| Network Working Group | A. Bierman |
| Internet-Draft | YumaWorks |
| Obsoletes: 7895 (if approved) | M. Bjorklund |
| Intended status: Standards Track | Tail-f Systems |
| Expires: April 20, 2019 | J. Schoenwaelder |
| Jacobs University | |
| K. Watsen | |
| Juniper Networks | |
| R. Wilton | |
| Cisco Systems | |
| October 17, 2018 |
YANG Library
draft-ietf-netconf-rfc7895bis-07
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 by listing all datastores supported by a network management server and the schema that is used by each of these datastores.
This document obsoletes RFC 7895.
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 April 20, 2019.
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 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.
There is a need for a standard mechanism to expose which YANG modules [RFC7950], datastores and datastore schemas [RFC8342] are in use by a network management server.
This document defines the YANG module "ietf‑yang‑library" that provides this information. This version of the YANG library is compatible with the Network Management Datastore Architecture (NMDA) [RFC8342]. The previous version of the YANG library, defined in [RFC7895], is not compatible with the NMDA since it assumes that all datastores have exactly the same schema. This is not necessarily true in the NMDA since dynamic configuration datastores may have their own datastore schema. Furthermore, the operational state datastore may support non-configurable YANG modules in addition to the YANG modules supported by conventional configuration datastores.
The old YANG library definitions have been retained (for backwards compatibility reasons) but the definitions have been marked as deprecated. For backwards compatibility, an NMDA-supporting server SHOULD populate the deprecated "/modules‑state" tree in a backwards-compatible manner. The new "/yang‑library" tree would be ignored by legacy clients, while providing all the data needed for NMDA-aware clients, which would themselves ignore the "/modules‑state" tree. The recommended approach to populate "/modules‑state" is to report the schema for YANG modules that are configurable via conventional configuration datastores and for which config false data nodes are returned via a NETCONF <get> operation, or equivalent.
The YANG library information can be different on every server and it can change at runtime or across a server reboot. If a server implements multiple network management protocols to access the server's datastores, then each such protocol may have its own conceptual instantiation of the YANG library.
If a large number of YANG modules are utilized by a server, then the YANG library contents can be relatively large. Since the YANG library contents changes very infrequently, it is important that clients be able to cache the YANG library contents and easily identify whether their cache is out of date.
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 [RFC7950]:
This document uses the phrase "implementing a module" as defined in [RFC7950] Section 5.6.5.
The following terms are defined in [RFC8342]:
The following terms are used within this document:
Tree diagrams used in this document use the notation defined in [RFC8340].
The following information is needed by a client application (for each YANG module in the library) to fully utilize the YANG data modeling language:
In addition, the following information is needed by a client application for each datastore supported by a server:
In order to select one out of several possible data model designs, the following criteria were used:
The "ietf‑yang‑library" YANG module provides information about the modules, submodules, datastores, and datastore schemas supported by a server. All data nodes in "ietf‑yang‑library" are "config false", and thus only accessible in the operational state datastore.
+-----------+
| datastore |
+-----------+
|
| has a
V
+-----------+ +--------+ +------------+
| datastore | union of | module | consists of | modules + |
| schema |----------->| set |--------------->| submodules |
+-----------+ +--------+ +------------+
Figure 1
The conceptual model of the YANG library is depicted in Figure 1. Following the NMDA, every datastore has an associated datastore schema. A datastore schema is a union of module sets and every module set is a collection of modules and submodules, including the modules and submodules used for imports. Note that multiple datastores may refer to the same datastore schema. Furthermore, it is possible that individual datastore schemas share module sets. A common use case is the operational state datastore schema which is a superset of the schema used by conventional configuration datastores.
