section 2.7 of [RFC8639] where for each subscription a locally unique subscription ID described in Section 4.3.2 of [RFC8641] is being issued and streamed as metadata with the notification message in the YANG push message header. The semantics can change between different YANG module revisions. The YANG module version statement is specified in Section 7.1.2 of [RFC6020] and states that the newer revision needs to be backward compatible to the previous revision. Section 3.1 of [I-D.ietf-netmod-yang-module-versioning] specifies that newer semantic versions introduced in [I-D.ietf-netmod-yang-semver] MAY not be backward compatible to the previous version when indicated with non-backwards-compatible keyword. The YANG notifications subscription mechanism defined in [RFC8641] does not allow to specify the YANG module revision. When a network node is upgraded, the subscribed YANG module revision MAY have updated and might, consequently, break the data processing pipeline since the YANG push receiver may not be aware of this change. This documents extends the current YANG notifications subscription mechanism to allow to subscribe to a specific revision or latest YANG module semantic version to which the YANG module version needs to be backward compatible to. The subscription state change "subscription-started" and "subscription-modified" notification messages are also extended to include the YANG module revision, revision-label, and YANG library content-id. Changes in the revision and revision-label fields allow a YANG-Push receiver to detect whenever the subscribed YANG module has changed. Changes in the yang-library-content-id that YANG module(s) on the network management server of the YANG-Push publisher has/have changed. Graf, et al. Expires 21 July 2025 [Page 3] Internet-Draft YANG Notifications Versioning January 2025 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 terms "YANG library" and "YANG library content identifier" are used as defined in [RFC8525]. 2. Extend the Datastore Selection The YANG notifications subscription OPTIONALLY can be restricted to the following YANG module revision for future capabilities: module: Restricts the subscription to one or more YANG module names with revision and revision-label together for the related streamed content. revision: Restricts the subscription to a specific YANG module revision. Example: "2014-05-08". revision-label: Restricts the subscription to the latest compatible YANG module semantic version referenced to. Example: "2.0.0". When the NETCONF client creates or modifies the subscription using the RPCs establish-subscription and modify-subscription and the NETCONF server does not support the revision, the revision-label or the combination of revision and revision-label specified in the RPC request, the NETCONF server MUST return an RPC reply including an element as defined in Section 4.3 of [RFC6241] with the error information populated as follows: * an "error-type" node of "application". * an "error-tag" node whose value is a string that corresponds to an identity associated with the error. Graf, et al. Expires 21 July 2025 [Page 4] Internet-Draft YANG Notifications Versioning January 2025 +==========================================+==================+ | Error identity | Uses "error-tag" | +==========================================+==================+ | revision-unsupported | invalid-value | +------------------------------------------+------------------+ | revision-label-unsupported | invalid-value | +------------------------------------------+------------------+ | incompatible-revision-and-revision-label | invalid-value | +------------------------------------------+------------------+ Table 1: General Subscription Error Identities and Associated "error-tag" Use Figure 1 provides an example of a "establish-subscription" RPC call with YANG revision and datastore-xpath-filter for periodical subscription. Figure 2 shows the response when the RPC has been accepted by the NETCONF server and Figure 3 the error sent by the NETCONF server when the revision is not supported. xmlns:ypr="urn:ietf:params:xml:ns:yang:ietf-yang-push-revision"> ds:operational /ex:foo ex:foo 2023-09-17 500 Figure 1: RPC Example for an establish-subscription Graf, et al. Expires 21 July 2025 [Page 5] Internet-Draft YANG Notifications Versioning January 2025 52 Figure 2: RPC Example for a positive establish-subscription response application operation-failed error ypr:revision-unsupported Figure 3: RPC Example for an error establish-subscription response 3. Extend the Subscription State Change Notifications Besides the Subscription ID and the xpath or sub-tree filter reference as described in Section 2.7 of [RFC8639], the following metadata objects are part of a "subscription-started" or "subscription-modified" subscription state change notification. module: Describes the YANG module names for the related