Self Explanation Data Object Tags
draft-tao-netmod-yang-node-tags-05
The information below is for an old version of the document.
| Document | Type |
This is an older version of an Internet-Draft whose latest revision state is "Replaced".
|
|
|---|---|---|---|
| Authors | Qin Wu , Benoît Claise , Liang Geng , Zongpeng Du | ||
| Last updated | 2020-08-16 (Latest revision 2020-08-10) | ||
| Replaced by | draft-ietf-netmod-node-tags, draft-ietf-netmod-node-tags, draft-ietf-netmod-node-tags, draft-ietf-netmod-node-tags, draft-ietf-netmod-node-tags | ||
| RFC stream | Internet Engineering Task Force (IETF) | ||
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| Additional resources | Mailing list discussion | ||
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draft-tao-netmod-yang-node-tags-05
NETMOD Working Group Q. Wu
Internet-Draft Huawei
Intended status: Standards Track B. Claise
Expires: February 17, 2021 Cisco
L. Geng
Z. Du
China Mobile
August 16, 2020
Self Explanation Data Object Tags
draft-tao-netmod-yang-node-tags-05
Abstract
This document defines a method to tag data objects associated with
operation and management data in YANG Modules. This YANG data object
tagging method can be used to identify characteristics data and
correlate data objects from different data sources and provide input,
instruction, indication to selection filter and filter queries of
operational state on a server during a "pub/sub" service for YANG
datastore updates. When the state of all subscriptions of a
particular Subscriber to be fetched is huge, the amount of data to be
streamed out to the destination can be greatly reduced and only
targeted to the characteristics data.
An extension statement to be used to indicate self explanation YANG
data object tags that SHOULD be added by the module implementation
automatically (i.e., outside of configuration).
A YANG module [RFC7950] is defined, which augments Module tag model
and provides a list of data object entries to allow for adding or
removing of self explanation data object tags as well as viewing the
set of self explanation tags associated with the data object within
the YANG module.
Status of This Memo
This Internet-Draft is submitted in full conformance with the
provisions of BCP 78 and BCP 79.
Internet-Drafts are working documents of the Internet Engineering
Task Force (IETF). Note that other groups may also distribute
working documents as Internet-Drafts. The list of current Internet-
Drafts is at https://datatracker.ietf.org/drafts/current/.
Internet-Drafts are draft documents valid for a maximum of six months
and may be updated, replaced, or obsoleted by other documents at any
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time. It is inappropriate to use Internet-Drafts as reference
material or to cite them other than as "work in progress."
This Internet-Draft will expire on February 17, 2021.
Copyright Notice
Copyright (c) 2020 IETF Trust and the persons identified as the
document authors. All rights reserved.
This document is subject to BCP 78 and the IETF Trust's Legal
Provisions Relating to IETF Documents
(https://trustee.ietf.org/license-info) in effect on the date of
publication of this document. Please review these documents
carefully, as they describe your rights and restrictions with respect
to this document. Code Components extracted from this document must
include Simplified BSD License text as described in Section 4.e of
the Trust Legal Provisions and are provided without warranty as
described in the Simplified BSD License.