Below is the YANG Tree Diagram for the "ietf‑yang‑library" module, excluding the deprecated "modules‑state" tree:
module: ietf-yang-library
+--ro yang-library
+--ro module-set* [name]
| +--ro name string
| +--ro module* [name]
| | +--ro name yang:yang-identifier
| | +--ro revision? revision-identifier
| | +--ro namespace inet:uri
| | +--ro location* inet:uri
| | +--ro submodule* [name]
| | | +--ro name yang:yang-identifier
| | | +--ro revision? revision-identifier
| | | +--ro location* inet:uri
| | +--ro feature* yang:yang-identifier
| | +--ro deviation* -> ../../module/name
| +--ro import-only-module* [name revision]
| +--ro name yang:yang-identifier
| +--ro revision union
| +--ro namespace inet:uri
| +--ro location* inet:uri
| +--ro submodule* [name]
| +--ro name yang:yang-identifier
| +--ro revision? revision-identifier
| +--ro location* inet:uri
+--ro schema* [name]
| +--ro name string
| +--ro module-set* -> ../../module-set/name
+--ro datastore* [name]
| +--ro name ds:datastore-ref
| +--ro schema -> ../../schema/name
+--ro content-id string
notifications:
+---n yang-library-update
+--ro content-id -> /yang-library/content-id
The "/yang‑library" container holds the entire YANG library. The container has the following child nodes:
Note that for a NETCONF server implementing the NETCONF extensions to support the NMDA [I-D.ietf-netconf-nmda-netconf], a change of the YANG library content identifier results in a new value for the :yang-library:1.1 capability defined in [I-D.ietf-netconf-nmda-netconf]. Thus, if such a server implements NETCONF notifications [RFC5277], and the notification "netconf‑capability‑change" [RFC6470], a "netconf‑capability‑change" notification is generated whenever the YANG library content identifier changes.
The "ietf‑yang‑library" YANG module imports definitions from "ietf‑yang‑types" and "ietf‑inet‑types" defined in [RFC6991] and from "ietf‑datastores" defined in [RFC8342]. While the YANG module is defined using YANG version 1.1, the YANG library supports the YANG modules written in any version of YANG.
RFC Ed.: update the date below with the date of RFC publication and remove this note.
<CODE BEGINS> file "ietf-yang-library@2018-10-16.yang"
module ietf-yang-library {
yang-version 1.1;
namespace "urn:ietf:params:xml:ns:yang:ietf-yang-library";
prefix "yanglib";
import ietf-yang-types {
prefix yang;
reference "RFC 6991: Common YANG Data Types.";
}
import ietf-inet-types {
prefix inet;
reference "RFC 6991: Common YANG Data Types.";
}
import ietf-datastores {
prefix ds;
reference "RFC 8342: Network Management Datastore Architecture.";
}
organization
"IETF NETCONF (Network Configuration) Working Group";
contact
"WG Web: <http://tools.ietf.org/wg/netconf/>
WG List: <mailto:netconf@ietf.org>
Author: Andy Bierman
<mailto:andy@yumaworks.com>
Author: Martin Bjorklund
<mailto:mbj@tail-f.com>
Author: Juergen Schoenwaelder
<mailto:j.schoenwaelder@jacobs-university.de>
Author: Kent Watsen
<mailto:kwatsen@juniper.net>
Author: Rob Wilton
<mailto:rwilton@cisco.com>";
description
"This module provides information about the YANG modules,
datastores, and datastore schemas used by a network
management server.
Copyright (c) 2018 IETF Trust and the persons identified as
authors of the code. All rights reserved.
Redistribution and use in source and binary forms, with or
without modification, is permitted pursuant to, and subject
to the license terms contained in, the Simplified BSD License
set forth in Section 4.c of the IETF Trust's Legal Provisions
Relating to IETF Documents
(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.";
// RFC Ed.: update the date below with the date of RFC publication
// and remove this note.
