Network Working Group M. Scott Internet-Draft Ericsson Intended status: Standards Track M. Bjorklund Expires: June 3, 2010 Tail-f Systems November 30, 2009 YANG Module for NETCONF Monitoring draft-ietf-netconf-monitoring-10 Status of this Memo This Internet-Draft is submitted to IETF in full conformance with the provisions of BCP 78 and BCP 79. 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. 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The list of Internet-Draft Shadow Directories can be accessed at http://www.ietf.org/shadow.html. This Internet-Draft will expire on June 3, 2010. Copyright Notice Copyright (c) 2009 IETF Trust and the persons identified as the document authors. All rights reserved. Scott & Bjorklund Expires June 3, 2010 [Page 1] Internet-Draft YANG Module for NETCONF Monitoring November 2009 This document is subject to BCP 78 and the IETF Trust's Legal Provisions Relating to IETF Documents in effect on the date of publication of this document (http://trustee.ietf.org/license-info). Please review these documents carefully, as they describe your rights and restrictions with respect to this document. Scott & Bjorklund Expires June 3, 2010 [Page 2] Internet-Draft YANG Module for NETCONF Monitoring November 2009 Abstract This document defines a 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 operation to retrieve them. Table of Contents 1. Introduction . . . . . . . . . . . . . . . . . . . . . . . . . 4 1.1. Definition of Terms . . . . . . . . . . . . . . . . . . . 4 2. Data Model to Monitor NETCONF . . . . . . . . . . . . . . . . 5 2.1. The /netconf-state Subtree . . . . . . . . . . . . . . . . 5 2.1.1. The /netconf-state/capabilities Subtree . . . . . . . 6 2.1.2. The /netconf-state/datastores Subtree . . . . . . . . 6 2.1.3. The /netconf-state/schemas Subtree . . . . . . . . . . 6 2.1.4. The /netconf-state/sessions Subtree . . . . . . . . . 7 2.1.5. The /netconf-state/statistics Subtree . . . . . . . . 8 3. Schema Specific Operations . . . . . . . . . . . . . . . . . . 10 3.1. The Operation . . . . . . . . . . . . . . . . 10 4. Examples . . . . . . . . . . . . . . . . . . . . . . . . . . . 11 4.1. Retrieving Schema List via Operation . . . . . . . . 11 4.2. Retrieving Schema Instances . . . . . . . . . . . . . . . 13 5. NETCONF Monitoring Schema . . . . . . . . . . . . . . . . . . 15 6. Security Considerations . . . . . . . . . . . . . . . . . . . 27 7. Acknowledgements . . . . . . . . . . . . . . . . . . . . . . . 28 8. IANA Considerations . . . . . . . . . . . . . . . . . . . . . 29 9. Appendix A - Change Log . . . . . . . . . . . . . . . . . . . 30 9.1. draft-ietf-netconf-monitoring-10 . . . . . . . . . . . . . 30 9.2. draft-ietf-netconf-monitoring-09 . . . . . . . . . . . . . 30 9.3. draft-ietf-netconf-monitoring-08 . . . . . . . . . . . . . 31 9.4. draft-ietf-netconf-monitoring-07 . . . . . . . . . . . . . 31 9.5. draft-ietf-netconf-monitoring-06 . . . . . . . . . . . . . 31 9.6. draft-ietf-netconf-monitoring-05 . . . . . . . . . . . . . 32 9.7. draft-ietf-netconf-monitoring-04 . . . . . . . . . . . . . 32 9.8. draft-ietf-netconf-monitoring-03 . . . . . . . . . . . . . 33 9.9. draft-ietf-netconf-monitoring-02 . . . . . . . . . . . . . 33 9.10. draft-ietf-netconf-monitoring-01 . . . . . . . . . . . . . 33 9.11. draft-scott-netconf-monitoring-00 . . . . . . . . . . . . 33 10. References . . . . . . . . . . . . . . . . . . . . . . . . . . 34 10.1. Normative References . . . . . . . . . . . . . . . . . . . 34 10.2. Informative References . . . . . . . . . . . . . . . . . . 35 Authors' Addresses . . . . . . . . . . . . . . . . . . . . . . . . 36 Scott & Bjorklund Expires June 3, 2010 [Page 3] Internet-Draft YANG Module for NETCONF Monitoring November 2009 1. Introduction This document defines a [YANG] model to be used to monitor the NETCONF protocol. It provides information about NETCONF sessions and supported schema. 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 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]. Schema: A machine readable data model definition. Scott & Bjorklund Expires June 3, 2010 [Page 4] Internet-Draft YANG Module for NETCONF Monitoring November 2009 2. Data Model to Monitor NETCONF The NETCONF monitoring data 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 MUST advertise the capability URI "urn:ietf:params:xml:ns:yang:ietf-netconf-monitoring". An overview of the specific monitoring data defined in this document which MUST be present follows. 