streamed content. revision: Describes the YANG module revision as specified in Section 7.1.9 of [RFC6020] for the related streamed content. revision-label: Describes the YANG module semantic version as specified in [I-D.ietf-netmod-yang-semver] for the related streamed content. yang-library-content-id: Contains the YANG library content Graf, et al. Expires 21 July 2025 [Page 6] Internet-Draft YANG Notifications Versioning January 2025 identifier [RFC8525] which is an implementation-specific identifier representing the current information in the YANG library on a specific server. Figure 4 provides an example of a "subscription-modified" subscription state change notification message with the YANG module name, revision, revision label and datastore-xpath-filter for tracking the operational status of a single Ethernet interface (per [RFC8343]). This subscription state change notification message is encoded XML [W3C.REC-xml-20081126] over the Network Configuration Protocol (NETCONF) as per [RFC8640]. 2023-01-03T10:00:00Z 101 /int:interfaces NETCONF ietf-interfaces 2018-02-20 2.0.0 1 Figure 4: XML Push Example for a subscription-modified notification message Figure 5 provides an example of a JSON encoded, [RFC8259], subscription state change notification message over HTTPS-based [I-D.ietf-netconf-https-notif] or UDP-based [I-D.ietf-netconf-udp-notif] transport for the same subscription. Graf, et al. Expires 21 July 2025 [Page 7] Internet-Draft YANG Notifications Versioning January 2025 { "ietf-restconf:notification" : { "eventTime": "2023-01-03T10:00:00Z", "ietf-subscribed-notifications:subscription-modified": { "id": 101, "stream-xpath-filter": "/ietf-interfaces:interfaces", "stream": "NETCONF", "ietf-yang-push-revision:module-version": [{ "module-name": "ietf-interfaces" "revision": "2018-02-20", "revision-label": "2.0.0", "yang-library-content-id": "1", }], } } } Figure 5: JSON Push Example for a subscription-modified notification message 4. Discovering "ietf-yang-push-revision" Support A client can discover the support of 'ietf-yang-push-revision'model through the capabilities model defined in [RFC9196]. This documents extends the 'ietf-notification-capabilities' model with: * A leaf 'yang-push-module-revision-supported', stating that the YANG-Push subscription state change notifications are extended with revision, revision-label and yang-library-content-id extensions. The YANG models defined in Section 5.2 augments the 'ietf- notification-capabilities' model with the leaf listed above. Graf, et al. Expires 21 July 2025 [Page 8] Internet-Draft YANG Notifications Versioning January 2025 module: ietf-system-capabilities +--ro system-capabilities +--ro datastore-capabilities* [datastore] | +--ro datastore | | -> /yanglib:yang-library/datastore/name | +--ro per-node-capabilities* [] | +--ro (node-selection)? | | +--:(node-selector) | | +--ro node-selector? | | nacm:node-instance-identifier | +--ro notc:subscription-capabilities | +--ro notc:max-nodes-per-update? uint32 | +--ro notc:periodic-notifications-supported? | | notification-support | +--ro (notc:update-period)? | | +--:(notc:minimum-update-period) | | | +--ro notc:minimum-update-period? uint32 | | +--:(notc:supported-update-period) | | +--ro notc:supported-update-period* uint32 | +--ro notc:on-change-supported? | | notification-support {yp:on-change}? | +--ro notc:minimum-dampening-period? uint32 | | {yp:on-change}? | +--ro notc:supported-excluded-change-type* union | {yp:on-change}? +--ro notc:subscription-capabilities +--ro notc:max-nodes-per-update? uint32 +--ro notc:periodic-notifications-supported? | notification-support +--ro (notc:update-period)? | +--:(notc:minimum-update-period) | | +--ro notc:minimum-update-period? uint32 | +--:(notc:supported-update-period) | +--ro notc:supported-update-period* uint32 +--ro notc:on-change-supported? | notification-support {yp:on-change}? +--ro notc:minimum-dampening-period? uint32 | {yp:on-change}? +--ro notc:supported-excluded-change-type* union | {yp:on-change}? +--ro ypr:yang-push-module-revision-supported? boolean {yang-push-revision-supported}? This model can be retrieved via a NETCONF RPC. Graf, et al. Expires 21 July 2025 [Page 9] Internet-Draft YANG Notifications Versioning January 2025 5. The "ietf-yang-push-revision" Module 5.1. Data Model Overview This YANG module augments the "ietf-yang-push" module with the module-name, revision, revision-label and yang-library-content-id in the "subscription-started" and "subscription-modified" subscription state change notifications and the ability to define the "revision" and "revision-label" in the "establish-subscription" and "modify- subscription" RPCs in the datastore push subscription. 