// RFC Ed.: replace XXXX with actual RFC number and remove this
// note.
revision 2018-10-16 {
description
"Added support for multiple datastores according to the
Network Management Datastore Architecture (NMDA).";
reference
"RFC XXXX: YANG Library.";
}
revision 2016-04-09 {
description
"Initial revision.";
reference
"RFC 7895: YANG Module Library.";
}
/*
* Typedefs
*/
typedef revision-identifier {
type string {
pattern '\d{4}-\d{2}-\d{2}';
}
description
"Represents a specific date in YYYY-MM-DD format.";
}
/*
* Groupings
*/
grouping module-identification-leafs {
description
"Parameters for identifying YANG modules and submodules.";
leaf name {
type yang:yang-identifier;
mandatory true;
description
"The YANG module or submodule name.";
}
leaf revision {
type revision-identifier;
description
"The YANG module or submodule revision date. If no revision
statement is present in the YANG module or submodule, this
leaf is not instantiated.";
}
}
grouping location-leaf-list {
description
"Common location leaf list parameter for modules and
submodules.";
leaf-list location {
type inet:uri;
description
"Contains a URL that represents the YANG schema
resource for this module or submodule.
This leaf will only be present if there is a URL
available for retrieval of the schema for this entry.";
}
}
grouping module-implementation-parameters {
description
"Parameters for describing the implementation of a module.";
leaf-list feature {
type yang:yang-identifier;
description
"List of all YANG feature names from this module that are
supported by the server, regardless whether they are defined
in the module or any included submodule.";
}
leaf-list deviation {
type leafref {
path "../../module/name";
}
description
"List of all YANG deviation modules used by this server to
modify the conformance of the module associated with this
entry. Note that the same module can be used for deviations
for multiple modules, so the same entry MAY appear within
multiple 'module' entries.
This reference MUST NOT (directly or indirectly)
refer to the module being deviated.
Robust clients may want to make sure that they handle a
situation where a module deviates itself (directly or
indirectly) gracefully.";
}
}
grouping module-set-parameters {
description
"A set of parameters that describe a module set.";
leaf name {
type string;
description
"An arbitrary name of the module set.";
}
list module {
key "name";
description
"An entry in this list represents a module implemented by the
server, as per RFC 7950 section 5.6.5, with a particular set
of supported features and deviations.";
reference
"RFC 7950: The YANG 1.1 Data Modeling Language.";
uses module-identification-leafs;
leaf namespace {
type inet:uri;
mandatory true;
description
"The XML namespace identifier for this module.";
}
uses location-leaf-list;
list submodule {
key "name";
description
"Each entry represents one submodule within the
parent module.";
uses module-identification-leafs;
uses location-leaf-list;
}
uses module-implementation-parameters;
}
list import-only-module {
key "name revision";
description
"An entry in this list indicates that the server imports
reusable definitions from the specified revision of the
module, but does not implement any protocol accessible
objects from this revision.
Multiple entries for the same module name MAY exist. This
can occur if multiple modules import the same module, but
specify different revision-dates in the import statements.";
leaf name {
type yang:yang-identifier;
description
"The YANG module name.";
}
leaf revision {
type union {
type revision-identifier;
type string {
length 0;
}
}
description
"The YANG module revision date.
A zero-length string is used if no revision statement
is present in the YANG module.";
}
leaf namespace {
type inet:uri;
mandatory true;
description
"The XML namespace identifier for this module.";
}
uses location-leaf-list;
list submodule {
key "name";
description
"Each entry represents one submodule within the
parent module.";
uses module-identification-leafs;
uses location-leaf-list;
}
}
}
grouping yang-library-parameters {
description
"The YANG library data structure is represented as a grouping
so it can be reused in configuration or another monitoring
data structure.";
list module-set {
key name;
description
"A set of modules that may be used by one or more schemas.
A module set does not have to be referentially complete,
i.e., it may define modules that contain import statements
for other modules not included in the module set.";
uses module-set-parameters;
}
list schema {
key "name";
description
"A datastore schema that may be used by one or more
datastores.
The schema must be valid and referentially complete, i.e.,
it must contain modules to satisfy all used import
statements for all modules specified in the schema.";
leaf name {
type string;
description
"An arbitrary name of the schema.";
}
leaf-list module-set {
type leafref {
path "../../module-set/name";
}
description
"A set of module-sets that are included in this schema.