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 subtree is the root of the monitoring data model. It acts as the container for the other monitored data. netconf-state /capabilities /datastores /schemas /sessions /statistics capabilities List of NETCONF capabilities supported by the server. datastores List of NETCONF datastores on the server. Includes all supported datastore types (running, candidate, startup) 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 (Container) Includes global counters for the NETCONF server. Scott & Bjorklund Expires June 3, 2010 [Page 5] Internet-Draft YANG Module for NETCONF Monitoring November 2009 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. configuration /name /locks name (container, netconf-datastore-type) Enumeration of supported datastores; candidate, running, startup. locks (grouping, lock-info) List of locks for the datastore. Information is provided for both global and partial locks. 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 Scott & Bjorklund Expires June 3, 2010 [Page 6] Internet-Draft YANG Module for NETCONF Monitoring November 2009 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 operation. identifier (string) Identifier for the schema list entry. Identifier is used in the 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. format (identifyref, schema-format) The data modeling language of the file/module. Current selection of xsd, yang, yin, rng and rnc. namespace(inet:uri) The XML namespace defined by the data model. location (union: enum, inet:uri) One of 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. sessions: session /session-id (key) /transport /username /source-host /login-time /in-rpcs Scott & Bjorklund Expires June 3, 2010 [Page 7] Internet-Draft YANG Module for NETCONF Monitoring November 2009 /in-bad-rpcs /out-rpc-errors /out-notifications session-id (session-id) Unique identifier for the session. This value is the NETCONF session identifier, as defined in [NETCONF Configuration Protocol]. transport (identityref, transport) Identifies transport for each session, e.g. "netconf-ssh", "netconf-soap", etc. username (string) If present, the username contains an identifier which can be used to uniquely identify an individual client (human or machine). source-host (inet:host) Host identifier (IP address or name) of the client. login-time (yang:date-and-time) Time at which the session was established. in-rpcs (yang:zero-based-counter32) Number of correct requests received. in-bad-rpcs (yang:zero-based-counter32) Number of messages received when a message was expected, that were not correct messages. This includes XML parse errors and errors on the rpc layer. out-rpc-errors (yang:zero-based-counter32) Number of messages sent which contained an element. out-notifications (yang:zero-based-counter32) Number of messages sent. 2.1.5. The /netconf-state/statistics Subtree Scott & Bjorklund Expires June 3, 2010 [Page 8] Internet-Draft YANG Module for NETCONF Monitoring November 2009 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 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 requests received. in-bad-rpcs (yang:zero-based-counter32) Number of messages received when a message was expected, that were not correct messages. out-rpc-errors (yang:zero-based-counter32) Number of messages sent which contained an element. out-notifications (yang:zero-based-counter32) Number of messages sent. Scott & Bjorklund Expires June 3, 2010 [Page 9] Internet-Draft YANG Module for NETCONF Monitoring November 2009 3. Schema Specific Operations 3.1. The 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 requested schema does not exist, the is 'invalid-value'. If requested schema is not unique, the is 'operation-failed', and is 'data-not-unique'. Scott & Bjorklund Expires June 3, 2010 [Page 10] Internet-Draft YANG Module for NETCONF Monitoring November 2009 4. Examples 4.1. Retrieving Schema List via Operation A NETCONF client retrieves the list of supported schema from a NETCONF server by retrieving the /netconf-state/schemas subtree via a operation. Available schema for the requesting session are returned in the reply containing the ,, , and elements. Since the same schema may be available in multiple locations and/or have multiple versions and/or multiple formats no particular attribute is unique. 