Internet Engineering Task Force (IETF) M. Scott
Request for Comments: 6022 Ericsson
Category: Standards Track M. Bjorklund
ISSN: 2070-1721 Tail-f Systems
October 2010
YANG Module for NETCONF Monitoring
Abstract
This document defines a Network Configuration Protocol (NETCONF) data
model to be used to monitor the NETCONF protocol. The monitoring
data model includes information about NETCONF datastores, sessions,
locks, and statistics. This data facilitates the management of a
NETCONF server. This document also defines methods for NETCONF
clients to discover data models supported by a NETCONF server and
defines a new NETCONF <get-schema> operation to retrieve them.
Status of This Memo
This is an Internet Standards Track document.
This document is a product of the Internet Engineering Task Force
(IETF). It represents the consensus of the IETF community. It has
received public review and has been approved for publication by the
Internet Engineering Steering Group (IESG). Further information on
Internet Standards is available in Section 2 of RFC 5741.
Information about the current status of this document, any errata,
and how to provide feedback on it may be obtained at
http://www.rfc-editor.org/info/rfc6022.
Copyright Notice
Copyright (c) 2010 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
(http://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.
Scott & Bjorklund Standards Track [Page 1]
RFC 6022 YANG Module for NETCONF Monitoring October 2010 This document may contain material from IETF Documents or IETF Contributions published or made publicly available before November 10, 2008. The person(s) controlling the copyright in some of this material may not have granted the IETF Trust the right to allow modifications of such material outside the IETF Standards Process. Without obtaining an adequate license from the person(s) controlling the copyright in such materials, this document may not be modified outside the IETF Standards Process, and derivative works of it may not be created outside the IETF Standards Process, except to format it for publication as an RFC or to translate it into languages other than English. Table of Contents 1. Introduction ....................................................3 1.1. Definition of Terms ........................................3 2. Data Model to Monitor NETCONF ...................................3 2.1. The /netconf-state Subtree .................................3 2.1.1. The /netconf-state/capabilities Subtree .............4 2.1.2. The /netconf-state/datastores Subtree ...............4 2.1.3. The /netconf-state/schemas Subtree ..................5 2.1.4. The /netconf-state/sessions Subtree .................6 2.1.5. The /netconf-state/statistics Subtree ...............7 3. Schema Specific Operations ......................................8 3.1. The <get-schema> Operation .................................8 4. Examples ........................................................9 4.1. Retrieving Schema List via <get> Operation .................9 4.2. Retrieving Schema Instances ...............................11 5. NETCONF Monitoring Data Model ..................................13 6. Security Considerations ........................................25 7. Acknowledgements ...............................................26 8. IANA Considerations ............................................26 9. References .....................................................26 9.1. Normative References ......................................26 9.2. Informative References ....................................27 Scott & Bjorklund Standards Track [Page 2]
RFC 6022 YANG Module for NETCONF Monitoring October 2010 1. Introduction This document defines a YANG [RFC6020] model to be used to monitor the NETCONF protocol. It provides information about NETCONF sessions and supported schema as defined in [RFC4741]. Considerations such as different schema formats, feature optionality, and access controls can all impact the applicability and level of detail the NETCONF server sends to a client during session setup. The methods defined in this document address the need for further means to query and retrieve schema and NETCONF state information from a NETCONF server. These are provided to complement existing base NETCONF capabilities and operations and in no way affect existing behaviour. A new <get-schema> operation is also defined to support explicit schema retrieval via NETCONF. 1.1. Definition of Terms 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]. 