If a non import-only module appears in multiple module
sets, then the module revision and the associated features
and deviations must be identical.";
}
}
list datastore {
key "name";
description
"A datastore supported by this server.
Each datastore indicates which schema it supports.
The server MUST instantiate one entry in this list per
specific datastore it supports.
Each datstore entry with the same datastore schema SHOULD
reference the same schema.";
leaf name {
type ds:datastore-ref;
description
"The identity of the datastore.";
}
leaf schema {
type leafref {
path "../../schema/name";
}
mandatory true;
description
"A reference to the schema supported by this datastore.
All non import-only modules of the schema are implemented
with their associated features and deviations.";
}
}
}
/*
* Top-level container
*/
container yang-library {
config false;
description
"Container holding the entire YANG library of this server.";
uses yang-library-parameters;
leaf content-id {
type string;
mandatory true;
description
"A server-generated identifier of the contents of the
'yang-library' tree. The server MUST change the value of
this leaf if the information represented by the
'yang-library' tree, except 'yang-library/content-id', has
changed.";
}
}
/*
* Notifications
*/
notification yang-library-update {
description
"Generated when any YANG library information on the
server has changed.";
leaf content-id {
type leafref {
path "/yanglib:yang-library/yanglib:content-id";
}
mandatory true;
description
"Contains the YANG library content identifier for the updated
YANG library at the time the notification is generated.";
}
}
/*
* Legacy groupings
*/
grouping module-list {
status deprecated;
description
"The module data structure is represented as a grouping
so it can be reused in configuration or another monitoring
data structure.";
grouping common-leafs {
status deprecated;
description
"Common parameters for YANG modules and submodules.";
leaf name {
type yang:yang-identifier;
status deprecated;
description
"The YANG module or submodule name.";
}
leaf revision {
type union {
type revision-identifier;
type string {
length 0;
}
}
status deprecated;
description
"The YANG module or submodule revision date.
A zero-length string is used if no revision statement
is present in the YANG module or submodule.";
}
}
grouping schema-leaf {
status deprecated;
description
"Common schema leaf parameter for modules and submodules.";
leaf schema {
type inet:uri;
description
"Contains a URL that represents the YANG schema
resource for this module or submodule.
This leaf will only be present if there is a URL
available for retrieval of the schema for this entry.";
}
}
list module {
key "name revision";
status deprecated;
description
"Each entry represents one revision of one module
currently supported by the server.";
uses common-leafs {
status deprecated;
}
uses schema-leaf {
status deprecated;
}
leaf namespace {
type inet:uri;
mandatory true;
status deprecated;
description
"The XML namespace identifier for this module.";
}
leaf-list feature {
type yang:yang-identifier;
status deprecated;
description
"List of YANG feature names from this module that are
supported by the server, regardless whether they are
defined in the module or any included submodule.";
}
list deviation {
key "name revision";
status deprecated;
description
"List of YANG deviation module names and revisions
used by this server to modify the conformance of
the module associated with this entry. Note that
the same module can be used for deviations for
multiple modules, so the same entry MAY appear
within multiple 'module' entries.
The deviation module MUST be present in the 'module'
list, with the same name and revision values.
The 'conformance-type' value will be 'implement' for
the deviation module.";
uses common-leafs {
status deprecated;
}
}
leaf conformance-type {
type enumeration {
enum implement {
description
"Indicates that the server implements one or more
protocol-accessible objects defined in the YANG module
identified in this entry. This includes deviation
statements defined in the module.
For YANG version 1.1 modules, there is at most one
module entry with conformance type 'implement' for a
particular module name, since YANG 1.1 requires that
at most one revision of a module is implemented.
For YANG version 1 modules, there SHOULD NOT be more
than one module entry for a particular module name.";
}
enum import {
description
"Indicates that the server imports reusable definitions
from the specified revision of the module, but does
not implement any protocol accessible objects from
this revision.