5.1.1. Tree View The following is the YANG tree diagram [RFC8340] for the ietf-yang- push-revision YANG module Graf, et al. Expires 21 July 2025 [Page 10] Internet-Draft YANG Notifications Versioning January 2025 module: ietf-yang-push-revision augment /sn:establish-subscription/sn:input: +---w module-version-config* [module-name] {yang-push-revision-supported}? +---w module-name yang:yang-identifier +---w revision? rev:revision-date +---w revision-label? ysver:version augment /sn:modify-subscription/sn:input: +---w module-version-config* [module-name] {yang-push-revision-supported}? +---w module-name yang:yang-identifier +---w revision? rev:revision-date +---w revision-label? ysver:version augment /sn:subscription-started: +--ro module-version* [module-name] | {yang-push-revision-supported}? | +--ro module-name yang:yang-identifier | +--ro revision rev:revision-date | +--ro revision-label? ysver:version +--ro yang-library-content-id? -> /yanglib:yang-library/content-id {yang-push-revision-supported}? augment /sn:subscription-modified: +--ro module-version* [module-name] | {yang-push-revision-supported}? | +--ro module-name yang:yang-identifier | +--ro revision rev:revision-date | +--ro revision-label? ysver:version +--ro yang-library-content-id? -> /yanglib:yang-library/content-id {yang-push-revision-supported}? augment /sn:subscriptions/sn:subscription: +--rw module-version-config* [module-name] {yang-push-revision-supported}? +--rw module-name yang:yang-identifier +--rw revision? rev:revision-date +--rw revision-label? ysver:version augment /sysc:system-capabilities/notc:subscription-capabilities: +--ro yang-push-module-revision-supported? boolean {yang-push-revision-supported}? 5.1.2. Full Tree View The following is the YANG tree diagram [RFC8340] for the ietf-yang- push-revision augmentation within the ietf-subscribed-notifications, including the RPCs and notifications. Graf, et al. Expires 21 July 2025 [Page 11] Internet-Draft YANG Notifications Versioning January 2025 module: ietf-yang-push rpcs: +---x resync-subscription {on-change}? +---w input +---w id sn:subscription-id notifications: +---n push-update | +--ro id? sn:subscription-id | +--ro datastore-contents? | +--ro incomplete-update? empty +---n push-change-update {on-change}? +--ro id? sn:subscription-id +--ro datastore-changes | +--ro yang-patch | +--ro patch-id string | +--ro comment? string | +--ro edit* [edit-id] | +--ro edit-id string | +--ro operation enumeration | +--ro target target-resource-offset | +--ro point? target-resource-offset | +--ro where? enumeration | +--ro value? +--ro incomplete-update? empty module: ietf-subscribed-notifications +--ro streams | +--ro stream* [name] | +--ro name string | +--ro description? string | +--ro replay-support? empty {replay}? | +--ro replay-log-creation-time yang:date-and-time {replay}? | +--ro replay-log-aged-time? yang:date-and-time {replay}? +--rw filters | +--rw stream-filter* [name] | | +--rw name string | | +--rw (filter-spec)? | | +--:(stream-subtree-filter) | | | +--rw stream-subtree-filter? {subtree}? | | +--:(stream-xpath-filter) | | +--rw stream-xpath-filter? yang:xpath1.0 {xpath}? | +--rw yp:selection-filter* [filter-id] | +--rw yp:filter-id string | +--rw (yp:filter-spec)? | +--:(yp:datastore-subtree-filter) | | +--rw yp:datastore-subtree-filter? Graf, et al. Expires 21 July 2025 [Page 12] Internet-Draft YANG Notifications Versioning January 2025 | | {sn:subtree}? | +--:(yp:datastore-xpath-filter) | +--rw yp:datastore-xpath-filter? yang:xpath1.0 | {sn:xpath}? +--rw subscriptions +--rw subscription* [id] +--rw id | subscription-id +--rw (target) | +--:(stream) | | +--rw (stream-filter)? | | | +--:(by-reference) | | | | +--rw stream-filter-name | | | | stream-filter-ref | | | +--:(within-subscription) | | | +--rw (filter-spec)? | | | +--:(stream-subtree-filter) | | | | +--rw stream-subtree-filter? | | | | {subtree}? | | | +--:(stream-xpath-filter) | | | +--rw stream-xpath-filter? | | | yang:xpath1.0 {xpath}? | | +--rw stream | | | stream-ref | | +--ro replay-start-time? | | | yang:date-and-time {replay}? | | +--rw configured-replay? empty | | {configured,replay}? | +--:(yp:datastore) | +--rw yp:datastore | | identityref | +--rw (yp:selection-filter)? | +--:(yp:by-reference) | | +--rw yp:selection-filter-ref | | selection-filter-ref | +--:(yp:within-subscription) | +--rw (yp:filter-spec)? | +--:(yp:datastore-subtree-filter) | | +--rw yp:datastore-subtree-filter? | | {sn:subtree}? | +--:(yp:datastore-xpath-filter) | +--rw yp:datastore-xpath-filter? | yang:xpath1.0 {sn:xpath}? +--rw stop-time? | yang:date-and-time +--rw dscp? | inet:dscp {dscp}? +--rw weighting? uint8 Graf, et al. Expires 21 July 2025 [Page 13] Internet-Draft YANG Notifications Versioning January 2025 | {qos}? +--rw dependency? | subscription-id {qos}? +--rw transport? | transport {configured}? +--rw encoding? | encoding +--rw purpose? string | {configured}? +--rw (notification-message-origin)? {configured}? | +--:(interface-originated) | | +--rw source-interface? | | if:interface-ref {interface-designation}? | +--:(address-originated) | +--rw