Table of Contents
1. Introduction . . . . . . . . . . . . . . . . . . . . . . . . 3
1.1. Self Explanation Data Object Tags Use Cases . . . . . . . 4
1.1.1. Network Performance Data Collection . . . . . . . . . 4
1.1.2. Context Information Tagging . . . . . . . . . . . . . 7
1.2. Terminology . . . . . . . . . . . . . . . . . . . . . . . 8
2. Data Object Tag Values . . . . . . . . . . . . . . . . . . . 8
2.1. IETF Tags Prefix . . . . . . . . . . . . . . . . . . . . 8
2.2. Vendor Tags Prefix . . . . . . . . . . . . . . . . . . . 9
2.3. User Tags Prefix . . . . . . . . . . . . . . . . . . . . 9
2.4. Reserved Tags Prefix . . . . . . . . . . . . . . . . . . 9
3. Data Object Tag Management . . . . . . . . . . . . . . . . . 9
3.1. Module Design Tagging . . . . . . . . . . . . . . . . . . 9
3.2. Implementation Tagging . . . . . . . . . . . . . . . . . 10
3.3. User Tagging . . . . . . . . . . . . . . . . . . . . . . 11
4. Tags Module Structure . . . . . . . . . . . . . . . . . . . . 11
4.1. Tags Module Tree . . . . . . . . . . . . . . . . . . . . 11
5. YANG Module . . . . . . . . . . . . . . . . . . . . . . . . . 11
6. Guidelines to Model Writers . . . . . . . . . . . . . . . . . 19
6.1. Define Standard Tags . . . . . . . . . . . . . . . . . . 19
7. IANA Considerations . . . . . . . . . . . . . . . . . . . . . 20
7.1. YANG Data Object Tag Prefixes Registry . . . . . . . . . 20
7.2. IETF YANG Data Object Tags Registry . . . . . . . . . . . 20
7.3. Updates to the IETF XML Registry . . . . . . . . . . . . 25
7.4. Updates to the YANG Module Names Registry . . . . . . . . 26
8. Security Considerations . . . . . . . . . . . . . . . . . . . 26
9. Contributors . . . . . . . . . . . . . . . . . . . . . . . . 26
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10. References . . . . . . . . . . . . . . . . . . . . . . . . . 27
10.1. Normative References . . . . . . . . . . . . . . . . . . 27
10.2. Informative References . . . . . . . . . . . . . . . . . 27
Appendix A. NETCONF Example . . . . . . . . . . . . . . . . . . 28
Appendix B. Non-NMDA State Module . . . . . . . . . . . . . . . 29
Appendix C. Targeted data object subscription example . . . . . 37
Authors' Addresses . . . . . . . . . . . . . . . . . . . . . . . 40
1. Introduction
As described [I.D-ietf-netmod-module-tags], the use of tags for
classification and organization is fairly ubiquitous not only within
IETF protocols, but in the internet itself (e.g., "#hashtags"). A
module tag defined in [I.D-ietf-netmod-module-tags] is a string
associated only with a module name at module level.
At the time of writing this document (2020), there are many data
models that have been specified or are being specified by various
different SDOs and Open Souce community. They cover many of the
networking protocols and techniques. However data objects defined by
these technology specific data models might represent a portion of
fault, configuration, accounting, performance, security management
categories information (e.g., performance metric specific data object
type) at different locations in various different ways, lack
consistent classification criteria and representation
granularity,e.g., sensor data in hardware model is defined with fine
granularity with value scale and value precision while interface
model only provides statistics data for specific interface type.
This document defines self explanation data object tags and
associates them with data objects within YANG module, which
o Provide dictionary meaning for specific targeted data objects;
o Indicate relationship between data objects within the same YANG
module or from different YANG modules;
o Identify key performance metric scale, precision, statistics
operation type;
o Identify specific service or feature, data source.
The self explanation data object tags can be used by the client to
identify characteristics data and correlate data objects from
different data sources and provide input, instruction, indication to
selection filter and filter queries of configuration or operational
state on a server based on these data object tags,.e.g.,return
specific object type of operational state related to system-
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management. NETCONF clients can discover data objects with self
explanation data object tags supported by a NETCONF server via <get-
schema> operation. The self explanation data object tag capability
can also be advertised via capability notification Model [I-
D.netconf-notification-capabilities] by the NETCONF server or some
place where offline document are kept. These self explanation tags
may be registered as well as assigned during the module definition;
assigned by implementations; or dynamically defined and set by users.
This document defines a YANG module [RFC7950] which augments module
tag model and provides a list of data object entries to allow for
adding or removing of self explanation tags as well as viewing the
set of self explanation tags associated with a data object within
YANG modules.
This document defines an extension statement to be used to indicate
self explanation tags that SHOULD be added by the module
implementation automatically (i.e., outside of configuration).
The YANG data model in this document conforms to the Network
Management Datastore Architecture defined in [RFC8342].
1.1. Self Explanation Data Object Tags Use Cases
The following is a list of already implemented and potential use
cases.
1.1.1. Network Performance Data Collection
Among Data object tags, the performance metric tags can be used to
capture the performance metrics and properties associated with YANG
data nodes or data objects modelled with YANG (See Figure 1).