Multiple module entries for the same module name MAY
exist. This can occur if multiple modules import the
same module, but specify different revision-dates in
the import statements.";
}
}
mandatory true;
status deprecated;
description
"Indicates the type of conformance the server is claiming
for the YANG module identified by this entry.";
}
list submodule {
key "name revision";
status deprecated;
description
"Each entry represents one submodule within the
parent module.";
uses common-leafs {
status deprecated;
}
uses schema-leaf {
status deprecated;
}
}
}
}
/*
* Legacy operational state data nodes
*/
container modules-state {
config false;
status deprecated;
description
"Contains YANG module monitoring information.";
leaf module-set-id {
type string;
mandatory true;
status deprecated;
description
"Contains a server-specific identifier representing
the current set of modules and submodules. The
server MUST change the value of this leaf if the
information represented by the 'module' list instances
has changed.";
}
uses module-list {
status deprecated;
}
}
/*
* Legacy notifications
*/
notification yang-library-change {
status deprecated;
description
"Generated when the set of modules and submodules supported
by the server has changed.";
leaf module-set-id {
type leafref {
path "/yanglib:modules-state/yanglib:module-set-id";
}
mandatory true;
status deprecated;
description
"Contains the module-set-id value representing the
set of modules and submodules supported at the server
at the time the notification is generated.";
}
}
}
<CODE ENDS>
RFC 7895 previously registered one URI in the IETF XML registry [RFC3688]. This document takes over this registration entry made by RFC 7895 and changes the Registrant to the IESG according to Section 4 in [RFC3688].
URI: urn:ietf:params:xml:ns:yang:ietf-yang-library Registrant Contact: The IESG. XML: N/A, the requested URI is an XML namespace.
RFC 7895 previously registered one YANG module in the "YANG Module Names" registry [RFC6020] as follows:
name: ietf-yang-library namespace: urn:ietf:params:xml:ns:yang:ietf-yang-library prefix: yanglib reference: RFC 7895
This document takes over this registration entry made by RFC 7895.
The YANG module specified in this document defines a schema for data that is accessed by network management protocols such as NETCONF [RFC6241] or RESTCONF [RFC8040]. The lowest NETCONF layer is the secure transport layer, and the mandatory-to-implement secure transport is Secure Shell (SSH) [RFC6242]. The lowest RESTCONF layer is HTTPS, and the mandatory-to-implement secure transport is TLS [RFC8446].
The NETCONF access control model [RFC8341] provides the means to restrict access for particular NETCONF or RESTCONF users to a preconfigured subset of all available NETCONF or RESTCONF protocol operations and content.
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:
The "/yang‑library" subtree of the YANG library may help an attacker identify the server capabilities and server implementations with known bugs since the set of YANG modules supported by a server may reveal the kind of device and the manufacturer of the device. Although some of this information may be available to all NETCONF users via the NETCONF <hello> message (or similar messages in other management protocols), this YANG module potentially exposes additional details that could be of some assistance to an attacker. Server vulnerabilities may be specific to particular modules, module revisions, module features, or even module deviations. For example, if a particular operation on a particular data node is known to cause a server to crash or significantly degrade device performance, then the module list information will help an attacker identify server implementations with such a defect, in order to launch a denial-of-service attack on the device.