2. Data Model to Monitor NETCONF The NETCONF monitoring data model defined in this document provides operational information on the NETCONF server. This includes details specific to the NETCONF protocol (e.g., protocol-specific counters such as 'in-sessions') as well as data related to schema retrieval (e.g., schema list). A server that implements the data model defined in this document ("urn:ietf:params:xml:ns:yang:ietf-netconf-monitoring") MUST advertise the capability URI as described in [RFC6020]. This section presents an overview of the monitoring data model. For detailed descriptions, refer to the normative YANG module provided in this document (see Section 5). 2.1. The /netconf-state Subtree The netconf-state container is the root of the monitoring data model. Scott & Bjorklund Standards Track [Page 3]
RFC 6022 YANG Module for NETCONF Monitoring October 2010 netconf-state /capabilities /datastores /schemas /sessions /statistics capabilities List of NETCONF capabilities supported by the server. datastores List of NETCONF configuration datastores (e.g., running, startup, candidate) supported on this device and related information. schemas List of schemas supported on the server. Includes all the information required to identify the schemas and to support their retrieval. sessions List of all active NETCONF sessions on the device. Includes per- session counters for all NETCONF sessions. statistics Includes global counters for the NETCONF server. 2.1.1. The /netconf-state/capabilities Subtree The /netconf-state/capabilities subtree contains the capabilities supported by the NETCONF server. The list MUST include all capabilities exchanged during session setup still applicable at the time of the request. 2.1.2. The /netconf-state/datastores Subtree The /netconf-state/datastores subtree contains the list of available datastores for the NETCONF server and includes information on their lock state. datastore /name /locks name (leaf, netconf-datastore-type) Enumeration of supported datastores; candidate, running, startup. Scott & Bjorklund Standards Track [Page 4]
RFC 6022 YANG Module for NETCONF Monitoring October 2010 locks (grouping, lock-info) List of locks for the datastore. Information is provided for both global and partial locks [RFC5717]. For partial locks, the list of locked nodes and the select expressions originally used to request the lock are returned. 2.1.3. The /netconf-state/schemas Subtree The list of supported schema for the NETCONF server. schema /identifier (key) /version (key) /format (key) /namespace /location The elements identifier, version, and format are used as a key in the schema list. These are used in the <get-schema> operation. identifier (string) Identifier for the schema list entry. The identifier is used in the <get-schema> operation and may be used for other means such as file retrieval. version (string) Version of the schema supported. Multiple versions MAY be supported simultaneously by a NETCONF server. Each version MUST be reported individually in the schema list, i.e., with same identifier, possibly different location, but different version. For YANG data models, version is the value of the most recent YANG 'revision' statement in the module or submodule, or the empty string if no 'revision' statement is present. format (identifyref, schema-format) The data modeling language the schema is written in. The data modeling language is represented as a YANG identity. This document defines the identities "xsd", "yang", "yin", "rng", and "rnc" (see Section 5). namespace (inet:uri) The Extensible Markup Language (XML) namespace [XML-NAMES] defined by the schema. Scott & Bjorklund Standards Track [Page 5]
RFC 6022 YANG Module for NETCONF Monitoring October 2010 location (union: enum, inet:uri) One or more locations from which this specific schema can be retrieved. The list SHOULD contain at least one entry per schema. 2.1.4. The /netconf-state/sessions Subtree Includes session-specific data for NETCONF management sessions. The session list MUST include all currently active NETCONF sessions. session /session-id (key) /transport /username /source-host /login-time /in-rpcs /in-bad-rpcs /out-rpc-errors /out-notifications session-id (uint32, 1..max) Unique identifier for the session. This value is the NETCONF session identifier, as defined in [RFC4741]. transport (identityref, transport) Identifies the transport for each session. The transport is represented as a YANG identity. This document defines the identities "netconf-ssh", "netconf-soap-over-beep", "netconf-soap- over-https", "netconf-beep", and "netconf-tls" (see Section 5). username (string) The username is the client identity that was authenticated by the NETCONF transport protocol. The algorithm used to derive the username is NETCONF transport protocol specific and in addition specific to the authentication mechanism used by the NETCONF transport protocol. source-host (inet:host) Host identifier (IP address or name) of the NETCONF client. login-time (yang:date-and-time) Time at the server at which the session was established. in-rpcs (yang:zero-based-counter32) Number of correct <rpc> messages received. Scott & Bjorklund Standards Track [Page 6]
