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Introduction There is a need to document data defined in YANG models when a live server is unavailable. Data is often needed at design time, implementation time, or even later when a live running server is unavailable. To facilitate this offline delivery of data, this document specifies a standard format for YANG instance data sets and YANG instance data files. The format of the instance data set is defined by the "ietf-yang-instance-data" YANG module; see . The YANG data model in this document conforms to the Network Management Datastore Architecture (NMDA) defined in . The following is a list of already-implemented and potential use cases.
  1. Documentation of server capabilities
  2. Preloading default configuration data
  3. Documenting factory default settings
  4. Storing the configuration of a device, e.g., for backup, archive, or audit purposes
  5. Storing diagnostics data
  6. Allowing YANG instance data to potentially be carried within other inter-process communication (IPC) message formats
  7. Default instance data used as part of a templating solution
  8. Providing data examples in RFCs or internet drafts
describes the first three use cases in detail. There are many and varied use cases where YANG instance data could be used. This document does not limit future uses of instance data sets, so specifying how and when to use YANG instance data is out of scope for this document. It is anticipated that other documents will define specific use cases. Use cases are listed only as examples. 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 when, and only when, they appear in all capitals, as shown here.
Instance Data:
A collection of instantiated data nodes.
Instance Data Set:
A named set of data items annotated with metadata that can be used as instance data in a YANG data tree.
Instance Data File:
A file containing an instance data set formatted according to the rules described in this document.
Content-schema:
A set of YANG modules with their revision, supported features, and deviations for which the instance data set contains instance data.
Content-defining YANG Module:
An individual YANG module that is part of the content-schema.
The term "server" is used as defined in . Principles The following is a list of the basic principles of the instance data format:
  1. Two standard formats shall be defined based on the XML and JSON encodings.
  2. Instance data shall reuse existing encoding rules for YANG-defined data.
  3. Metadata about the instance data set () shall be defined.
  4. A YANG instance data set shall be allowed to contain data for multiple YANG modules.
  5. Instance data shall be allowed to contain configuration data, state data, or a mix of the two.
  6. Partial data sets shall be allowed.
  7. The YANG instance data format shall be usable for any data for which YANG module(s) are defined and available to the reader, independent of whether the module is implemented by a server.
  8. It shall be possible to report the identity of the datastore with which the instance data set is associated.
Delivery of Instance Data Instance data sets that are produced as a result of some sort of specification or design effort may be available without the need for a live server, e.g., via download from the vendor's website or in any other way that product documentation is distributed. Other instance data sets may be read from or produced by the YANG server itself, e.g., UC5 documenting diagnostic data. Data Life Cycle A YANG instance data set is created at a specific point of time. If the data changes afterwards, the instance data set will no longer represent the current data unless it is updated. The current values may be retrieved at runtime via NETCONF/RESTCONF or received, e.g., in YANG-Push notifications. Whether the instance data changes and, if so, when and how should be described either in the instance data set's description statement or in some other implementation-specific manner. Instance Data File Format A YANG instance data file MUST contain a single instance data set and no additional data. The format of the instance data set is defined by the "ietf-yang-instance-data" YANG module. It is made up of a header part and content-data. The header part carries metadata for the instance data set. The content-data, defined as an anydata data node, carries the instance data that the user wants to document and/or provide. The syntax and semantics of content-data are defined by the content-schema. Two formats are specified based on the XML and JSON YANG encodings. The file formats are achieved by applying the respective XML and JSON encoding rules for the YANG structure included in this document. Later, as