Contributions to this material by Andy Bierman are based upon work supported by the The Space & Terrestrial Communications Directorate (S&TCD) under Contract No. W15P7T-13-C-A616. Any opinions, findings and conclusions or recommendations expressed in this material are those of the author(s) and do not necessarily reflect the views of The Space & Terrestrial Communications Directorate (S&TCD).
| [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., "YANG - A Data Modeling Language for the Network Configuration Protocol (NETCONF)", RFC 6020, DOI 10.17487/RFC6020, October 2010. |
| [RFC6241] | Enns, R., Bjorklund, M., Schoenwaelder, J. and A. Bierman, "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. |
| [RFC6991] | Schoenwaelder, J., "Common YANG Data Types", RFC 6991, DOI 10.17487/RFC6991, July 2013. |
| [RFC7950] | Bjorklund, M., "The YANG 1.1 Data Modeling Language", RFC 7950, DOI 10.17487/RFC7950, August 2016. |
| [RFC8040] | Bierman, A., Bjorklund, M. and K. Watsen, "RESTCONF Protocol", RFC 8040, DOI 10.17487/RFC8040, January 2017. |
| [RFC8174] | Leiba, B., "Ambiguity of Uppercase vs Lowercase in RFC 2119 Key Words", BCP 14, RFC 8174, DOI 10.17487/RFC8174, May 2017. |
| [RFC8341] | Bierman, A. and M. Bjorklund, "Network Configuration Access Control Model", STD 91, RFC 8341, DOI 10.17487/RFC8341, March 2018. |
| [RFC8342] | Bjorklund, M., Schoenwaelder, J., Shafer, P., Watsen, K. and R. Wilton, "Network Management Datastore Architecture (NMDA)", RFC 8342, DOI 10.17487/RFC8342, March 2018. |
| [RFC8446] | Rescorla, E., "The Transport Layer Security (TLS) Protocol Version 1.3", RFC 8446, DOI 10.17487/RFC8446, August 2018. |
| [I-D.ietf-netconf-nmda-netconf] | Bjorklund, M., Schoenwaelder, J., Shafer, P., Watsen, K. and R. Wilton, "NETCONF Extensions to Support the Network Management Datastore Architecture", Internet-Draft draft-ietf-netconf-nmda-netconf-07, October 2018. |
| [I-D.ietf-netconf-nmda-restconf] | Bjorklund, M., Schoenwaelder, J., Shafer, P., Watsen, K. and R. Wilton, "RESTCONF Extensions to Support the Network Management Datastore Architecture", Internet-Draft draft-ietf-netconf-nmda-restconf-05, October 2018. |
| [I-D.ietf-netmod-schema-mount] | Bjorklund, M. and L. Lhotka, "YANG Schema Mount", Internet-Draft draft-ietf-netmod-schema-mount-11, August 2018. |
| [RFC5277] | Chisholm, S. and H. Trevino, "NETCONF Event Notifications", RFC 5277, DOI 10.17487/RFC5277, July 2008. |
| [RFC6470] | Bierman, A., "Network Configuration Protocol (NETCONF) Base Notifications", RFC 6470, DOI 10.17487/RFC6470, February 2012. |
| [RFC7895] | Bierman, A., Bjorklund, M. and K. Watsen, "YANG Module Library", RFC 7895, DOI 10.17487/RFC7895, June 2016. |
| [RFC8340] | Bjorklund, M. and L. Berger, "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. |
| [RFC8344] | Bjorklund, M., "A YANG Data Model for IP Management", RFC 8344, DOI 10.17487/RFC8344, March 2018. |
| [RFC8345] | Clemm, A., Medved, J., Varga, R., Bahadur, N., Ananthakrishnan, H. and X. Liu, "A YANG Data Model for Network Topologies", RFC 8345, DOI 10.17487/RFC8345, March 2018. |
| [RFC8348] | Bierman, A., Bjorklund, M., Dong, J. and D. Romascanu, "A YANG Data Model for Hardware Management", RFC 8348, DOI 10.17487/RFC8348, March 2018. |
| [RFC8349] | Lhotka, L., Lindem, A. and Y. Qu, "A YANG Data Model for Routing Management (NMDA Version)", RFC 8349, DOI 10.17487/RFC8349, March 2018. |
This document updates [RFC7895] in the following ways:
The following example shows the YANG Library of a basic server implementing the "ietf‑interfaces" [RFC8343] and "ietf‑ip" [RFC8344] modules in the <running>, <startup>, and <operational> datastores and the "ietf‑hardware" [RFC8348] module in the <operational> datastore.