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 URL details returned in the list SHOULD facilitate retrieval from a network location via a means such as ftp or http. Additionally the ability to retrieve a schema via NETCONF SHOULD be supported. When a schema is available on the device and the operation is supported by the NETCONF server a location value of 'NETCONF' MUST be used to indicate that it can be retrieved via NETCONF using the operation described in section 3.1. Example: The NETCONF server returns a list of data models available for retrieval. Scott & Bjorklund Expires June 3, 2010 [Page 11] Internet-Draft YANG Module for NETCONF Monitoring November 2009 foo 1.0 xsd http://example.com/foo ftp://ftp.example.com/schemas/foo_1.0.xsd http://www.example.com/schema/foo_1.0.xsd NETCONF foo 1.1 xsd http://example.com/foo ftp://ftp.example.com/schemas/foo_1.1.xsd http://www.example.com/schema/foo_1.1.xsd NETCONF bar 2008-06-01 yang http://example.com/bar http://example.com/schema/bar-2008-06-01.yang NETCONF bar-types 2008-06-01 yang http://example.com/bar http://example.com/schema/bar-types-2008-06-01.yang NETCONF Scott & Bjorklund Expires June 3, 2010 [Page 12] Internet-Draft YANG Module for NETCONF Monitoring November 2009 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 using identifier, version, and format parameters. foo 1.0 xsd 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 using identifer and version parameters: Scott & Bjorklund Expires June 3, 2010 [Page 13] Internet-Draft YANG Module for NETCONF Monitoring November 2009 bar 2008-06-01 module bar { //default format (yang) returned //bar version 2008-06-01 yang module //contents here ... } 3. bar-types, version 2008-06-01 in default YANG format: a. Via using identifer parameter: bar-types module bar-types { //default format (yang) returned //latest revision returned //bar-types version 2008-06-01 yang module //contents here ... } Scott & Bjorklund Expires June 3, 2010 [Page 14] Internet-Draft YANG Module for NETCONF Monitoring November 2009 5. NETCONF Monitoring Schema The data model described in this memo is defined in the following YANG module. module ietf-netconf-monitoring { namespace "urn:ietf:params:xml:ns:yang:ietf-netconf-monitoring:DRAFT-10"; prefix "ns"; import ietf-yang-types { prefix yang; } import ietf-inet-types { prefix inet; } organization "IETF NETCONF (Network Configuration) Working Group"; contact "WG Web: WG List: WG Chair: Mehmet Ersue WG Chair: Bert Wijnen Editor: Mark Scott "; description "NETCONF Monitoring Module. All elements in this module are read-only. Copyright (c) 2009 IETF Trust and the persons identified as the document authors. All rights reserved. Redistribution and use in source and binary forms, with or without modification, is permitted pursuant to, and subject to the license terms contained in, the Simplified BSD License set forth in Section 4.c of the IETF Trust's Legal Provisions Relating to IETF Documents (http://trustee.ietf.org/license-info). Scott & Bjorklund Expires June 3, 2010 [Page 15] Internet-Draft YANG Module for NETCONF Monitoring November 2009 This version of this YANG module is part of RFC XXXX; see the RFC itself for full legal notices."; // RFC Ed.: replace XXXX with actual RFC number and remove this note revision 2009-11-20 { description "Initial revision."; reference "RFC XXXX: NETCONF Monitoring Schema"; // RFC Ed.: replace XXXX with actual RFC number and remove this note } // 'session-id-type' from 'ietf-netconf' module // can be replaced with import when 4741bis is published typedef session-id { type uint32 { range "1..max"; } description "NETCONF Session Id."; reference "RFC 4741: NETCONF Configuration Protocol"; } // to be added to base protocol 'ietf-netconf' module // and imported when 4741bis is published grouping netconf-datastore-type { description "Enumeration of possible NETCONF datastore types."; reference "RFC 4741: NETCONF Configuration Protocol"; choice datastore { mandatory true; leaf running { type empty; } leaf candidate { type empty; } leaf startup { type empty; } } } identity transport { description "Base identity for NETCONF transport types."; Scott & Bjorklund Expires June 3, 2010 [Page 16] Internet-Draft YANG Module for NETCONF Monitoring November 2009 } identity netconf-ssh { base transport; reference "RFC 4742: Using the NETCONF Configuration Protocol over Secure SHell (SSH)"; } identity netconf-soap-over-beep { base transport; reference "RFC 4743: Using NETCONF over the Simple Object Access Protocol (SOAP)"; } identity netconf-soap-over-https { base transport; reference "RFC 4743: Using NETCONF over the Simple Object Access Protocol (SOAP)"; } identity netconf-beep { base transport; reference "RFC 4744: Using the NETCONF Protocol over the Blocks Extensible Exchange Protocol (BEEP)"; } identity netconf-tls { base transport; 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; reference "W3C REC REC-xmlschema-1-20041028: XML Schema Part 1: Structure W3C REC REC-xmlschema-2-20041028: XML Schema Part 2: Datatypes"; } Scott & Bjorklund Expires June 3, 2010 [Page 17] Internet-Draft YANG Module for NETCONF Monitoring November 2009 identity rng { base schema-format; reference "ISO/IEC 19757-2: RELAX NG"; } identity yang { base schema-format; reference "RFC XXXX: YANG - A data modeling language for NETCONF"; // RFC Ed.: replace XXXX with actual RFC number and remove this note } identity yin { base schema-format; reference "RFC XXXX: YANG - A data modeling language for NETCONF"; // RFC Ed.: replace XXXX with actual RFC number and remove this note } identity rnc { base schema-format; reference "ISO/IEC 19757-2: 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 messages received."; } leaf in-bad-rpcs { type yang:zero-based-counter32; description "Number of messages received when a message was expected, that were not correct messages. This includes XML parse errors and errors on the rpc layer."; } leaf out-rpc-errors { type yang:zero-based-counter32; description "Number of messages sent which contained an element."; Scott & Bjorklund Expires June 3, 2010 [Page 18] Internet-Draft YANG Module for NETCONF Monitoring November 2009 } leaf out-notifications { type yang:zero-based-counter32; description "Number of messages sent."; } } container netconf-state { config false; description "The /netconf-state subtree is the root of the monitoring data model. It acts as the container for the other monitored data."; container capabilities { description "The list of currently provided NETCONF capabilities exchanged during session setup (i.e. hello)."; leaf-list capability { type inet:uri; } } container datastores { description "List of NETCONF configuration datastores (e.g. running, startup, candidate) supported on this device and related information."; list datastore { container name { uses netconf-datastore-type; } container locks { description "The NETCONF and 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 which acquired the lock(s). Monitoring information is provided for each datastore entry including details such as the session which acquired the lock, the type of lock (global or partial) and the list of locked resources. Multiple locks per datastore are supported."; Scott & Bjorklund Expires June 3, 2010 [Page 19] Internet-Draft YANG Module for NETCONF Monitoring November 2009 grouping lock-info { leaf locked-by-session { type session-id; 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."; } leaf locked-time { type yang:date-and-time; description "The date and time of when the resource was locked."; } } choice lock-type { container global-lock { description "Present if the global lock is set."; uses lock-info; } list partial-locks { key lock-id; description "List of partial locks."; leaf lock-id { type uint32; description "For a partial lock this is the lock id returned in the response."; } uses lock-info; leaf-list select { type string; min-elements 1; description "The xpath expression which was used to request the lock. The select expression indicates the original intended scope of the lock."; } leaf-list locked-nodes { type instance-identifier; description "The list of instance-identifiers (i.e. the Scott & Bjorklund Expires June 3, 2010 [Page 20] Internet-Draft