source-vrf? | | -> /ni:network-instances/network-instance/name | | {supports-vrf}? | +--rw source-address? | inet:ip-address-no-zone +--ro configured-subscription-state? | enumeration {configured}? +--rw receivers | +--rw receiver* [name] | +--rw name string | +--ro sent-event-records? | | yang:zero-based-counter64 | +--ro excluded-event-records? | | yang:zero-based-counter64 | +--ro state enumeration | +---x reset {configured}? | +--ro output | +--ro time yang:date-and-time +--rw ypr:module-version-config* [module-name] | {yang-push-revision-supported}? | +--rw ypr:module-name yang:yang-identifier | +--rw ypr:revision? rev:revision-date | +--rw ypr:revision-label? ysver:version +--rw (yp:update-trigger)? +--:(yp:periodic) | +--rw yp:periodic! | +--rw yp:period centiseconds | +--rw yp:anchor-time? yang:date-and-time +--:(yp:on-change) {on-change}? +--rw yp:on-change! +--rw yp:dampening-period? centiseconds +--rw yp:sync-on-start? boolean +--rw yp:excluded-change* change-type Graf, et al. Expires 21 July 2025 [Page 14] Internet-Draft YANG Notifications Versioning January 2025 rpcs: +---x establish-subscription | +---w input | | +---w (target) | | | +--:(stream) | | | | +---w (stream-filter)? | | | | | +--:(by-reference) | | | | | | +---w stream-filter-name | | | | | | stream-filter-ref | | | | | +--:(within-subscription) | | | | | +---w (filter-spec)? | | | | | +--:(stream-subtree-filter) | | | | | | +---w stream-subtree-filter? | | | | | | {subtree}? | | | | | +--:(stream-xpath-filter) | | | | | +---w stream-xpath-filter? | | | | | yang:xpath1.0 {xpath}? | | | | +---w stream | | | | | stream-ref | | | | +---w replay-start-time? | | | | yang:date-and-time {replay}? | | | +--:(yp:datastore) | | | +---w yp:datastore | | | | identityref | | | +---w (yp:selection-filter)? | | | +--:(yp:by-reference) | | | | +---w yp:selection-filter-ref | | | | selection-filter-ref | | | +--:(yp:within-subscription) | | | +---w (yp:filter-spec)? | | | +--:(yp:datastore-subtree-filter) | | | | +---w yp:datastore-subtree-filter? | | | | {sn:subtree}? | | | +--:(yp:datastore-xpath-filter) | | | +---w yp:datastore-xpath-filter? | | | yang:xpath1.0 {sn:xpath}? | | +---w stop-time? | | | yang:date-and-time | | +---w dscp? | | | inet:dscp {dscp}? | | +---w weighting? uint8 | | | {qos}? | | +---w dependency? | | | subscription-id {qos}? | | +---w encoding? | | | encoding | | +---w ypr:module-version-config* [module-name] | | | {yang-push-revision-supported}? Graf, et al. Expires 21 July 2025 [Page 15] Internet-Draft YANG Notifications Versioning January 2025 | | | +---w ypr:module-name yang:yang-identifier | | | +---w ypr:revision? rev:revision-date | | | +---w ypr:revision-label? ysver:version | | +---w (yp:update-trigger)? | | +--:(yp:periodic) | | | +---w yp:periodic! | | | +---w yp:period centiseconds | | | +---w yp:anchor-time? yang:date-and-time | | +--:(yp:on-change) {on-change}? | | +---w yp:on-change! | | +---w yp:dampening-period? centiseconds | | +---w yp:sync-on-start? boolean | | +---w yp:excluded-change* change-type | +--ro output | +--ro id subscription-id | +--ro replay-start-time-revision? yang:date-and-time | {replay}? +---x modify-subscription | +---w input | +---w id | | subscription-id | +---w (target) | | +--:(stream) | | | +---w (stream-filter)? | | | +--:(by-reference) | | | | +---w stream-filter-name | | | | stream-filter-ref | | | +--:(within-subscription) | | | +---w (filter-spec)? | | | +--:(stream-subtree-filter) | | | | +---w stream-subtree-filter? | | | | {subtree}? | | | +--:(stream-xpath-filter) | | | +---w stream-xpath-filter? | | | yang:xpath1.0 {xpath}? | | +--:(yp:datastore) | | +---w yp:datastore | | | identityref | | +---w (yp:selection-filter)? | | +--:(yp:by-reference) | | | +---w yp:selection-filter-ref | | | selection-filter-ref | | +--:(yp:within-subscription) | | +---w (yp:filter-spec)? | | +--:(yp:datastore-subtree-filter) | | | +---w yp:datastore-subtree-filter? | | | {sn:subtree}? | | +--:(yp:datastore-xpath-filter) Graf, et al. Expires 21 July 2025 [Page 16] Internet-Draft YANG Notifications Versioning January 2025 | | +---w yp:datastore-xpath-filter? | | yang:xpath1.0 {sn:xpath}? | +---w stop-time? | | yang:date-and-time | +---w ypr:module-version-config* [module-name] | | {yang-push-revision-supported}? | | +---w ypr:module-name yang:yang-identifier | | +---w ypr:revision? rev:revision-date | | +---w ypr:revision-label? ysver:version | +---w (yp:update-trigger)? | +--:(yp:periodic) | | +---w yp:periodic! | | +---w yp:period centiseconds | | +---w yp:anchor-time? yang:date-and-time | +--:(yp:on-change) {on-change}? | +---w yp:on-change! | +---w yp:dampening-period? centiseconds +---x delete-subscription | +---w input | +---w id subscription-id +---x kill-subscription +---w input +---w id subscription-id notifications: +---n replay-completed {replay}? | +--ro id subscription-id +---n