Newlines in leaf values are added for formatting reasons.
<yang-library
xmlns="urn:ietf:params:xml:ns:yang:ietf-yang-library"
xmlns:ds="urn:ietf:params:xml:ns:yang:ietf-datastores">
<module-set>
<name>config-modules</name>
<module>
<name>ietf-interfaces</name>
<revision>2018-01-09</revision> <!-- RFC Ed. update this -->
<namespace>
urn:ietf:params:xml:ns:yang:ietf-interfaces
</namespace>
</module>
<module>
<name>ietf-ip</name>
<revision>2018-01-09</revision> <!-- RFC Ed. update this -->
<namespace>
urn:ietf:params:xml:ns:yang:ietf-ip
</namespace>
</module>
<import-only-module>
<name>ietf-yang-types</name>
<revision>2013-07-15</revision>
<namespace>
urn:ietf:params:xml:ns:yang:ietf-yang-types
</namespace>
</import-only-module>
<import-only-module>
<name>ietf-inet-types</name>
<revision>2013-07-15</revision>
<namespace>
urn:ietf:params:xml:ns:yang:ietf-inet-types
</namespace>
</import-only-module>
</module-set>
<module-set>
<name>state-modules</name>
<module>
<name>ietf-hardware</name>
<revision>2018-12-18</revision> <!-- RFC Ed. update this -->
<namespace>
urn:ietf:params:xml:ns:yang:ietf-hardware
</namespace>
</module>
<import-only-module>
<name>ietf-inet-types</name>
<revision>2013-07-15</revision>
<namespace>
urn:ietf:params:xml:ns:yang:ietf-inet-types
</namespace>
</import-only-module>
<import-only-module>
<name>ietf-yang-types</name>
<revision>2013-07-15</revision>
<namespace>
urn:ietf:params:xml:ns:yang:ietf-yang-types
</namespace>
</import-only-module>
<import-only-module>
<name>iana-hardware</name>
<revision>2017-12-18</revision> <!-- RFC Ed. update this -->
<namespace>
urn:ietf:params:xml:ns:yang:iana-hardware
</namespace>
</import-only-module>
</module-set>
<schema>
<name>config-schema</name>
<module-set>config-modules</module-set>
</schema>
<schema>
<name>state-schema</name>
<module-set>config-modules</module-set>
<module-set>state-modules</module-set>
</schema>
<datastore>
<name>ds:startup</name>
<schema>config-schema</schema>
</datastore>
<datastore>
<name>ds:running</name>
<schema>config-schema</schema>
</datastore>
<datastore>
<name>ds:operational</name>
<schema>state-schema</schema>
</datastore>
<content-id>75a43df9bd56b92aacc156a2958fbe12312fb285</content-id>
</yang-library>
The following example extends the preceding Basic Server YANG Library example, by using modules from [RFC8345] and [RFC8349], to illustrate a slightly more advanced server that:
<yang-library
xmlns="urn:ietf:params:xml:ns:yang:ietf-yang-library"
xmlns:ds="urn:ietf:params:xml:ns:yang:ietf-datastores"
xmlns:ex-ds-eph="urn:example:ds-ephemeral">
<module-set>
<name>config-state-modules</name>
<module>
<name>ietf-interfaces</name>
<revision>2018-01-09</revision> <!-- RFC Ed. update this -->
<namespace>
urn:ietf:params:xml:ns:yang:ietf-interfaces
</namespace>
</module>
<module>
<name>ietf-ip</name>
<revision>2018-01-09</revision> <!-- RFC Ed. update this -->
<namespace>
urn:ietf:params:xml:ns:yang:ietf-ip
</namespace>
</module>
<module>
<name>ietf-routing</name>
<revision>2018-01-25</revision> <!-- RFC Ed. update this -->
<namespace>
urn:ietf:params:xml:ns:yang:ietf-routing
</namespace>
</module>
<import-only-module>
<name>ietf-yang-types</name>
<revision>2013-07-15</revision>