YANG Module for NETCONF Monitoring November 2009 locked nodes). The scope of the partial lock is defined by the list of locked nodes. This list can change over time."; } } } } } } container schemas { list schema { key "identifier version format"; leaf identifier { type string; description "Identifier to uniquely reference the schema. Identifier is used in the operation and may be used for other purposes such as file retrieval. For modeling languages which support or require a data model name (eg: 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 of the file/module. Scott & Bjorklund Expires June 3, 2010 [Page 21] Internet-Draft YANG Module for NETCONF Monitoring November 2009 Current selection of xsd, yang, yin, rng and rnc. For YANG data models, 'yang' format MUST be supported and 'yin' format MAY also be provided."; } leaf namespace { type inet:uri; 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 (eg: reference to file system for ftp retrieval) or retrieved directly from a server supporting the operation (denoted by the value 'NETCONF')."; } } } container sessions { description "Includes session specific data for NETCONF management sessions. The session list MUST include all currently active NETCONF sessions."; list session { key session-id; description "Unique identifier for the session. If the session is a NETCONF session, this value is the NETCONF session identifier. Scott & Bjorklund Expires June 3, 2010 [Page 22] Internet-Draft YANG Module for NETCONF Monitoring November 2009 For purposes of NETCONF management all sessions are one of: Known session: any session which can be managed by the NETCONF server SHOULD be reported in this table. Unknown session: such sessions are not managed by the NETCONF server and map to NETCONF session identifier 0. These MUST be excluded from the list as a result."; leaf session-id { type session-id; } 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; description "If present, the username contains an identifier which can be used to uniquely identify an individual client (human or machine). This is likely to be implementation specific and subject to the security requirements of the device vendor and/or operators, e.g., an SSH user, a host RSA fingerprint or other identifier deemed acceptable."; } leaf source-host { type inet:host; description "Host identifier (IP address or name) of the client."; } leaf login-time { type yang:date-and-time; mandatory true; description "Time 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"; Scott & Bjorklund Expires June 3, 2010 [Page 23] Internet-Draft YANG Module for NETCONF Monitoring November 2009 } } } container statistics { 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 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 message with a is sent. 'in-sessions' - 'in-bad-hellos' = 'number of correctly started netconf sessions'"; } leaf dropped-sessions { type yang:zero-based-counter32; 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 operation, or killed by a 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"; } } } Scott & Bjorklund Expires June 3, 2010 [Page 24] Internet-Draft YANG Module for NETCONF Monitoring November 2009 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 is 'invalid-value'. If more than one schema matches the requested parameters, the is 'operation-failed', and 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."; } 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."; } } Scott & Bjorklund Expires June 3, 2010 [Page 25] Internet-Draft YANG Module for NETCONF Monitoring November 2009 } } Scott & Bjorklund Expires June 3, 2010 [Page 26] Internet-Draft YANG Module for NETCONF Monitoring November 2009 6. Security Considerations The NETCONF monitoring schema as defined in this document provides information about a NETCONF system that could be used to aid an attack on that system. The same considerations as for the base [RFC4741] are valid. It is assumed that access to the data and operations defined in this document are subject to appropriate access control on the device. Scott & Bjorklund Expires June 3, 2010 [Page 27] Internet-Draft YANG Module for NETCONF Monitoring November 2009 7. Acknowledgements The authors would like to thank Andy Bierman, Sharon Chisholm, 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. Scott & Bjorklund Expires June 3, 2010 [Page 28] Internet-Draft YANG Module for NETCONF Monitoring November 2009 8. IANA Considerations -- Editor note to IANA/RFC-Editor: we request that you make these assignments, in which case it is to be documented as below replacing 'rfcXXXX' as appropriate This document registers one URI in the IETF XML registry. Following the format in [The IETF XML Registry], the following registration is requested. 