other YANG encodings (e.g., CBOR) are defined, further instance data formats may be specified. The content-data part MUST conform to the content-schema while allowing for the exceptions listed below. The content-data part SHALL follow the encoding rules defined in for XML and for JSON and MUST use UTF-8 character encoding. Content-data MAY include: An instance data set MAY contain data for any number of YANG modules; if needed, it MAY carry the complete configuration and state data for a server. Default values should be excluded where they do not provide additional useful data. Configuration ("config true") and operational state data ("config false") MAY be mixed in the instance data file. Instance data files MAY contain partial data sets. This means "mandatory", "min-elements", "require-instance true", "must", and "when" constraints MAY be violated. The name of the instance data file SHOULD be of the following form (using ABNF notation ): instance-data-set-name ["@" ( revision-date / timestamp ) ] ( ".xml" / ".json" ) Examples include: acme-router-modules.xml acme-router-modules@2018-01-25.xml acme-router-modules@2018-01-25T15_06_34_3+01_00.json If the leaf "name" is present in the instance data header, its value SHOULD be used for the "instance-data-set-name" in the filename. If the "revision-date" is present in the filename, it MUST conform to the format of the revision-date leaf in the YANG model. If the "revision-date" is present in both the filename and the instance data header, the revision date in the filename MUST be set to the latest revision date inside the instance data set. If the "timestamp" is present in the filename, it MUST conform to the format of the timestamp leaf in the YANG model except for replacing colons as described below. If the "timestamp" is present in both the filename and the instance data header, the timestamp in the filename SHOULD be set to the timestamp inside the instance data set; any colons, if present, shall be replaced by underscores. Metadata, information about the data set itself, MUST be included. Some metadata items are defined in the YANG module "ietf-yang-instance-data", but other items MAY be used. Metadata MUST include: Metadata SHOULD include: Specifying the Content Schema To properly understand and use an instance data set, the user needs to know the content-schema. The content-schema can be specified either in external documents or within the instance data set. In the latter case, one of the following methods MUST be used:
Inline method:
Include the needed information as part of the instance data set.
Simplified-inline method:
Include the needed information as part of the instance data set; only the modules' name and revision-date are used.
URI method:
Include a URI that references another YANG instance data file. This instance data file will use the same content-schema as the referenced YANG instance data file (if you don't want to repeat the info again and again).
Additional methods, e.g., a YANG-package-based solution may be added later. Note that the specified content-schema only indicates the set of modules that were used to define this YANG instance data set. Sometimes instance data may be used for a server supporting a different YANG module set (e.g., for the "Preloading default configuration data" use case, UC2 in , the instance data set may not be updated every time the YANG modules on the server are updated). Whether an instance data set originally defined using a specific content-schema is usable with another schema depends on many factors, including the number of differences and the compatibility between the original and the other schema when considering modules, revisions, features, deviations, the scope of the instance data, etc. Inline Method The "inline-yang-library" anydata data node carries instance data (conforming to "ietf-yang-library@2019-01-04") that specifies the content-defining YANG modules, including revision, supported features, deviations, and any additional relevant data. An example of the inline method is provided in . Simplified-Inline Method The instance data set contains a list of content-defining YANG modules, including the revision date for each. Usage of this method implies that the modules are used without any deviations and with all features supported. YANG modules that are only required to satisfy import-only dependencies MAY be excluded from the leaf-list. If they are excluded, then the consumer of the instance data set has to apply the YANG language rules to resolve the imports. An example of the simplified-inline method is provided in . URI Method The "same-schema-as-file" leaf SHALL contain a URI that references another YANG instance data file. The current