<namespace>
urn:ietf:params:xml:ns:yang:ietf-yang-types
</namespace>
</import-only-module>
<import-only-module>
<name>ietf-inet-types</name>
<revision>2013-07-15</revision>
<namespace>
urn:ietf:params:xml:ns:yang:ietf-inet-types
</namespace>
</import-only-module>
</module-set>
<module-set>
<name>config-only-modules</name>
<module>
<name>ietf-routing</name>
<revision>2018-01-25</revision> <!-- RFC Ed. update this -->
<namespace>
urn:ietf:params:xml:ns:yang:ietf-routing
</namespace>
</module>
</module-set>
<module-set>
<name>dynamic-config-state-modules</name>
<module>
<name>ietf-network</name>
<revision>2017-12-18</revision> <!-- RFC Ed. update this -->
<namespace>
urn:ietf:params:xml:ns:yang:ietf-network
</namespace>
</module>
<module>
<name>ietf-network-topology</name>
<revision>2017-12-18</revision> <!-- RFC Ed. update this -->
<namespace>
urn:ietf:params:xml:ns:yang:ietf-network-topology
</namespace>
</module>
<import-only-module>
<name>ietf-inet-types</name>
<revision>2013-07-15</revision>
<namespace>
urn:ietf:params:xml:ns:yang:ietf-inet-types
</namespace>
</import-only-module>
</module-set>
<module-set>
<name>state-only-modules</name>
<module>
<name>ietf-hardware</name>
<revision>2018-12-18</revision> <!-- RFC Ed. update this -->
<namespace>
urn:ietf:params:xml:ns:yang:ietf-hardware
</namespace>
<deviation>example-vendor-hardware-deviations</deviation>
</module>
<module>
<name>ietf-routing</name>
<revision>2018-01-25</revision> <!-- RFC Ed. update this -->
<namespace>
urn:ietf:params:xml:ns:yang:ietf-routing
</namespace>
<feature>multiple-ribs</feature>
<feature>router-id</feature>
</module>
<module>
<name>example-vendor-hardware-deviations</name>
<revision>2018-01-31</revision>
<namespace>
urn:example:example-vendor-hardware-deviations
</namespace>
</module>
<import-only-module>
<name>ietf-inet-types</name>
<revision>2013-07-15</revision>
<namespace>
urn:ietf:params:xml:ns:yang:ietf-inet-types
</namespace>
</import-only-module>
<import-only-module>
<name>ietf-yang-types</name>
<revision>2013-07-15</revision>
<namespace>
urn:ietf:params:xml:ns:yang:ietf-yang-types
</namespace>
</import-only-module>
<import-only-module>
<name>iana-hardware</name>
<revision>2017-12-18</revision> <!-- RFC Ed. update this -->
<namespace>
urn:ietf:params:xml:ns:yang:iana-hardware
</namespace>
</import-only-module>
</module-set>
<schema>
<name>config-schema</name>
<module-set>config-state-modules</module-set>
<module-set>config-only-modules</module-set>
</schema>
<schema>
<name>dynamic-config-schema</name>
<module-set>dynamic-config-state-modules</module-set>
</schema>
<schema>
<name>state-schema</name>
<module-set>config-state-modules</module-set>
<module-set>dynamic-config-state-modules</module-set>
<module-set>state-only-modules</module-set>
</schema>
<datastore>
<name>ds:startup</name>
<schema>config-schema</schema>
</datastore>
<datastore>
<name>ds:running</name>
<schema>config-schema</schema>
</datastore>
<datastore>
<name>ex-ds-eph:ds-ephemeral</name>
<schema>dynamic-config-schema</schema>
</datastore>
<datastore>
<name>ds:operational</name>
<schema>state-schema</schema>
</datastore>
<content-id>14782ab9bd56b92aacc156a2958fbe12312fb285</content-id>
</yang-library>