RFC 6022 YANG Module for NETCONF Monitoring October 2010 in-bad-rpcs (yang:zero-based-counter32) Number of messages received when an <rpc> message was expected, that were not correct <rpc> messages. This includes XML parse errors and errors on the rpc layer. out-rpc-errors (yang:zero-based-counter32) Number of <rpc-reply> messages sent that contained an <rpc-error> element. out-notifications (yang:zero-based-counter32) Number of <notification> messages sent. 2.1.5. The /netconf-state/statistics Subtree Statistical data pertaining to the NETCONF server. statistics /netconf-start-time /in-bad-hellos /in-sessions /dropped-sessions /in-rpcs /in-bad-rpcs /out-rpc-errors /out-notifications statistics: Contains management-session-related performance data for the NETCONF server. netconf-start-time (yang:date-and-time) Date and time at which the management subsystem was started. in-bad-hellos (yang:zero-based-counter32) Number of sessions silently dropped because an invalid <hello> message was received. in-sessions (yang:zero-based-counter32) Number of sessions started. dropped-sessions (yang:zero-based-counter32) Number of sessions that were abnormally terminated, e.g., due to idle timeout or transport close. in-rpcs (yang:zero-based-counter32) Number of correct <rpc> messages received. Scott & Bjorklund Standards Track [Page 7]
RFC 6022 YANG Module for NETCONF Monitoring October 2010 in-bad-rpcs (yang:zero-based-counter32) Number of messages received when an <rpc> message was expected, which were not correct <rpc> messages. out-rpc-errors (yang:zero-based-counter32) Number of <rpc-reply> messages sent that contained an <rpc-error> element. out-notifications (yang:zero-based-counter32) Number of <notification> messages sent. 3. Schema Specific Operations 3.1. The <get-schema> Operation Description: This operation is used to retrieve a schema from the NETCONF server. Parameters: identifier (string): Identifier for the schema list entry. Mandatory parameter. version (string): Version of the schema requested. Optional parameter. format (identityref, schema-format): The data modeling language of the schema. Default value is 'yang' when not specified. Optional parameter. Positive Response: The NETCONF server returns the requested schema. Negative Response: If the requested schema does not exist, the <error-tag> is 'invalid-value'. If more than one schema matches the requested parameters, the <error-tag> is 'operation-failed', and <error-app-tag> is 'data-not-unique'. Scott & Bjorklund Standards Track [Page 8]
RFC 6022 YANG Module for NETCONF Monitoring October 2010 4. Examples 4.1. Retrieving Schema List via <get> Operation A NETCONF client retrieves the list of supported schema from a NETCONF server by retrieving the /netconf-state/schemas subtree via a <get> operation. Available schema for the requesting session are returned in the reply containing the <identifier>, <version>, <format>, and <location> elements. The response data can be used to determine the available schema and their versions. The schema itself (i.e., schema content) is not returned in the response. The optional <location> element contains a URI, which can be used to retrieve the schema by another protocol such as ftp [RFC0959] or http(s) [RFC2616] [RFC2818], or the special value 'NETCONF', which means that the schema can be retrieved from the device via the <get-schema> operation. Example: <rpc message-id="101" xmlns="urn:ietf:params:xml:ns:netconf:base:1.0"> <get> <filter type="subtree"> <netconf-state xmlns= "urn:ietf:params:xml:ns:yang:ietf-netconf-monitoring"> <schemas/> </netconf-state> </filter> </get> </rpc> The NETCONF server returns a list of schema available for retrieval. Scott & Bjorklund Standards Track [Page 9]