subscription-completed {configured}? | +--ro id subscription-id +---n subscription-modified | +--ro id | | subscription-id | +--ro (target) | | +--:(stream) | | | +--ro (stream-filter)? | | | | +--:(by-reference) | | | | | +--ro stream-filter-name | | | | | stream-filter-ref | | | | +--:(within-subscription) | | | | +--ro (filter-spec)? | | | | +--:(stream-subtree-filter) | | | | | +--ro stream-subtree-filter? | | | | | {subtree}? | | | | +--:(stream-xpath-filter) | | | | +--ro stream-xpath-filter? | | | | yang:xpath1.0 {xpath}? | | | +--ro stream | | | | stream-ref Graf, et al. Expires 21 July 2025 [Page 17] Internet-Draft YANG Notifications Versioning January 2025 | | | +--ro replay-start-time? | | | yang:date-and-time {replay}? | | +--:(yp:datastore) | | +--ro yp:datastore | | | identityref | | +--ro (yp:selection-filter)? | | +--:(yp:by-reference) | | | +--ro yp:selection-filter-ref | | | selection-filter-ref | | +--:(yp:within-subscription) | | +--ro (yp:filter-spec)? | | +--:(yp:datastore-subtree-filter) | | | +--ro yp:datastore-subtree-filter? | | | {sn:subtree}? | | +--:(yp:datastore-xpath-filter) | | +--ro yp:datastore-xpath-filter? | | yang:xpath1.0 {sn:xpath}? | +--ro stop-time? | | yang:date-and-time | +--ro dscp? | | inet:dscp {dscp}? | +--ro weighting? uint8 | | {qos}? | +--ro dependency? | | subscription-id {qos}? | +--ro transport? | | transport {configured}? | +--ro encoding? encoding | +--ro purpose? string | | {configured}? | +--ro ypr:module-version* [module-name] | | {yang-push-revision-supported}? | | +--ro ypr:module-name yang:yang-identifier | | +--ro ypr:revision rev:revision-date | | +--ro ypr:revision-label? ysver:version | +--ro (yp:update-trigger)? | +--:(yp:periodic) | | +--ro yp:periodic! | | +--ro yp:period centiseconds | | +--ro yp:anchor-time? yang:date-and-time | +--:(yp:on-change) {on-change}? | +--ro yp:on-change! | +--ro yp:dampening-period? centiseconds | +--ro yp:sync-on-start? boolean | +--ro yp:excluded-change* change-type +---n subscription-resumed | +--ro id subscription-id +---n subscription-started {configured}? Graf, et al. Expires 21 July 2025 [Page 18] Internet-Draft YANG Notifications Versioning January 2025 | +--ro id | | subscription-id | +--ro (target) | | +--:(stream) | | | +--ro (stream-filter)? | | | | +--:(by-reference) | | | | | +--ro stream-filter-name | | | | | stream-filter-ref | | | | +--:(within-subscription) | | | | +--ro (filter-spec)? | | | | +--:(stream-subtree-filter) | | | | | +--ro stream-subtree-filter? | | | | | {subtree}? | | | | +--:(stream-xpath-filter) | | | | +--ro stream-xpath-filter? | | | | yang:xpath1.0 {xpath}? | | | +--ro stream | | | | stream-ref | | | +--ro replay-start-time? | | | | yang:date-and-time {replay}? | | | +--ro replay-previous-event-time? | | | yang:date-and-time {replay}? | | +--:(yp:datastore) | | +--ro yp:datastore | | | identityref | | +--ro (yp:selection-filter)? | | +--:(yp:by-reference) | | | +--ro yp:selection-filter-ref | | | selection-filter-ref | | +--:(yp:within-subscription) | | +--ro (yp:filter-spec)? | | +--:(yp:datastore-subtree-filter) | | | +--ro yp:datastore-subtree-filter? | | | {sn:subtree}? | | +--:(yp:datastore-xpath-filter) | | +--ro yp:datastore-xpath-filter? | | yang:xpath1.0 {sn:xpath}? | +--ro stop-time? | | yang:date-and-time | +--ro dscp? | | inet:dscp {dscp}? | +--ro weighting? uint8 | | {qos}? | +--ro dependency? | | subscription-id {qos}? | +--ro transport? | | transport {configured}? | +--ro encoding? encoding Graf, et al. Expires 21 July 2025 [Page 19] Internet-Draft YANG Notifications Versioning January 2025 | +--ro purpose? string | | {configured}? | +--ro ypr:module-version* [module-name] | | {yang-push-revision-supported}? | | +--ro ypr:module-name yang:yang-identifier | | +--ro ypr:revision rev:revision-date | | +--ro ypr:revision-label? ysver:version | +--ro (yp:update-trigger)? | +--:(yp:periodic) | | +--ro yp:periodic! | | +--ro yp:period centiseconds | | +--ro yp:anchor-time? yang:date-and-time | +--:(yp:on-change) {on-change}? | +--ro yp:on-change! | +--ro yp:dampening-period? centiseconds | +--ro yp:sync-on-start? boolean | +--ro yp:excluded-change* change-type +---n subscription-suspended | +--ro id subscription-id | +--ro reason identityref +---n subscription-terminated +--ro id subscription-id +--ro reason identityref module: ietf-system-capabilities +--ro system-capabilities +--ro datastore-capabilities* [datastore] | +--ro datastore | | -> /yanglib:yang-library/datastore/name | +--ro per-node-capabilities* [] | +--ro (node-selection)? | | +--:(node-selector) | | +--ro node-selector? | | nacm:node-instance-identifier | +--ro notc:subscription-capabilities | +--ro notc:max-nodes-per-update? uint32 | +--ro notc:periodic-notifications-supported? | | notification-support | +--ro (notc:update-period)? | | +--:(notc:minimum-update-period) | | | +--ro notc:minimum-update-period? uint32 | | +--:(notc:supported-update-period) | | +--ro notc:supported-update-period* uint32 | +--ro notc:on-change-supported? | | notification-support {yp:on-change}? | +--ro notc:minimum-dampening-period? uint32 | | {yp:on-change}? | +--ro notc:supported-excluded-change-type* union Graf, et al. Expires 21 July 2025 [Page 20] Internet-Draft YANG Notifications Versioning January 2025 | {yp:on-change}? +--ro notc:subscription-capabilities +--ro notc:max-nodes-per-update? uint32 +--ro notc:periodic-notifications-supported? | notification-support +--ro (notc:update-period)? | +--:(notc:minimum-update-period) | | +--ro notc:minimum-update-period? uint32 | +--:(notc:supported-update-period) | +--ro notc:supported-update-period* uint32 +--ro notc:on-change-supported? | notification-support {yp:on-change}? +--ro notc:minimum-dampening-period? uint32 | {yp:on-change}? +--ro notc:supported-excluded-change-type* union | {yp:on-change}? +--ro ypr:yang-push-module-revision-supported? boolean {yang-push-revision-supported}? 5.2. YANG Module The YANG module has two leaves augmenting the model of Subscription to YANG Notifications [RFC8639]. file "ietf-yang-push-revision@2024-12-17.yang" module ietf-yang-push-revision { yang-version 1.1; namespace "urn:ietf:params:xml:ns:yang:ietf-yang-push-revision"; prefix ypr; import ietf-subscribed-notifications { prefix sn; reference "RFC 8639: Subscription to YANG Notifications"; } import ietf-yang-revisions { prefix rev; reference "RFC YYYY: draft-ietf-netmod-yang-module-versioning-11, Updated YANG Module Revision Handling"; } import ietf-yang-types { prefix yang; rev:recommended-min-date "2013-07-15"; reference "RFC 6991: Common YANG Data Types."; } import ietf-yang-semver { Graf, et al. Expires 21 July 2025 [Page 21] Internet-Draft YANG Notifications Versioning January 2025 prefix ysver; reference "RFC ZZZZ: draft-ietf-netmod-yang-semver-15, YANG Semantic Versioning"; } import ietf-yang-library { prefix yanglib; reference "RFC 8525: YANG Library"; } import ietf-system-capabilities { prefix sysc; reference "RFC 9196: YANG Modules Describing Capabilities for Systems and Datastore Update Notifications"; } import ietf-notification-capabilities { prefix notc; reference "RFC 9196: YANG Modules Describing Capabilities for Systems and Datastore Update Notifications"; } organization "IETF NETCONF (Network Configuration) Working Group"; contact "WG Web: WG List: Authors: Thomas Graf Benoit Claise Alex Huang Feng "; description "Defines YANG push event notification header with the revision and the revision-label. Adds the support of the revision and revision-label selection in the YANG push subscription RPCs. Copyright (c) 2023 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 Revised 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). Graf, et al. Expires 21 July 2025 [Page 22] Internet-Draft YANG Notifications Versioning January 2025 This version of this YANG module is part of RFC XXXX; see the RFC itself for full legal notices."; revision 2024-12-17 { description "First revision"; reference "RFC XXXX: Support of Versioning in YANG Notifications Subscription"; } feature yang-push-revision-supported { description "This feature indicates the YANG Subscription Notifications supports specifying the list of modules, revisions and revision-label in the YANG subscription."; } // Identities identity revision-unsupported { base sn:establish-subscription-error; base sn:modify-subscription-error; description "Revision not supported. This failure can be due to subscribing to a specific revision not supported by the publisher."; } identity revision-label-unsupported { base sn:establish-subscription-error; base sn:modify-subscription-error; description "Revision-label not supported. This failure can be due to subscribing to a specific revision-label not supported by the publisher."; } identity incompatible-revision-and-revision-label { base sn:establish-subscription-error; base sn:modify-subscription-error; description "The combination of revision and the revision-label are incompatible. This failure happens when the revision and the revision-label are both specified in the RPC and the YANG module supported by the publisher does not support one of the revision or the revision-label."; } grouping yang-push-module-version-config { description Graf, et al. Expires 21 July 2025 [Page 23] Internet-Draft YANG Notifications Versioning January 2025 "This grouping combines the module name, the revision and revision-label leaves. This grouping is to be used for configuration and the leaves are not mandatory."; leaf module-name { type yang:yang-identifier; description "This references the YANG module name."; } leaf revision { type rev:revision-date; description "This references the YANG module revision to be sent in the subscription."; } leaf revision-label { type ysver:version; description "This references the YANG module semantic