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----- -----
// \\ // \\
| Property+------+ +-------+ Property|
\\ A // | | \\ B //
-----+ +--V----------------V---+ -----
| YANG Data Node |
| /Data Object A |
/---\ +--^----------------^---+ /---\
/ \ | | / \
|Metric +-------+ +--------|Metric |
\ A / \ B /
\-+-/ \-+-/
+-------------+ |
| |--------------
| Metric Group|
/----\ | |-------------+
/ \ +-------------+ |
|Property| |
\ D / |
\--+-/ /----\
| +----------------------+ / \
| | YANG Data Node <-------| Metric |
+---| /Data Object B | \ C /
+----------------------+ \----/
Figure 1
The use of performance metric tags would be to help filter discrete
categories of YANG data objects across different YANG modules
supported by a device and capture network performance data. If data
objects across YANG modules are suitably tagged and learnt by the
client from a live server, the client can extract paths to all
interested data objects and then use an XPath query to list all
related data objects which reflect network characteristics(see
Figure 2).
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+-----------+---------------+-----------+-----------------------+
| Object | Property | Metric | Metric Module |
| Name | Name | Group | Name |
| | | | |
|tunnel-svc | name | - | - tunnel |
| | | | |
|tunnel-svc | create-time | - | - tunnel |
| | | | |
|tunnel-svc | modified-time | - | - |
| | | | |
|tunnel-svc | - |lsp-ping-pm| avg-latency tunnel-pm|
| | | | |
|tunnel-svc | - |lsp-ping-pm| packet-loss tunnel-pm|
| | | | |
|tunnel-svc | - |lsp-ping-pm| min-latency tunnel-pm|
| | | | |
|tunnel-svc | - |lsp-ping-pm| max-latency tunnel-pm|
| | | |transmitted |
|tunnel-svc | - |lsp-ping-pm| -packet tunnel-pm|
+-----------+---------------+-----------+-----------------------+
+---------------------------------------------------------+
| Metric Metric Metric Metric Operation |
| Group Name Precision Scale Type |
| |
| lsp-ping-pm avg- 1 1 avg |
| latency |
| |
| lsp-ping-pm packet- 1 1 avg |
| loss |
| |
| |
| lsp-ping-pm min- 1 1 min |
| latency |
| |
| |
| lsp-ping-pm max- 1 1 max |
| latency |
| |
| |
| lsp-ping-pm transmitted 1 1 normal |
| -packet |
+---------------------------------------------------------+
Figure 2
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1.1.2. Context Information Tagging
Performance metric tags can also be used to help correlate data
objects with the same characteristics when clients are interacting
with various different devices with the different categories of YANG
data node across different YANG modules. For example, one management
client could mark some specific data node across modules implemented
in various different devices with the same metric group tag as
context information, so consistent representation and reporting can
be provided for YANG data nodes belonging to the same metric group
(see Figure 2).
Another example is the management client could mark some data node
across different level of YANG modules implemented in the device, the
management system separately with the same service tag (e.g., L3VPN
Service) as context information, so root cause can be identified
efficiently during network failure troubleshooting (See Figure 3)
+--------------+
| Parent object|
+-------^------+
|
----- +-----+-----+ -----
// \\ |Service Tag| // \\
| Property+------+ ++--------+-+ +-------+ Property|
\\ A // | | | | \\ B //
-----+ +--V---V-+ +-V---V--+ -----
| Child | | Child |
|ObjectA | |ObjectB |
/---\ +--^-----+ +-----^--+ /---\
/ \ | | / \
|Metric +-------+ +--------|Metric |
\ A / \ B /
\---/ \---/
Figure 3
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+-----------------------------------------------------------+
| Service Metric Metric Module Level |
| Tag Group Name |
| |
| L3VPN L3VPN maximum L3VPN Service |
| -routes |
| |
| L3VPN OSPF-Process total-active OSPF Device |
| routes |
| |
| total-active |
| L3VPN RIP-Process routes RIP Device |
| |
| total-active |
| L3VPN BGP-Process routes BGP Device |
| |
+-----------------------------------------------------------+
Figure 4
1.2. Terminology
The key words "MUST", "MUST NOT", "REQUIRED", "SHALL", "SHALL NOT",
"SHOULD", "SHOULD NOT", "RECOMMENDED", "NOT RECOMMENDED", "MAY", and
"OPTIONAL" in this document are to be interpreted as described in BCP
14 [RFC2119] [RFC8174] when, and only when, they appear in all
capitals, as shown here.
2. Data Object Tag Values
All data object tags SHOULD begin with a prefix indicating who owns
their definition. An IANA registry (Section 7.1) is used to support
registering data object tag prefixes. Currently 3 prefixes are
defined.
No further structure is imposed by this document on the value
following the registered prefix, and the value can contain any YANG
type 'string' characters except carriage-returns, newlines and tabs.