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 YANG module in the YANG Module Names registry [RFC XXXX]. name: ietf-netconf-monitoring namespace: urn:ietf:params:xml:ns:yang:ietf-netconf-monitoring:rfcXXXX prefix: ns reference: rfcXXXX Scott & Bjorklund Expires June 3, 2010 [Page 29] Internet-Draft YANG Module for NETCONF Monitoring November 2009 9. Appendix A - Change Log [-- Editor note to IANA/RFC-Editor: Please remove this section upon publication.] 9.1. draft-ietf-netconf-monitoring-10 - sec 1.1, updated schema definition, removed YANG definition (it is in references instead) - reworded text in Intro about NETCONF clients adjusting 'capabilities', per agreement that capacbilities can not change in a session (per 4741bis) - introduction, removed description of NETCONF behaviour for schema changes on active sesssions. Has been moved to 4741bis - updated namespace from '*:ns:netconf::state' to '*:yang:ns:ietf-netconf-monitoring:DRAFT-10' For details see ML archive: 'http://www.ietf.org/mail-archive/web/netconf/current/msg05296.html' - moved majority of sec 2 into the yang module (making module self describing), leaving only overview text in the RFC body. For details see ML archive: 'http://www.ietf.org/mail-archive/web/netconf/current/msg05209.html' - reworded definition of 'schema' - removed residual references to XSD types (i.e. xs:string) - reworded text that schema may not always be retrievable - will add additional text that yang format is both the default and mandatory; yin is optional - updated text per Juergen's WGLC comments on v09. For details see ML arhive: 'http://www.ietf.org/mail-archive/web/netconf/current/msg05306.html' - updated reference in sec 1.1 for RFC2119 - title change to 'YANG Module for NETCONF Monitoring' 9.2. draft-ietf-netconf-monitoring-09 Scott & Bjorklund Expires June 3, 2010 [Page 30] Internet-Draft YANG Module for NETCONF Monitoring November 2009 - reversion of 'session-type' to 'transport' - element naming consistency. All lowerCamelCase names have been converted to 'hyphen-delimited' or 'netconf-style-naming' as it is sometimes referred to on the ML. E.g. 'sessionType' -> 'session-type'. This change impacts both the draft text and yang module. - <get-schema> operation updated: - now has only one mandatory parameter, 'identifier' - updated negative responses, including the rpc operation description in yang module - comments added to the yang module indicating that the definition of 'session-id' is consistent with 4741bis 'session-id-type' and could be imported from that pending RFC. Similar for 'netconf-datastore-type'. This was in favour of adding further dependencies and delays by waiting for 4741bis to complete. 9.3. draft-ietf-netconf-monitoring-08 - Addresses action items from IETF75 and mailing list comments - Most significant is the decision to adopt YANG as normative As a result the publication of this draft depends on: o WGLC updates (if required) o updates to the normative model as result of netmod YANG changes (if required) o data organization changes if WG adopts a new data hierarchy for netmod (this draft uses "/netconf-state/") - XML Schema of model and IP host definition have been removed 9.4. draft-ietf-netconf-monitoring-07 - updates the examples in sec 4.2 per ML discussion 9.5. draft-ietf-netconf-monitoring-06 Scott & Bjorklund Expires June 3, 2010 [Page 31] Internet-Draft YANG Module for NETCONF Monitoring November 2009 - replaced references to 'schema-retrieval capability' with '<get-schema> operation' - upper/lowercase alignment on references to 'format' - changed negative response for <get-schema> to 'data-missing' - ML comments on v05 which required changes in the draft: o 2.1.2: reworded to avoid suggestion that configurable data was