instance data file will use the same content-schema as the referenced file. The referenced instance data file MAY have no content-data if it is used solely for specifying the content-schema. If a referenced instance data file is unavailable, the content-schema is unknown. The URI method is advantageous when the user wants to avoid the overhead of specifying the content-schema in each instance data file -- for example, in UC6 , when the system creates a diagnostic file every minute to document the state of the server. An example of the URI method is provided in . Examples Documentation of Server Capabilities The example file acme-router-modules@2022-01-20.xml reflects UC1 in . It provides a list of supported YANG modules and NETCONF capabilities for a server. It uses the inline method to specify the content-schema. The example uses artwork folding . ========== NOTE: '\' line wrapping per RFC 8792 =========== <?xml version="1.0" encoding="UTF-8"?> <instance-data-set xmlns=\ "urn:ietf:params:xml:ns:yang:ietf-yang-instance-data"> <name>acme-router-modules</name> <content-schema> <inline-yang-library> <modules-state \ xmlns="urn:ietf:params:xml:ns:yang:ietf-yang-library"> <module> <name>ietf-yang-library</name> <revision>2019-01-04</revision> </module> <module> <name>ietf-netconf-monitoring</name> <revision>2010-10-04</revision> </module> </modules-state> </inline-yang-library> </content-schema> <revision> <date>2020-10-23</date> <description>Initial version</description> </revision> <description>Defines the minimal set of modules that any \ acme-router will contain. This minimal set will \ only change when a new software release is \ introduced.</description> <contact>info@acme.example.com</contact> <content-data> <modules-state \ xmlns="urn:ietf:params:xml:ns:yang:ietf-yang-library"> <module> <name>ietf-yang-library</name> <revision>2019-01-04</revision> <namespace>\ urn:ietf:params:xml:ns:yang:ietf-yang-library\ </namespace> <conformance-type>implement</conformance-type> </module> <module> <name>ietf-system</name> <revision>2014-08-06</revision> <namespace>urn:ietf:params:xml:ns:yang:ietf-system</namespace> <feature>sys:authentication</feature> <feature>sys:local-users</feature> <deviation> <name>acme-system-ext</name> <revision>2018-08-06</revision> </deviation> <conformance-type>implement</conformance-type> </module> <module> <name>ietf-netconf-monitoring</name> <revision>2010-10-04</revision> <namespace>\ urn:ietf:params:xml:ns:yang:ietf-netconf-monitoring\ </namespace> <conformance-type>implement</conformance-type> </module> <module> <name>ietf-yang-types</name> <revision>2013-07-15</revision> <namespace>urn:ietf:params:xml:ns:yang:ietf-yang-types\ </namespace> <conformance-type>import</conformance-type> </module> <module> <name>acme-system-ext</name> <revision>2018-08-06</revision> <namespace>\ urn:rdns:acme.example.com:oammodel:acme-system-ext\ </namespace> <conformance-type>implement</conformance-type> </module> </modules-state> <netconf-state \ xmlns="urn:ietf:params:xml:ns:yang:ietf-netconf-monitoring"> <capabilities> <capability>\ urn:ietf:params:netconf:capability:validate:1.1\ </capability> </capabilities> </netconf-state> </content-data> </instance-data-set> Preloading Default Configuration Data The example file read-only-acm-rules@2022-01-20.xml reflects UC2 in . It provides a default rule set for a read-only operator role. It uses the simplified-inline method for specifying the content-schema. ========== NOTE: '\' line wrapping per RFC 8792 =========== <?xml version="1.0" encoding="UTF-8"?> <instance-data-set xmlns="urn:ietf:params:xml:ns:yang:ietf-yang-instance-data"> <name>read-only-acm-rules</name> <content-schema> <module>ietf-netconf-acm@2018-02-14</module> </content-schema> <revision> <date>2018-07-04</date> <description>Initial version</description> </revision> <description>Default access control rules for a read-only \ role. This set of rules will only change when a new \ software release is introduced.</description> <content-data> <nacm xmlns="urn:ietf:params:xml:ns:yang:ietf-netconf-acm"> <enable-nacm>true</enable-nacm> <read-default>deny</read-default> <exec-default>deny</exec-default> <rule-list> <name>read-only-role</name> <group>read-only-group</group> <rule> <name>read-all</name> <module-name>*</module-name> <access-operation>read</access-operation> <action>permit</action> </rule> </rule-list> </nacm> </content-data> </instance-data-set> Storing Diagnostics Data The example file acme-router-netconf-diagnostics@2018-01-25T17_00_38Z.json reflects UC5 in . An instance data set that contains statistics about the NETCONF server is produced by the server every 15 minutes. As a new set is produced periodically many times a day, a revision-date