Therefore, designers, implementers, and users are free to add or not
add any structure they may require to their own tag values.
2.1. IETF Tags Prefix
An IETF tag is a data object tag that has the prefix "ietf:". All
IETF data object tags are registered with IANA in a registry defined
later in this document (Section 7.2).
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2.2. Vendor Tags Prefix
A vendor tag is a tag that has the prefix "vendor:". These tags are
defined by the vendor that implements the module, and are not
registered; however, it is RECOMMENDED that the vendor include extra
identification in the tag to avoid collisions such as using the
enterprise or organization name following the "vendor:" prefix (e.g.,
vendor:vendor-defined-classifier).
2.3. User Tags Prefix
A user tag is any tag that has the prefix "user:". These tags are
defined by the user/administrator and are not meant to be registered.
Users are not required to use the "user:" prefix; however, doing so
is RECOMMENDED as it helps avoid prefix collisions.
2.4. Reserved Tags Prefix
Any tag not starting with the prefix "ietf:", "vendor:" or "user:" is
reserved for future use. These tag values are not invalid, but
simply reserved in the context of specifications (e.g., RFCs).
3. Data Object Tag Management
Tags can become associated with a data object within YANG module in a
number of ways. Tags may be defined and associated at the module
design time, at implementation time without the need of live server,
or via user administrative control . As the main consumer of data
object tags are users, users may also remove any tag from a live
server, no matter how the tag became associated with a data object
within a YANG module.
3.1. Module Design Tagging
A data node definition MAY indicate a set of data object tags to be
added by the module implementer. These design time tags are
indicated using a set of extension statements which include:
opm-tag extension statement: Classify management and operation data
into object type, property and metric three categories.
metric-scale extension statement: Provide an additional metric scale
(e.g., Measurement scaling factor of 10^0, 10^-3,10^3) information
associated with the performance metric data object within YANG
module. ;
metric-precision extension statement: Provide an additional metric
precision (e.g., the range -8 to -1, 0, the range 1 to 9)
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information associated with the performance metric data object
within YANG module. ;
operation-type extension statement: Statistics operation of
performance metric data object within YANG module, The statistics
operation include normal,min, max, average, sum,threshold.
metric-group extension statement: Provide correlation between
different metric information associated with data object within
YANG module.
data-source extension statement: The data source type (e.g.,
connectivity,resource, hardware ,qos,policy) associated with the
performance metric data object within YANG module.
multi-source-tag extension statement: Identify multiple source
aggregation tye(e.g., line card,member link in an aggregated
Ethernet interface) related to performance metric data object or
interface related data object). Two source aggregation source
types are supported, one is aggregation, the other is membership.
service-tag extension statement: Provide a service classification
information (e.g., tunnel, l3vpn,l2vpn) information associated
with data object within YANG module;
task-tag extension statement: Provide a task classification
information (e.g., fault management, performance measurement)
information associated with data object within YANG module.
Among these extension statements, the opm-tag extension
statement,meric-scale extension statement, metric-precision extension
statement,operation-type extension statement are performance meric
related while metric-group extension statement,data-source extension
statement, multi-source-tag extension statement, service-tag
extension statement, task-tag extension statement are context
information related.
If the data node is defined in an IETF standards track document, the
data object tags MUST be IETF Tags (2.1). Thus, new data object can
drive the addition of new IETF tags to the IANA registry defined in
Section 7.2, and the IANA registry can serve as a check against
duplication.
3.2. Implementation Tagging
An implementation MAY include additional tags associated with data
object within a YANG module. These tags SHOULD be IETF Tags (i.e.,
registered) or vendor specific tags.
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3.3. User Tagging
Data object tags of any kind, with or without a prefix, can be
assigned and removed by the user from a live server using normal
configuration mechanisms. In order to remove a data object tag from
the operational datastore, the user adds a matching "masked-tag"
entry for a given data object within the ietf-data-object-tags
Module.
4. Tags Module Structure
4.1. Tags Module Tree
The tree associated with the "ietf-data-object-tags" module follows.