RFC 6022 YANG Module for NETCONF Monitoring October 2010 <rpc-reply message-id="101" xmlns="urn:ietf:params:xml:ns:netconf:base:1.0"> <data> <netconf-state xmlns="urn:ietf:params:xml:ns:yang:ietf-netconf-monitoring"> <schemas> <schema> <identifier>foo</identifier> <version>1.0</version> <format>xsd</format> <namespace>http://example.com/foo</namespace> <location>ftp://ftp.example.com/schemas/foo_1.0.xsd</location> <location>http://www.example.com/schema/foo_1.0.xsd</location> <location>NETCONF</location> </schema> <schema> <identifier>foo</identifier> <version>1.1</version> <format>xsd</format> <namespace>http://example.com/foo</namespace> <location>ftp://ftp.example.com/schemas/foo_1.1.xsd</location> <location>http://www.example.com/schema/foo_1.1.xsd</location> <location>NETCONF</location> </schema> <schema> <identifier>bar</identifier> <version>2008-06-01</version> <format>yang</format> <namespace>http://example.com/bar</namespace> <location> http://example.com/schema/bar@2008-06-01.yang </location> <location>NETCONF</location> </schema> <schema> <identifier>bar-types</identifier> <version>2008-06-01</version> <format>yang</format> <namespace>http://example.com/bar</namespace> <location> http://example.com/schema/bar-types@2008-06-01.yang </location> <location>NETCONF</location> </schema> </schemas> </netconf-state> </data> </rpc-reply> Scott & Bjorklund Standards Track [Page 10]
RFC 6022 YANG Module for NETCONF Monitoring October 2010 4.2. Retrieving Schema Instances Given the reply in the previous section, the following examples illustrate the retrieval of 'foo', 'bar', and 'bar-types' schema at multiple locations, with multiple formats, and in multiple locations. 1. foo, version 1.0 in xsd format: a. Via FTP using location ftp://ftp.example.com/schemas/foo_1.0.xsd b. Via HTTP using location http://www.example.com/schema/foo_1.0.xsd c. Via <get-schema> using identifier, version, and format parameters. <rpc message-id="101" xmlns="urn:ietf:params:xml:ns:netconf:base:1.0"> <get-schema xmlns="urn:ietf:params:xml:ns:yang:ietf-netconf-monitoring"> <identifier>foo</identifier> <version>1.0</version> <format>xsd</format> </get-schema> </rpc> <rpc-reply message-id="101" xmlns="urn:ietf:params:xml:ns:netconf:base:1.0"> <data xmlns="urn:ietf:params:xml:ns:yang:ietf-netconf-monitoring"> <xs:schema xmlns:xs="http://www.w3.org/2001/XMLSchema"> <!-- foo 1.0 xsd schema contents here --> </xs:schema> </data> </rpc-reply> 2. bar, version 2008-06-01 in YANG format: a. Via HTTP using location http://example.com/schema/bar@2008-06-01.yang b. Via <get-schema> using identifier and version parameters: Scott & Bjorklund Standards Track [Page 11]
RFC 6022 YANG Module for NETCONF Monitoring October 2010 <rpc message-id="102" xmlns="urn:ietf:params:xml:ns:netconf:base:1.0"> <get-schema xmlns="urn:ietf:params:xml:ns:yang:ietf-netconf-monitoring"> <identifer>bar</identifer> <version>2008-06-01</version> </get-schema> </rpc> <rpc-reply message-id="102" xmlns="urn:ietf:params:xml:ns:netconf:base:1.0"> <data xmlns="urn:ietf:params:xml:ns:yang:ietf-netconf-monitoring"> module bar { //default format (yang) returned //bar version 2008-06-01 yang module //contents here ... } </data> </rpc-reply> 3. bar-types, version 2008-06-01 in default YANG format: a. Via <get-schema> using identifer parameter: <rpc message-id="103" xmlns="urn:ietf:params:xml:ns:netconf:base:1.0"> <get-schema xmlns="urn:ietf:params:xml:ns:yang:ietf-netconf-monitoring"> <identifer>bar-types</identifer> </get-schema> </rpc> <rpc-reply message-id="103" xmlns="urn:ietf:params:xml:ns:netconf:base:1.0"> <data xmlns="urn:ietf:params:xml:ns:yang:ietf-netconf-monitoring"> module bar-types { //default format (yang) returned //latest revision returned //is version 2008-06-01 yang module //contents here ... } </data> </rpc-reply> Scott & Bjorklund Standards Track [Page 12]
RFC 6022 YANG Module for NETCONF Monitoring October 2010 5. NETCONF Monitoring Data Model The data model described in this memo is defined in the following YANG module. This YANG module imports typedefs from [RFC6021] and references [RFC4741], [RFC4742], [RFC4743], [RFC4744], [RFC5539], [xmlschema-1], [RFC6020], [ISO/IEC19757-2:2008], and [RFC5717]. <CODE BEGINS> file "ietf-netconf-monitoring@2010-10-04.yang" module ietf-netconf-monitoring { namespace "urn:ietf:params:xml:ns:yang:ietf-netconf-monitoring"; prefix "ncm"; import ietf-yang-types { prefix yang; } import ietf-inet-types { prefix inet; } organization "IETF NETCONF (Network Configuration) Working Group"; contact "WG Web: <http://tools.ietf.org/wg/netconf/> WG List: <mailto:netconf@ietf.org> WG Chair: Mehmet Ersue <mailto:mehmet.ersue@nsn.com> WG Chair: Bert Wijnen <mailto:bertietf@bwijnen.net> Editor: Mark Scott <mailto:mark.scott@ericsson.com> Editor: Martin Bjorklund <mailto:mbj@tail-f.com>"; description "NETCONF Monitoring Module. All elements in this module are read-only. Copyright (c) 2010 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 Scott & Bjorklund Standards Track [Page 13]