would be useless; instead, a timestamp is included. ========== NOTE: '\' line wrapping per RFC 8792 =========== { "ietf-yang-instance-data:instance-data-set": { "name": "acme-router-netconf-diagnostics", "content-schema": { "same-schema-as-file": "file:///acme-diagnostics-schema.json" }, "timestamp": "2018-01-25T17:00:38Z", "description": ["NETCONF statistics, \ The data may change at any time."], "content-data": { "ietf-netconf-monitoring:netconf-state": { "statistics": { "netconf-start-time ": "2018-12-05T17:45:00Z", "in-bad-hellos ": "32", "in-sessions ": "397", "dropped-sessions ": "87", "in-rpcs ": "8711", "in-bad-rpcs ": "408", "out-rpc-errors ": "408", "out-notifications": "39007" } } } } } YANG Instance Data Model Tree Diagram The following tree diagram provides an overview of the data model. module: ietf-yang-instance-data structure instance-data-set: +--name? string +--format-version? string +--includes-defaults? enumeration +--content-schema | +--(content-schema-spec)? | +--:(simplified-inline) | | +--module* module-with-revision-date | +--:(inline) | | +--inline-yang-library <anydata> | +--:(uri) | +--same-schema-as-file? inet:uri +--description* string +--contact? string +--organization? string +--datastore? ds:datastore-ref +--revision* [date] | +--date string | +--description? string +--timestamp? yang:date-and-time +--content-data? <anydata> YANG Model This YANG module imports typedefs from , , identities from , and the "structure" extension from . It also references . module ietf-yang-instance-data { yang-version 1.1; namespace "urn:ietf:params:xml:ns:yang:ietf-yang-instance-data"; prefix yid; import ietf-yang-structure-ext { prefix sx; reference "RFC 8791: YANG Data Structure Extensions"; } import ietf-datastores { prefix ds; reference "RFC 8342: Network Management Datastore Architecture (NMDA)"; } import ietf-inet-types { prefix inet; reference "RFC 6991: Common YANG Data Types"; } import ietf-yang-types { prefix yang; reference "RFC 6991: Common YANG Data Types"; } import ietf-netconf-with-defaults { prefix ncwd; reference "RFC 6243: With-defaults Capability for NETCONF"; } organization "IETF NETMOD Working Group"; contact "WG Web: <https://datatracker.ietf.org/wg/netmod/> WG List: <mailto:netmod@ietf.org> Author: Balazs Lengyel <mailto:balazs.lengyel@ericsson.com> Author: Benoit Claise <mailto:benoit.claise@huawei.com>"; description "The module defines the structure and content of YANG instance data sets. 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 (RFC 2119) (RFC 8174) when, and only when, they appear in all capitals, as shown here. Copyright (c) 2022 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). This version of this YANG module is part of RFC 9195 (https://www.rfc-editor.org/info/rfc9195); see the RFC itself for full legal notices."; revision 2022-02-17 { description "Initial revision."; reference "RFC 9195: YANG Instance Data File Format"; } typedef module-with-revision-date { type string { pattern '[a-zA-Z_][a-zA-Z0-9\-_.]*' + '(@\d{4}-(1[0-2]|0[1-9])-(0[1-9]|[1|2][0-9]|3[0-1]))?'; pattern '.|..|[^xX].*|.[^mM].*|..[^lL].*'; } description "A type defining a module name and an optional revision date, e.g., ietf-yang-library@2019-01-04."; } sx:structure instance-data-set { description "A data structure to define a format for YANG instance data. The majority of the YANG nodes provides metadata about the instance data; the instance data itself is contained only in the 'content-data' node."; leaf name { type string; description "An arbitrary name for the YANG instance data set. This value is primarily used for descriptive purposes. However, when the instance data set is saved to a file, then the filename MUST encode the name's value per Section 2 of RFC 9195."; } leaf format-version { type string { pattern '\d{4}-(1[0-2]|0[1-9])-(0[1-9]|[1|2][0-9]|3[0-1])'; } default "2022-01-20"; description "The 'revision' of the 'ietf-yang-instance-data' module used to encode this 'instance-data-set'."; } leaf includes-defaults { type ncwd:with-defaults-mode; default "report-all"; description "Indicates how data nodes with default values are represented for all data nodes contained in the instance-data-set. It uses the same definitions as per Section 3 of RFC 6243 but applied in the context of an instance data file rather than a NETCONF request using the <with-defaults> parameter. For JSON files, the encoding of the 'report-all-tagged' option is as defined in Section 4.8.9 of RFC 8040."; reference "RFC 6243: With-defaults Capability for NETCONF"; } container content-schema { description "The content schema (i.e., YANG modules) used to create the instance data set. If not present, the user needs to obtain the information through external