version to be sent in the subscription."; } } grouping yang-push-module-version { description "This grouping combines the module name, the revision and revision-label leaves. This grouping is to be used for read-only cases such as the content of YANG push Notifications. The module-name and revision are mandatory and MUST be present in the data."; leaf module-name { type yang:yang-identifier; config false; mandatory true; description "This references the YANG module name."; } leaf revision { type rev:revision-date; config false; mandatory true; description "This references the YANG module revision of the sent notification message."; } leaf revision-label { type ysver:version; description "This references the YANG module semantic version of the sent Graf, et al. Expires 21 July 2025 [Page 24] Internet-Draft YANG Notifications Versioning January 2025 notification message."; } } grouping yang-push-module-version-list { description "This grouping defines a list of yang-push-module-version grouping."; list module-version { key "module-name"; config false; description "List of yang-push-module-version grouping. The revision is not configurable."; uses ypr:yang-push-module-version; } leaf yang-library-content-id { config false; type leafref { path "/yanglib:yang-library/yanglib:content-id"; } description "Contains the YANG library content identifier RFC 8525 information."; } } grouping yang-push-module-version-config-list { description "This grouping defines a list of yang-push-module-version-config grouping."; list module-version-config { key "module-name"; description "List of yang-push-module-version-config grouping. The revision is configurable."; uses ypr:yang-push-module-version-config; } } // Subscription parameters augment "/sn:establish-subscription/sn:input" { if-feature "yang-push-revision-supported"; description "Augment the establish-subscription RPC from the ietf-subscribed-notifications YANG module with the yang-push-module-version-config-list grouping."; uses ypr:yang-push-module-version-config-list; Graf, et al. Expires 21 July 2025 [Page 25] Internet-Draft YANG Notifications Versioning January 2025 } augment "/sn:modify-subscription/sn:input" { if-feature "yang-push-revision-supported"; description "Augment the modify-subscription RPC from the ietf-subscribed-notifications YANG module with the yang-push-module-version-config-list grouping."; uses ypr:yang-push-module-version-config-list; } // Subscription notifications augment "/sn:subscription-started" { if-feature "yang-push-revision-supported"; description "Augment the subscription-started notification from the ietf-subscribed-notifications YANG module with the yang-push-module-version-list grouping."; uses ypr:yang-push-module-version-list; } augment "/sn:subscription-modified" { if-feature "yang-push-revision-supported"; description "Augment the subscription-modified notification from the ietf-subscribed-notifications YANG module with the yang-push-module-version-list grouping."; uses ypr:yang-push-module-version-list; } // Subscription container augment "/sn:subscriptions/sn:subscription" { if-feature "yang-push-revision-supported"; description "Augment the subscriptions RPC container from the ietf-subscribed-notifications YANG module with the yang-push-module-version-config-list grouping."; uses ypr:yang-push-module-version-config-list; } // Event capabilities augment "/sysc:system-capabilities/notc:subscription-capabilities" { description "Add system level capabilities"; leaf yang-push-module-revision-supported { type boolean; description "Specifies whether the publisher supports exporting revision and revision-label in YANG-Push subscription state change notifications."; Graf, et al. Expires 21 July 2025 [Page 26] Internet-Draft YANG Notifications Versioning January 2025 reference "RFC XXXX: Support of Versioning in YANG Notifications Subscription"; } } } 6. IANA Considerations 6.1. IETF XML Registry This document registers the following URIs in the "IETF XML Registry" [RFC3688]: URI: urn:ietf:params:xml:ns:yang:ietf-yang-push-revision Registrant Contact: The IESG. XML: N/A; the requested URI is an XML namespace. 6.2. YANG Module Name This document registers the following YANG modules in the "YANG Module Names" registry [RFC6020]: name: ietf-yang-push-revision namespace: urn:ietf:params:xml:ns:yang:ietf-yang-push-revision prefix: ypr reference: RFC-to-be 7. Operational Considerations A YANG package [I-D.ietf-netmod-yang-packages], specifies a versioned organizational structure used to manage a set of YANG modules that collectively defines a package schema. For example, a YANG package could contain a set of YANG modules required to implement a L3VPN service on a network node. It offers therefore a complementary information to the solution in this draft by describing how one specific YANG module revision is part of a set of YANG modules. 