The meaning of the symbols can be found in [RFC8340].
module: ietf-data-object-tags
augment /tags:module-tags/tags:module:
+--rw data-object-tags
+--rw data-object* [object-name]
+--rw object-name nacm:node-instance-identifier
+--rw tag* tags:tag
+--rw masked-tag* tags:tag
5. YANG Module
<CODE BEGINS> file "ietf-data-object-tags@2019-05-03.yang"
module ietf-data-object-tags {
yang-version 1.1;
namespace "urn:ietf:params:xml:ns:yang:ietf-data-object-tags";
prefix ntags;
import ietf-netconf-acm {
prefix nacm;
}
import ietf-module-tags {
prefix tags;
}
organization
"IETF NetMod Working Group (NetMod)";
contact
"WG Web: <https://tools.ietf.org/wg/netmod/>
WG List: <mailto:netmod@ietf.org>
Editor: Qin Wu <mailto:bill.wu@huawei.com>
Editor: Benoit Claise <mailto:bclaise@cisco.com>
Editor: Liang Geng <mailto:gengliang@chinamobile.com>
Editor: Zongpeng Du <mailto:duzongpeng@chinamobile.com>";
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description
"This module describes a mechanism associating self-explanation
tags with YANG data object within YANG modules. Tags may be IANA
assigned or privately defined.
Copyright (c) 2020 IETF Trust and the persons identified as
authors of the code. All rights reserved.
Redistribution and use in source and binary forms, with or
without modification, is permitted pursuant to, and subject to
the license terms contained in, the Simplified BSD License set
forth in Section 4.c of the IETF Trust's Legal Provisions
Relating to IETF Documents
(https://trustee.ietf.org/license-info).
This version of this YANG module is part of RFC XXXX
(https://tools.ietf.org/html/rfcXXXX); see the RFC itself for
full legal notices.";
revision 2019-05-03 {
description
"Initial revision.";
reference
"RFC XXXX: YANG Data Object Tags";
}
typedef metric-precision {
type int8 {
range "-8 .. 9";
}
description
"A node using this data type represents a sensor value
precision range.
A node of this type SHOULD be defined together with nodes of
type measurement-units and type measurement-scale. Together,
associated nodes of these three types are used to identify the
semantics of a node of type sensor-value.
If a node of this type contains a value in the range 1 to 9,
it represents the number of decimal places in the fractional
part of an associated sensor-value fixed-point number.
If a node of this type contains a value in the range -8 to -1,
it represents the number of accurate digits in the associated
sensor-value fixed-point number.
The value zero indicates the associated sensor-value node is
not a fixed-point number.
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Server implementers must choose a value for the associated
sensor-value-precision node so that the precision and accuracy
of the associated sensor-value node is correctly indicated.
For example, a component representing a temperature sensor
that can measure 0 to 100 degrees C in 0.1 degree
increments, +/- 0.05 degrees, would have a
sensor-value-precision value of '1', a sensor-value-scale
value of 'units', and a sensor-value ranging from '0' to
'1000'. The sensor-value would be interpreted as
'degrees C * 10'.";
reference
"RFC 3433: Entity Sensor Management Information Base -
EntitySensorPrecision";
}
typedef metric-scale {
type enumeration {
enum yocto {
value 1;
description
"Measurement scaling factor of 10^-24.";
}
enum zepto {
value 2;
description
"Measurement scaling factor of 10^-21.";
}
enum atto {
value 3;
description
"Measurement scaling factor of 10^-18.";
}
enum femto {
value 4;
description
"Measurement scaling factor of 10^-15.";
}
enum pico {
value 5;
description
"Measurement scaling factor of 10^-12.";
}
enum nano {
value 6;
description
"Measurement scaling factor of 10^-9.";
}
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enum micro {
value 7;
description
"Measurement scaling factor of 10^-6.";
}
enum milli {
value 8;
description
"Measurement scaling factor of 10^-3.";
}
enum units {
value 9;
description
"Measurement scaling factor of 10^0.";
}
enum kilo {
value 10;
description
"Measurement scaling factor of 10^3.";
}
enum mega {
value 11;
description
"Measurement scaling factor of 10^6.";
}
enum giga {
value 12;
description
"Measurement scaling factor of 10^9.";
}
enum tera {
value 13;
description
"Measurement scaling factor of 10^12.";
}
enum peta {
value 14;
description
"Measurement scaling factor of 10^15.";
}
enum exa {
value 15;
description
"Measurement scaling factor of 10^18.";
}
enum zetta {
value 16;
description
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"Measurement scaling factor of 10^21.";
}
enum yotta {
value 17;
description
"Measurement scaling factor of 10^24.";
}
}
description
"A node using this data type represents a data scaling factor,
represented with an International System of Units (SI) prefix.