documents."; choice content-schema-spec { description "Specification of the content-schema."; case simplified-inline { leaf-list module { type module-with-revision-date; min-elements 1; description "The list of content-defining YANG modules. The value SHALL start with the module name. If the module contains a revision statement, the revision date SHALL be included in the leaf-list entry, e.g., ietf-yang-library@2019-01-04. Usage of this leaf-list implies the modules are used without any deviations and with all features supported. Multiple revisions of the same module MUST NOT be specified."; } } case inline { anydata inline-yang-library { mandatory true; description "Instance data corresponding to the ietf-yang-library@2019-01-04 defining the set of content-defining YANG modules for this instance-data-set."; } } case uri { leaf same-schema-as-file { type inet:uri; description "A reference to another YANG instance data file. This instance data file uses the same content schema as the referenced file. Referenced files using the 'inline' or the 'simplified-inline' methods MUST be supported. Referenced files using the 'URI method' MAY be supported. The URL schemes 'file://' and 'https://' MUST be supported; other schemes MAY also be supported."; } } } } leaf-list description { type string; description "Description of the instance data set."; } leaf contact { type string; description "Contact information for the person or organization to whom queries concerning this instance data set should be sent."; } leaf organization { type string; description "Organization responsible for the instance data set."; } leaf datastore { type ds:datastore-ref; description "The identity of the datastore with which the instance data set is associated, e.g., the datastore from where the data was read, the datastore into which the data may be loaded, or the datastore that is being documented. If a single specific datastore cannot be specified, the leaf MUST be absent. If this leaf is absent, then the datastore to which the instance data belongs is unspecified."; } list revision { key "date"; description "Instance data sets that are produced as a result of some sort of specification or design effort SHOULD have at least one revision entry. For every published editorial change, a new unique revision SHOULD be added in front of the revisions sequence so that all revisions are in reverse chronological order. In cases of instance data sets that are read from or produced by a server or otherwise subject to frequent updates or changes, revision SHOULD NOT be present."; leaf date { type string { pattern '\d{4}-(1[0-2]|0[1-9])-(0[1-9]|[1|2][0-9]|3[0-1])'; } description "Specifies the date the instance data set was last modified. Formatted as YYYY-MM-DD."; } leaf description { type string; description "Description of this revision of the instance data set."; } } leaf timestamp { type yang:date-and-time; description "The date and time when the instance data set was last modified. In cases of instance data sets that are read from or produced by a server or otherwise subject to frequent updates or changes, the timestamp SHOULD be present. If both a revision list entry and timestamp are present, the timestamp SHOULD contain the same date as the latest revision statement."; } anydata content-data { description "Contains the real instance data. The data MUST conform to the relevant YANG modules specified either in the content-schema or in some other implementation-specific manner."; } } } Security Considerations The YANG module defined in this document only defines a wrapper structure specifying a format and a metadata header for YANG instance data defined by the content-schema. Because of this, the security considerations template for YANG models in is not followed. The instance data is designed to be accessed as a stored file or over any file access method or protocol. The document does not specify any method to influence the behavior of a server. The header part is usually not security sensitive; however, sensitive information may be included, in which case it needs to be handled securely, as mentioned below. Information to consider includes: The content part may contain sensitive data. The security sensitivity of this data is completely dependent on the content-schema. Depending on the nature of the instance data, instance data files MAY need to be handled securely. The same kind of handling should be applied to this file at rest and in transit that would be needed for the result of a read operation returning the same data. These in-transit protection mechanisms will also mitigate integrity issues when transporting the file. Instance data files should be protected against modification or unauthorized