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IETF RFC 6022
YANG Module for NETCONF Monitoring
Last modified on Wednesday, October 6th, 2010
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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/RFC 6022.
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 [RFC 6020] model to be used to monitor
the NETCONF protocol. It provides information about NETCONF sessions
and supported schema as defined in [RFC 4741].
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 [RFC 2119].
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 [RFC 6020].
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.
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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.
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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 [RFC 5717]. 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.
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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 [RFC 4741].
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.
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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.
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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'.
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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 [RFC 959] or http(s) [RFC 2616] [RFC 2818], 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.
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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>
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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:
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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>
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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 [RFC 6021] and references
[RFC 4741], [RFC 4742], [RFC 4743], [RFC 4744], [RFC 5539], [xmlschema-1],
[RFC 6020], [ISO/IEC19757-2:2008], and [RFC 5717].
<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";
}
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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;
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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;
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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.";
}
}
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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.";
}
}
}
}
}
}
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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).
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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').";
}
}
}
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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)";
}
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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.";
}
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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 [RFC 4741]. The lowest NETCONF layer is the
secure transport layer and the mandatory to implement secure
transport is SSH [RFC 4742].
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.
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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 [RFC 3688], 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 [RFC 6020], 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>.
[RFC 2119] Bradner, S., "Key words for use in RFCs to Indicate
Requirement Levels", BCP 14, RFC 2119, March 1997.
[RFC 4741] Enns, R., "NETCONF Configuration Protocol", RFC 4741,
December 2006.
Scott & Bjorklund Standards Track PAGE 26
RFC 6022 YANG Module for NETCONF Monitoring October 2010
[RFC 4742] Wasserman, M. and T. Goddard, "Using the NETCONF
Configuration Protocol over Secure SHell (SSH)", RFC 4742,
December 2006.
[RFC 4743] Goddard, T., "Using NETCONF over the Simple Object Access
Protocol (SOAP)", RFC 4743, December 2006.
[RFC 4744] Lear, E. and K. Crozier, "Using the NETCONF Protocol over
the Blocks Extensible Exchange Protocol (BEEP)", RFC 4744,
December 2006.
[RFC 5539] Badra, M., "NETCONF over Transport Layer Security (TLS)",
RFC 5539, May 2009.
[RFC 5717] Lengyel, B. and M. Bjorklund, "Partial Lock Remote
Procedure Call (RPC) for NETCONF", RFC 5717,
December 2009.
[RFC 6020] Bjorklund, M., Ed., "YANG - A Data Modeling Language for
the Network Configuration Protocol (NETCONF)",
October 2010.
[RFC 6021] 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.
[RFC 959] Postel, J. and J. Reynolds, "File Transfer Protocol",
STD 9, RFC 959, October 1985.
[RFC 2616] 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
[RFC 2818] Rescorla, E., "HTTP Over TLS", RFC 2818, May 2000.
[RFC 3688] 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
YANG Module for NETCONF Monitoring
RFC TOTAL SIZE: 46988 bytes
PUBLICATION DATE: Wednesday, October 6th, 2010
LEGAL RIGHTS: The IETF Trust (see BCP 78)
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