RFC 6022 YANG Module for NETCONF Monitoring October 2010 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 6022; see the RFC itself for full legal notices."; revision 2010-10-04 { description "Initial revision."; reference "RFC 6022: YANG Module for NETCONF Monitoring"; } typedef netconf-datastore-type { type enumeration { enum running; enum candidate; enum startup; } description "Enumeration of possible NETCONF datastore types."; reference "RFC 4741: NETCONF Configuration Protocol"; } identity transport { description "Base identity for NETCONF transport types."; } identity netconf-ssh { base transport; description "NETCONF over Secure Shell (SSH)."; reference "RFC 4742: Using the NETCONF Configuration Protocol over Secure SHell (SSH)"; } identity netconf-soap-over-beep { base transport; description "NETCONF over Simple Object Access Protocol (SOAP) over Blocks Extensible Exchange Protocol (BEEP)."; Scott & Bjorklund Standards Track [Page 14]
RFC 6022 YANG Module for NETCONF Monitoring October 2010 reference "RFC 4743: Using NETCONF over the Simple Object Access Protocol (SOAP)"; } identity netconf-soap-over-https { base transport; description "NETCONF over Simple Object Access Protocol (SOAP) over Hypertext Transfer Protocol Secure (HTTPS)."; reference "RFC 4743: Using NETCONF over the Simple Object Access Protocol (SOAP)"; } identity netconf-beep { base transport; description "NETCONF over Blocks Extensible Exchange Protocol (BEEP)."; reference "RFC 4744: Using the NETCONF Protocol over the Blocks Extensible Exchange Protocol (BEEP)"; } identity netconf-tls { base transport; description "NETCONF over Transport Layer Security (TLS)."; reference "RFC 5539: NETCONF over Transport Layer Security (TLS)"; } identity schema-format { description "Base identity for data model schema languages."; } identity xsd { base schema-format; description "W3C XML Schema Definition."; reference "W3C REC REC-xmlschema-1-20041028: XML Schema Part 1: Structures"; } Scott & Bjorklund Standards Track [Page 15]
RFC 6022 YANG Module for NETCONF Monitoring October 2010 identity yang { base schema-format; description "The YANG data modeling language for NETCONF."; reference "RFC 6020: YANG - A Data Modeling Language for the Network Configuration Protocol (NETCONF)"; } identity yin { base schema-format; description "The YIN syntax for YANG."; reference "RFC 6020: YANG - A Data Modeling Language for the Network Configuration Protocol (NETCONF)"; } identity rng { base schema-format; description "Regular Language for XML Next Generation (RELAX NG)."; reference "ISO/IEC 19757-2:2008: RELAX NG"; } identity rnc { base schema-format; description "Relax NG Compact Syntax"; reference "ISO/IEC 19757-2:2008: RELAX NG"; } grouping common-counters { description "Counters that exist both per session, and also globally, accumulated from all sessions."; leaf in-rpcs { type yang:zero-based-counter32; description "Number of correct <rpc> messages received."; } leaf in-bad-rpcs { type yang:zero-based-counter32; Scott & Bjorklund Standards Track [Page 16]
RFC 6022 YANG Module for NETCONF Monitoring October 2010 description "Number of messages received when an <rpc> message was expected, that were not correct <rpc> messages. This includes XML parse errors and errors on the rpc layer."; } leaf out-rpc-errors { type yang:zero-based-counter32; description "Number of <rpc-reply> messages sent that contained an <rpc-error> element."; } leaf out-notifications { type yang:zero-based-counter32; description "Number of <notification> messages sent."; } } container netconf-state { config false; description "The netconf-state container is the root of the monitoring data model."; container capabilities { description "Contains the list of NETCONF capabilities supported by the server."; leaf-list capability { type inet:uri; description "List of NETCONF capabilities supported by the server."; } } container datastores { description "Contains the list of NETCONF configuration datastores."; list datastore { key name; description "List of NETCONF configuration datastores supported by the NETCONF server and related information."; leaf name { type netconf-datastore-type; Scott & Bjorklund Standards Track [Page 17]