access using normal file-handling mechanisms. When copying the original files or providing file access for additional users, care should be taken not to reveal information unintentionally. If the URI method is used for specification of the content-schema, there is a risk that the config schema section in the referenced YANG instance data file may be altered maliciously or even as part of its normal handling. In this case, the content-schema might differ from the one expected. Protecting the integrity and stability of the referenced file should be ensured. IANA Considerations This document registers one URI and one YANG module. URI Registration This document registers the following URI in the "IETF XML Registry" :
URI:
urn:ietf:params:xml:ns:yang:ietf-yang-instance-data
Registrant Contact:
The IESG.
XML:
N/A, the requested URI is an XML namespace.
YANG Module Name Registration This document registers the following YANG module in the "YANG Module Names" registry :
Name:
ietf-yang-instance-data
Namespace:
urn:ietf:params:xml:ns:yang:ietf-yang-instance-data
Prefix:
yid
Reference:
RFC 9195
References Normative References Key words for use in RFCs to Indicate Requirement Levels In many standards track documents several words are used to signify the requirements in the specification. These words are often capitalized. This document defines these words as they should be interpreted in IETF documents. This document specifies an Internet Best Current Practices for the Internet Community, and requests discussion and suggestions for improvements. Augmented BNF for Syntax Specifications: ABNF Internet technical specifications often need to define a formal syntax. Over the years, a modified version of Backus-Naur Form (BNF), called Augmented BNF (ABNF), has been popular among many Internet specifications. The current specification documents ABNF. It balances compactness and simplicity with reasonable representational power. The differences between standard BNF and ABNF involve naming rules, repetition, alternatives, order-independence, and value ranges. This specification also supplies additional rule definitions and encoding for a core lexical analyzer of the type common to several Internet specifications. [STANDARDS-TRACK] YANG - A Data Modeling Language for the Network Configuration Protocol (NETCONF) YANG is a data modeling language used to model configuration and state data manipulated by the Network Configuration Protocol (NETCONF), NETCONF remote procedure calls, and NETCONF notifications. [STANDARDS-TRACK] With-defaults Capability for NETCONF The Network Configuration Protocol (NETCONF) defines ways to read and edit configuration data from a NETCONF server. In some cases, part of this data may not be set by the NETCONF client, but rather a default value known to the server is used instead. In many situations the NETCONF client has a priori knowledge about default data, so the NETCONF server does not need to save it in a NETCONF configuration datastore or send it to the client in a retrieval operation reply. In other situations the NETCONF client will need this data from the server. Not all server implementations treat this default data the same way. This document defines a capability-based extension to the NETCONF protocol that allows the NETCONF client to identify how defaults are processed by the server, and also defines new mechanisms for client control of server processing of default data. [STANDARDS-TRACK] Common YANG Data Types This document introduces a collection of common data types to be used with the YANG data modeling language. This document obsoletes RFC 6021. The YANG 1.1 Data Modeling Language YANG is a data modeling language used to model configuration data, state data, Remote Procedure Calls, and notifications for network management protocols. This document describes the syntax and semantics of version 1.1 of the YANG language. YANG version 1.1 is a maintenance release of the YANG language, addressing ambiguities and defects in the original specification. There are a small number of backward incompatibilities from YANG version 1. This document also specifies the YANG mappings to the Network Configuration Protocol (NETCONF). JSON Encoding of Data Modeled with YANG This document defines encoding rules for representing configuration data, state data, parameters of Remote Procedure Call (RPC) operations or actions, and notifications defined using YANG as JavaScript Object Notation (JSON) text. Defining and Using Metadata with YANG This document defines a YANG extension that allows for defining metadata annotations in YANG modules. The document also specifies XML and JSON encoding of annotations and other rules for annotating instances of YANG data