8. Implementation Status Note to the RFC-Editor: Please remove this section before publishing. 8.1. Huawei VRP Huawei implemented in notification the module, revision and revision- label extension as described in Section 3 for a YANG-Push publisher on UDP-based Transport for Configured Subscriptions [I-D.ietf-netconf-udp-notif] in their VRP platform. Graf, et al. Expires 21 July 2025 [Page 27] Internet-Draft YANG Notifications Versioning January 2025 8.2. 6WIND VSR 6WIND implemented in notification module and revision extension as described in Section 3 for a YANG-Push publisher on UDP-based Transport for Configured Subscriptions [I-D.ietf-netconf-udp-notif] in their VSR platform. 8.3. Cisco IOS XR Cisco implemented in notification module and revision extension as described in Section 3 and module and revision in subscription as described in Section 2for a YANG-Push publisher on UDP-based Transport for Configured Subscriptions [I-D.ietf-netconf-udp-notif] in their IOS XR platform. 9. Security Considerations The security considerations for the YANG notifications subscription mechanism are described in [RFC8641]. This documents adds no additional security considerations. 10. Acknowledgements The authors would like to thank Qiufang Ma and Robert Wilton for their review and valuable comments. 11. References 11.1. Normative References [I-D.ietf-netmod-yang-module-versioning] Wilton, R., Rahman, R., Lengyel, B., Clarke, J., and J. Sterne, "Updated YANG Module Revision Handling", Work in Progress, Internet-Draft, draft-ietf-netmod-yang-module- versioning-12, 24 June 2024, . [I-D.ietf-netmod-yang-semver] Clarke, J., Wilton, R., Rahman, R., Lengyel, B., Sterne, J., and B. Claise, "YANG Semantic Versioning", Work in Progress, Internet-Draft, draft-ietf-netmod-yang-semver- 18, 7 January 2025, . Graf, et al. Expires 21 July 2025 [Page 28] Internet-Draft YANG Notifications Versioning January 2025 [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, . [RFC6020] Bjorklund, M., Ed., "YANG - A Data Modeling Language for the Network Configuration Protocol (NETCONF)", RFC 6020, DOI 10.17487/RFC6020, 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, . [RFC8174] Leiba, B., "Ambiguity of Uppercase vs Lowercase in RFC 2119 Key Words", BCP 14, RFC 8174, DOI 10.17487/RFC8174, May 2017, . [RFC8525] Bierman, A., Bjorklund, M., Schoenwaelder, J., Watsen, K., and R. Wilton, "YANG Library", RFC 8525, DOI 10.17487/RFC8525, March 2019, . [RFC8639] Voit, E., Clemm, A., Gonzalez Prieto, A., Nilsen-Nygaard, E., and A. Tripathy, "Subscription to YANG Notifications", RFC 8639, DOI 10.17487/RFC8639, September 2019, . [RFC8641] Clemm, A. and E. Voit, "Subscription to YANG Notifications for Datastore Updates", RFC 8641, DOI 10.17487/RFC8641, September 2019, . [RFC9196] Lengyel, B., Clemm, A., and B. Claise, "YANG Modules Describing Capabilities for Systems and Datastore Update Notifications", RFC 9196, DOI 10.17487/RFC9196, February 2022, . 11.2. Informative References Graf, et al. Expires 21 July 2025 [Page 29] Internet-Draft YANG Notifications Versioning January 2025 [I-D.ietf-netconf-https-notif] Jethanandani, M. and K. Watsen, "An HTTPS-based Transport for YANG Notifications", Work in Progress, Internet-Draft, draft-ietf-netconf-https-notif-15, 1 February 2024, . [I-D.ietf-netconf-udp-notif] Zheng, G., Zhou, T., Graf, T., Francois, P., Feng, A. H., and P. Lucente, "UDP-based Transport for Configured Subscriptions", Work in Progress, Internet-Draft, draft- ietf-netconf-udp-notif-18, 13 January 2025, . [I-D.ietf-netmod-yang-packages] Wilton, R., Rahman, R., Clarke, J., Sterne, J., and B. Wu, "YANG Packages", Work in Progress, Internet-Draft, draft- ietf-netmod-yang-packages-04, 21 October 2024, . [RFC8259] Bray, T., Ed., "The JavaScript Object Notation (JSON) Data Interchange Format", STD 90, RFC 8259, DOI 10.17487/RFC8259, December 2017, . [RFC8340] Bjorklund, M. and L. Berger, Ed., "YANG Tree Diagrams", BCP 215, RFC 8340, DOI 10.17487/RFC8340, March 2018, . [RFC8343] Bjorklund, M., "A YANG Data Model for Interface Management", RFC 8343, DOI 10.17487/RFC8343, March 2018, . [RFC8640] Voit, E., Clemm, A., Gonzalez Prieto, A., Nilsen-Nygaard, E., and A. Tripathy, "Dynamic Subscription to YANG Events and Datastores over NETCONF", RFC 8640, DOI 10.17487/RFC8640, September 2019, . [W3C.REC-xml-20081126] Bray, T., Paoli, J., Sperberg-McQueen, M., Maler, E., and F. Yergeau, "Extensible Markup Language (XML) 1.0 (Fifth Edition)", World Wide Web Consortium Recommendation REC- xml-20081126, November 2008, . Graf, et al. Expires 21 July 2025 [Page 30] Internet-Draft YANG Notifications Versioning January 2025 Authors' Addresses Thomas Graf Swisscom Binzring 17 CH-8045 Zurich Switzerland Email: thomas.graf@swisscom.com Benoit Claise Huawei Email: benoit.claise@huawei.com Alex Huang Feng INSA-Lyon Lyon France Email: alex.huang-feng@insa-lyon.fr Graf, et al. Expires 21 July 2025 [Page 31]