RFC 6022 YANG Module for NETCONF Monitoring October 2010 description "Name of the datastore associated with this list entry."; } container locks { presence "This container is present only if the datastore is locked."; description "The NETCONF <lock> and <partial-lock> operations allow a client to lock specific resources in a datastore. The NETCONF server will prevent changes to the locked resources by all sessions except the one that acquired the lock(s). Monitoring information is provided for each datastore entry including details such as the session that acquired the lock, the type of lock (global or partial) and the list of locked resources. Multiple locks per datastore are supported."; grouping lock-info { description "Lock related parameters, common to both global and partial locks."; leaf locked-by-session { type uint32; mandatory true; description "The session ID of the session that has locked this resource. Both a global lock and a partial lock MUST contain the NETCONF session-id. If the lock is held by a session that is not managed by the NETCONF server (e.g., a CLI session), a session id of 0 (zero) is reported."; reference "RFC 4741: NETCONF Configuration Protocol"; } leaf locked-time { type yang:date-and-time; mandatory true; description "The date and time of when the resource was locked."; } } Scott & Bjorklund Standards Track [Page 18]
RFC 6022 YANG Module for NETCONF Monitoring October 2010 choice lock-type { description "Indicates if a global lock or a set of partial locks are set."; container global-lock { description "Present if the global lock is set."; uses lock-info; } list partial-lock { key lock-id; description "List of partial locks."; reference "RFC 5717: Partial Lock Remote Procedure Call (RPC) for NETCONF"; leaf lock-id { type uint32; description "This is the lock id returned in the <partial-lock> response."; } uses lock-info; leaf-list select { type yang:xpath1.0; min-elements 1; description "The xpath expression that was used to request the lock. The select expression indicates the original intended scope of the lock."; } leaf-list locked-node { type instance-identifier; description "The list of instance-identifiers (i.e., the locked nodes). The scope of the partial lock is defined by the list of locked nodes."; } } } } } } Scott & Bjorklund Standards Track [Page 19]
RFC 6022 YANG Module for NETCONF Monitoring October 2010 container schemas { description "Contains the list of data model schemas supported by the server."; list schema { key "identifier version format"; description "List of data model schemas supported by the server."; leaf identifier { type string; description "Identifier to uniquely reference the schema. The identifier is used in the <get-schema> operation and may be used for other purposes such as file retrieval. For modeling languages that support or require a data model name (e.g., YANG module name) the identifier MUST match that name. For YANG data models, the identifier is the name of the module or submodule. In other cases, an identifier such as a filename MAY be used instead."; } leaf version { type string; description "Version of the schema supported. Multiple versions MAY be supported simultaneously by a NETCONF server. Each version MUST be reported individually in the schema list, i.e., with same identifier, possibly different location, but different version. For YANG data models, version is the value of the most recent YANG 'revision' statement in the module or submodule, or the empty string if no 'revision' statement is present."; } leaf format { type identityref { base schema-format; } description "The data modeling language the schema is written in (currently xsd, yang, yin, rng, or rnc). Scott & Bjorklund Standards Track [Page 20]
RFC 6022 YANG Module for NETCONF Monitoring October 2010 For YANG data models, 'yang' format MUST be supported and 'yin' format MAY also be provided."; } leaf namespace { type inet:uri; mandatory true; description "The XML namespace defined by the data model. For YANG data models, this is the module's namespace. If the list entry describes a submodule, this field contains the namespace of the module to which the submodule belongs."; } leaf-list location { type union { type enumeration { enum "NETCONF"; } type inet:uri; } description "One or more locations from which the schema can be retrieved. This list SHOULD contain at least one entry per schema. A schema entry may be located on a remote file system (e.g., reference to file system for ftp retrieval) or retrieved directly from a server supporting the <get-schema> operation (denoted by the value 'NETCONF')."; } } } Scott & Bjorklund Standards Track [Page 21]