nodes. Ambiguity of Uppercase vs Lowercase in RFC 2119 Key Words RFC 2119 specifies common key words that may be used in protocol specifications. This document aims to reduce the ambiguity by clarifying that only UPPERCASE usage of the key words have the defined special meanings. Network Management Datastore Architecture (NMDA) Datastores are a fundamental concept binding the data models written in the YANG data modeling language to network management protocols such as the Network Configuration Protocol (NETCONF) and RESTCONF. This document defines an architectural framework for datastores based on the experience gained with the initial simpler model, addressing requirements that were not well supported in the initial model. This document updates RFC 7950. YANG Library This document describes a YANG library that provides information about the YANG modules, datastores, and datastore schemas used by a network management server. Simple caching mechanisms are provided to allow clients to minimize retrieval of this information. This version of the YANG library supports the Network Management Datastore Architecture (NMDA) by listing all datastores supported by a network management server and the schema that is used by each of these datastores. NETCONF Extensions to Support the Network Management Datastore Architecture This document extends the Network Configuration Protocol (NETCONF) defined in RFC 6241 in order to support the Network Management Datastore Architecture (NMDA) defined in RFC 8342. This document updates RFCs 6241 and 7950. The update to RFC 6241 adds new <get-data> and <edit-data> operations and augments existing <lock>, <unlock>, and <validate> operations. The update to RFC 7950 requires the usage of the YANG library (described in RFC 8525) by NETCONF servers implementing the NMDA. RESTCONF Extensions to Support the Network Management Datastore Architecture This document extends the RESTCONF protocol defined in RFC 8040 in order to support the Network Management Datastore Architecture (NMDA) defined in RFC 8342. This document updates RFC 8040 by introducing new datastore resources, adding a new query parameter, and requiring the usage of the YANG library (described in RFC 8525) by RESTCONF servers implementing the NMDA. YANG Data Structure Extensions This document describes YANG mechanisms for defining abstract data structures with YANG. Informative References The IETF XML Registry This document describes an IANA maintained registry for IETF standards which use Extensible Markup Language (XML) related items such as Namespaces, Document Type Declarations (DTDs), Schemas, and Resource Description Framework (RDF) Schemas. YANG Tree Diagrams This document captures the current syntax used in YANG module tree diagrams. The purpose of this document is to provide a single location for this definition. This syntax may be updated from time to time based on the evolution of the YANG language. Guidelines for Authors and Reviewers of Documents Containing YANG Data Models This memo provides guidelines for authors and reviewers of specifications containing YANG modules. Recommendations and procedures are defined, which are intended to increase interoperability and usability of Network Configuration Protocol (NETCONF) and RESTCONF protocol implementations that utilize YANG modules. This document obsoletes RFC 6087. A YANG Data Model for Alarm Management This document defines a YANG module for alarm management. It includes functions for alarm-list management, alarm shelving, and notifications to inform management systems. There are also operations to manage the operator state of an alarm and administrative alarm procedures. The module carefully maps to relevant alarm standards. Subscription to YANG Notifications for Datastore Updates This document describes a mechanism that allows subscriber applications to request a continuous and customized stream of updates from a YANG datastore. Providing such visibility into updates enables new capabilities based on the remote mirroring and monitoring of configuration and operational state. Handling Long Lines in Content of Internet-Drafts and RFCs This document defines two strategies for handling long lines in width-bounded text content. One strategy, called the "single backslash" strategy, is based on the historical use of a single backslash ('\') character to indicate where line-folding has occurred, with the continuation occurring with the first character that is not a space character (' ') on the next line. The second strategy, called the "double backslash" strategy, extends the first strategy by adding a second backslash character to identify where the continuation begins and is thereby able to handle cases not supported by the first