contained in the sub-tree (per Balazs' request) o 2.1.2: reworded paragraph partial lock and select statements (per Balazs' suggested text) o Fixed examples in 3.1 and added negative response (per Balazs' comment) o YANG: location changed to leaf-list (per Balazs' comment) o added non-normative references to yang and yang-types (per Balazs' comment) o 2.1.3: added YIN and RNC to format 'enums' text and models 9.6. draft-ietf-netconf-monitoring-05 This version addresses action items from IETF74 and comments on v4. - updated statistics (and counter definitions) per offline discussion: - updated counter definitions - updated data types (addition of ZeroBasedCounter32) - per session counters; see section 2.1.4 - global counters; see section 2.1.5 - unique sessionId handling and WG consensus: o expected handling of NETCONF and non-NETCONF sessions defined o explicit exclusion of sessionId=0 added o see section 2.1.4 - removal of subscriptions subtree; was sec 2.1.5 in v4 - revised XSD and YANG models 9.7. draft-ietf-netconf-monitoring-04 - New RPC operation defined <get-schema<, replacing <list-schema>. - Updated Abstract and Introduction: new text, removed NETCONF protocol diagram. - Changed /netconfstate/ to /netconf-state - Added netconf-state/datastores - Changed /netconf-state/schema to /netconf-state/schemas - Added /netconf-state/statistics - Added /schema/format (and added to key) - Added /schema/namespace (and added to key) Scott & Bjorklund Expires June 3, 2010 [Page 32] Internet-Draft YANG Module for NETCONF Monitoring November 2009 - Updated examples. - More detailed monitored data descriptions per ML comments. 9.8. draft-ietf-netconf-monitoring-03 - incorporates ML list comments on v-02. 9.9. draft-ietf-netconf-monitoring-02 - Merged content from 'draft-scott-netconf-schema-query' into this draft - this draft now covers both schema retrievel and monitoring 9.10. draft-ietf-netconf-monitoring-01 - WG first draft, 'draft-ietf-netconf-monitoring-01'. - Related draft 'draft-scott-netconf-schema-query-00' also presented covering schema retrieval. Query draft proposes new NETCONF operations to retrieve schema defined in this draft. 9.11. draft-scott-netconf-monitoring-00 - Initial draft, 'draft-scott-monitoring-00' - based on 'draft-netconf-chisholm-monitoring-02' - adopted as working group document at IETF69. Scott & Bjorklund Expires June 3, 2010 [Page 33] Internet-Draft YANG Module for NETCONF Monitoring November 2009 10. References 10.1. Normative References [ISO/IEC 19757-2:2008] ISO/IEC, "Document Schema Definition Language (DSDL) -- Part 2: Regular-grammar-based validation -- RELAX NG", December 2008, . [Partial Lock RPC for NETCONF] Lengyel, Balazs., "Partial Lock RPC for NETCONF", February 2009, . [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, February 2006, . [RFC4742] Wasserman, M. and T. Goddard, "Using the NETCONF Configuration Protocol over Secure SHell (SSH)", December 2006, . [RFC4743] Goddard, T., "Using NETCONF over the Simple Object Access Protocol (SOAP)", December 2006, . [RFC4744] Lear, E. and K. Crozier, "Using the NETCONF Protocol over the Blocks Extensible Exchange Protocol (BEEP)", December 2008, . [RFC5277] Chisholm, S. and H. Trevino, "NETCONF Event Notifications", ID draft-ietf-netconf-notification-14, July 2008, . [RFC5539] Badra, M., "NETCONF over Transport Layer Security (TLS)", May 2009, . [The IETF XML Registry] Bradner, s., ""Key words for use in RFCs to Indicate Requirement Levels", BCP 14", RFC 2119, March 1997, . [XML] World Wide Web Consortium, "Extensible Markup Language (XML) 1.0", W3C XML, February 1998, Scott & Bjorklund Expires June 3, 2010 [Page 34] Internet-Draft YANG Module for NETCONF Monitoring November 2009 . [xmlschema-2] Biron, Paul V. and Ashok. Malhotra, "XML Schema Part 2: Datatypes Second Edition W3C Recommendation 28 October 2004", RFC 2119, October 2004, . 10.2. Informative References [Common YANG Data Types] Schoenwaelder, J., "Common YANG Data Types", June 2009, . [YANG] Bjorklund, M., "YANG - A data modeling language for NETCONF", June 2009, . Scott & Bjorklund Expires June 3, 2010 [Page 35] Internet-Draft YANG Module for NETCONF Monitoring November 2009 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 Expires June 3, 2010 [Page 36]