RFC 6022 YANG Module for NETCONF Monitoring October 2010 container sessions { description "The sessions container includes session-specific data for NETCONF management sessions. The session list MUST include all currently active NETCONF sessions."; list session { key session-id; description "All NETCONF sessions managed by the NETCONF server MUST be reported in this list."; leaf session-id { type uint32 { range "1..max"; } description "Unique identifier for the session. This value is the NETCONF session identifier, as defined in RFC 4741."; reference "RFC 4741: NETCONF Configuration Protocol"; } leaf transport { type identityref { base transport; } mandatory true; description "Identifies the transport for each session, e.g., 'netconf-ssh', 'netconf-soap', etc."; } leaf username { type string; mandatory true; description "The username is the client identity that was authenticated by the NETCONF transport protocol. The algorithm used to derive the username is NETCONF transport protocol specific and in addition specific to the authentication mechanism used by the NETCONF transport protocol."; } leaf source-host { type inet:host; description "Host identifier of the NETCONF client. The value returned is implementation specific (e.g., hostname, IPv4 address, IPv6 address)"; } Scott & Bjorklund Standards Track [Page 22]
RFC 6022 YANG Module for NETCONF Monitoring October 2010 leaf login-time { type yang:date-and-time; mandatory true; description "Time at the server at which the session was established."; } uses common-counters { description "Per-session counters. Zero based with following reset behaviour: - at start of a session - when max value is reached"; } } } container statistics { description "Statistical data pertaining to the NETCONF server."; leaf netconf-start-time { type yang:date-and-time; description "Date and time at which the management subsystem was started."; } leaf in-bad-hellos { type yang:zero-based-counter32; description "Number of sessions silently dropped because an invalid <hello> message was received. This includes <hello> messages with a 'session-id' attribute, bad namespace, and bad capability declarations."; } leaf in-sessions { type yang:zero-based-counter32; description "Number of sessions started. This counter is incremented when a <hello> message with a <session-id> is sent. 'in-sessions' - 'in-bad-hellos' = 'number of correctly started netconf sessions'"; } leaf dropped-sessions { type yang:zero-based-counter32; Scott & Bjorklund Standards Track [Page 23]
RFC 6022 YANG Module for NETCONF Monitoring October 2010 description "Number of sessions that were abnormally terminated, e.g., due to idle timeout or transport close. This counter is not incremented when a session is properly closed by a <close-session> operation, or killed by a <kill-session> operation."; } uses common-counters { description "Global counters, accumulated from all sessions. Zero based with following reset behaviour: - re-initialization of NETCONF server - when max value is reached"; } } } rpc get-schema { description "This operation is used to retrieve a schema from the NETCONF server. Positive Response: The NETCONF server returns the requested schema. Negative Response: If requested schema does not exist, the <error-tag> is 'invalid-value'. If more than one schema matches the requested parameters, the <error-tag> is 'operation-failed', and <error-app-tag> is 'data-not-unique'."; input { leaf identifier { type string; mandatory true; description "Identifier for the schema list entry."; } leaf version { type string; description "Version of the schema requested. If this parameter is not present, and more than one version of the schema exists on the server, a 'data-not-unique' error is returned, as described above."; } Scott & Bjorklund Standards Track [Page 24]