strategy. Both strategies use a self-describing header enabling automated reconstitution of the original content. A YANG Data Model for Factory Default Settings This document defines a YANG data model with the "factory-reset" RPC to allow clients to reset a server back to its factory default condition. It also defines an optional "factory-default" datastore to allow clients to read the factory default configuration for the device. The YANG data model in this document conforms to the Network Management Datastore Architecture (NMDA) defined in RFC 8342. Backwards Compatibility The concept of "backwards compatibility" and what changes are backwards compatible are not defined for instance data sets as they are highly dependent on the specific use case and the content-schema. In case of "instance data sets" that are the result of design or specification activity, some changes that may be good to avoid are listed below. YANG uses the concept of managed entities identified by key values; if the connection between the represented entity and the key value is not preserved during an update, this may lead to the following problems. Detailed Use Cases This section is non-normative. Use Case 1: Early Documentation of Server Capabilities A server has a number of server capabilities that are defined in YANG modules and can be retrieved from the server using protocols like NETCONF or RESTCONF. Server capabilities include: While it is good practice to allow a client to query these capabilities from the live server, that is often not possible. Often when a network node is released, an associated Network Management System (NMS) is also released with it. The NMS depends on the capabilities of the server. During NMS implementation, information about server capabilities is needed. If the information is unavailable early in some offline document but only as instance data from the live network node, the NMS implementation will be delayed because it has to wait until the network node is ready. Also, assuming that all NMS implementors will have correctly configured network nodes from which data can be retrieved is a very expensive proposition. (An NMS may handle dozens of node types.) Network operators often build their own homegrown NMS systems that need to be integrated with a vendor's network node. The operator needs to know the network node's server capabilities in order to do this. Moreover, the network operator's decision to buy a vendor's product may even be influenced by the network node's Operations, Administration, and Maintenance (OAM) feature set documented as the server's capabilities. Beside NMS implementors, system integrators and many others also need the same information early. Examples could be model-driven testing, generating documentation, etc. Most server capabilities are relatively stable and change only during upgrade or due to licensing or the addition or removal of hardware. They are usually defined by a vendor at design time, before the product is released. It is feasible and advantageous to define and document them early, e.g., in a YANG instance data file. It is anticipated that a separate IETF document will define in detail how and which set of server capabilities should be documented. Use Case 2: Preloading Data There are parts of the configuration that must be fully configurable by the operator. However, a simple default configuration often will be sufficient. One example is access control groups/roles and related rules. While a sophisticated operator may define dozens of different groups, often a basic (read-only operator, read-write system administrator, security-administrator) triplet will be enough. Vendors will often provide such default configuration data to make device configuration easier for an operator. The device vendor may define a set of default groups (/nacm:nacm/groups) and rules for these groups to access specific parts of the common models (/nacm:nacm/rule-list/rule). YANG instance data files can be used to document and/or preload the default configuration. Use Case 3: Documenting Factory Default Settings Nearly every server has a factory default configuration. If the system is really badly misconfigured or if the current configuration is to be abandoned, the system can be reset to the default factory configuration. YANG instance data can be used to document the factory default configuration. See . Acknowledgments For their valuable comments, discussions, and feedback, we wish to acknowledge , , , , , , , , and other members of the Netmod Working Group. Authors' Addresses Ericsson Magyar Tudosok korutja 11 Budapest Hungary 1117 balazs.lengyel@ericsson.com Huawei benoit.claise@huawei.com

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