RFC 6022 YANG Module for NETCONF Monitoring October 2010 leaf format { type identityref { base schema-format; } description "The data modeling language of the schema. If this parameter is not present, and more than one formats of the schema exists on the server, a 'data-not-unique' error is returned, as described above."; } } output { anyxml data { description "Contains the schema content."; } } } } <CODE ENDS> 6. Security Considerations The YANG module defined in this memo is designed to be accessed via the NETCONF protocol [RFC4741]. The lowest NETCONF layer is the secure transport layer and the mandatory to implement secure transport is SSH [RFC4742]. 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 containers, list nodes, and data nodes with their specific sensitivity/vulnerability: /netconf-state/sessions/session/username: Contains identity information that could be used in an attempt to authenticate with the server. This username is only meant for monitoring, and SHOULD NOT be used for other purposes, such as access control, without a detailed discussion of the limitations of this reported username. For example, it is possible that server A and server B might report the same username, but these might be for different persons. Scott & Bjorklund Standards Track [Page 25]
RFC 6022 YANG Module for NETCONF Monitoring October 2010 7. Acknowledgements The authors would like to thank Andy Bierman, Mehmet Ersue, Washam Fan, David Harrington, Balazs Lengyel, Hideki Okita, Juergen Schoenwaelder, Bert Wijnen, and many other members of the NETCONF WG for providing important input to this document. The authors would also like to specifically acknowledge Sharon Chisholm's work on "NETCONF Monitoring Schema" [NETCONF] and contribution to this document. 8. IANA Considerations This document registers one URI in "The IETF XML Registry". Following the format in [RFC3688], the following has been registered. URI: urn:ietf:params:xml:ns:yang:ietf-netconf-monitoring Registrant Contact: The IESG. XML: N/A, the requested URI is an XML namespace. This document registers one module in the "YANG Module Names" registry. Following the format in [RFC6020], the following has been registered. name: ietf-netconf-monitoring namespace: urn:ietf:params:xml:ns:yang:ietf-netconf-monitoring prefix: ncm reference: RFC 6022 9. References 9.1. Normative References [ISO/IEC19757-2:2008] ISO/IEC, "Document Schema Definition Language (DSDL) -- Part 2: Regular-grammar-based validation -- RELAX NG", December 2008, <http://www.iso.org/iso/ catalogue_detail.htm?csnumber=37605>. [RFC2119] Bradner, S., "Key words for use in RFCs to Indicate Requirement Levels", BCP 14, RFC 2119, March 1997. [RFC4741] Enns, R., "NETCONF Configuration Protocol", RFC 4741, December 2006. Scott & Bjorklund Standards Track [Page 26]
RFC 6022 YANG Module for NETCONF Monitoring October 2010 [RFC4742] Wasserman, M. and T. Goddard, "Using the NETCONF Configuration Protocol over Secure SHell (SSH)", RFC 4742, December 2006. [RFC4743] Goddard, T., "Using NETCONF over the Simple Object Access Protocol (SOAP)", RFC 4743, December 2006. [RFC4744] Lear, E. and K. Crozier, "Using the NETCONF Protocol over the Blocks Extensible Exchange Protocol (BEEP)", RFC 4744, December 2006. [RFC5539] Badra, M., "NETCONF over Transport Layer Security (TLS)", RFC 5539, May 2009. [RFC5717] Lengyel, B. and M. Bjorklund, "Partial Lock Remote Procedure Call (RPC) for NETCONF", RFC 5717, December 2009. [RFC6020] Bjorklund, M., Ed., "YANG - A Data Modeling Language for the Network Configuration Protocol (NETCONF)", October 2010. [RFC6021] Schoenwaelder, J., Ed., "Common YANG Data Types", October 2010. [XML-NAMES] Hollander, D., Tobin, R., Thompson, H., Bray, T., and A. Layman, "Namespaces in XML 1.0 (Third Edition)", World Wide Web Consortium Recommendation REC-xml-names-20091208, December 2009, <http://www.w3.org/TR/2009/REC-xml-names-20091208>. [xmlschema-1] Biron, Paul V. and Ashok. Malhotra, "XML Schema Part 1: Structures Second Edition W3C Recommendation 28 October 2004", October 2004, <http://www.w3.org/TR/xmlschema-1>. 9.2. Informative References [NETCONF] Chisholm, S. and H. Trevino, "NETCONF Monitoring Schema", Work in Progress, February 2007. [RFC0959] Postel, J. and J. Reynolds, "File Transfer Protocol", STD 9, RFC 959, October 1985. [RFC2616] Fielding, R., Gettys, J., Mogul, J., Frystyk, H., Masinter, L., Leach, P., and T. Berners-Lee, "Hypertext Transfer Protocol -- HTTP/1.1", RFC 2616, June 1999. Scott & Bjorklund Standards Track [Page 27]
RFC 6022 YANG Module for NETCONF Monitoring October 2010 [RFC2818] Rescorla, E., "HTTP Over TLS", RFC 2818, May 2000. [RFC3688] Mealling, M., "The IETF XML Registry", BCP 81, RFC 3688, January 2004. Authors' Addresses Mark Scott Ericsson 3500 Carling Ave Nepean, Ontario K2H 8E9 Canada EMail: mark.scott@ericsson.com Martin Bjorklund Tail-f Systems Klara Norra Kyrkogata 31 SE-111 22 Stockholm, Sweden EMail: mbj@tail-f.com Scott & Bjorklund Standards Track [Page 28]
mirror server hosted at Truenetwork, Russian Federation.