The actual data units are determined by examining a node of
this type together with the associated sensor-value-type.
A node of this type SHOULD be defined together with nodes of
type sensor-value-type and type sensor-value-precision.
Together, associated nodes of these three types are used to
identify the semantics of a node of type sensor-value.";
reference
"RFC 3433: Entity Sensor Management Information Base -
EntitySensorDataScale";
}
extension opm-tag {
argument tag;
description
"The argument 'tag' is of type 'tag'. This extension statement
is used by module authors to indicate the opm tags that SHOULD be
added automatically by the system. Opm Tag is used to classify
operation and management data into object type, property, and metric
As such the origin of the value for the pre-defined tags should be
set to 'system'[RFC8342].";
}
extension metric-scale {
argument tag;
description
"The argument 'tag' is of type 'tag'. The metric-scale tag can be
used to provide an additional data scale factor(e.g., Measurement
scaling factor of 10^0, 10^-3,10^3) information associated with
the performance metric data object.
A node using metric scale tag SHOULD be defined together with nodes of
type metric unit and type metric precision.
Together, associated nodes of these three types are used to
identify the semantics of the performance metric data object.";
reference
"RFC 3433: Entity Sensor Management Information Base -
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EntitySensorDataScale";
}
extension metric-precision {
argument tag;
description
"The argument 'tag' is of type 'tag'. The metric-precision can be
used to provide an additional sensor value precision range (e.g.,
the range -8 to -1, 0, the range 1 to 9) information associated
with the performance metric data object.
A node using metric precision tag SHOULD be defined together with
nodes of type metric unit and type metric scale. Together, associated
nodes of these three types are used to identify the semantics of the
performance metric data object.
If a node of this type contains a value in the range 1 to 9,
it represents the number of decimal places in the fractional
part of an associated sensor-value fixed-point number.
If a node of this type contains a value in the range -8 to -1,
it represents the number of accurate digits in the associated
sensor-value fixed-point number.
The value zero indicates the associated sensor-value node is
not a fixed-point number.
Server implementers must choose a value for the associated
metric precision tag so that the precision and accuracy
of the associated sensor-value node is correctly indicated.
For example, a component representing a temperature sensor
that can measure 0 to 100 degrees C in 0.1 degree
increments, +/- 0.05 degrees, would have a
sensor-value-precision value of '1', a sensor-value-scale
value of 'units', and a sensor-value ranging from '0' to
'1000'. The sensor-value would be interpreted as
'degrees C * 10'.";
reference
"RFC 3433: Entity Sensor Management Information Base -
EntitySensorDataScale";
}
extension operation-type {
argument tag;
description
"The argument 'tag' is of type 'tag'.The statistics-operation can be
used to provide an additional statistics operation type(e.g., sum,
min, max,sum,last, threshold) information associated with the performance metric
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data object.
If the operation type is threshold type, the corresponding
data object support threshold handling,e.g.,scan all interfaces
for a certain type every 5 seconds and check the counters or
status to cross threshold, return an array of interface entries
that match the search.
If the operation type is average,min,max,sum,last,
it indicate the data object supports statistics operation, e.g.,
scan all interfaces for a certain type every 5 seconds up to 60 seconds,
only return min, average, max, sum value of specific data object rather than
the values that are current at the end of 60 seconds.";
}
extension metric-group {
argument tag;
description
"The argument 'tag' is of type 'tag'.The metric-group can be
used to provide correlation between different metric information
associated with YANG data object.";
}
extension service-tag {
argument tag;
description
"The argument 'tag' is of type 'tag'.The service-tag can be
used to provide a service classification information (e.g., tunnel,
l3vpn,l2vpn) information associated with YANG data object.";
}
extension task-tag {
argument tag;
description
"The argument 'tag' is of type 'tag'.The task-tag can be
used to provide a task classification information (e.g., fault management,
performance measurement) information associated with YANG data object.";
}
extension data-source {
argument tag;
description
"The argument 'tag' is of type 'tag'.The data-source-type can be
used to provide an additional data source type (e.g., connectivity,
resource, hardware,qos,policy) information associated with
the performance metric data object.";
}
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extension multi-source-tag {
argument tag;
description
"The argument 'tag' is of type 'tag'.The multi-source-tag can be
used to identify multiple source aggregation tye(e.g., line card,
member link in an aggregated Ethernet interface) related to performance
metric data object or interface related to data object).
Two source aggregation source types are supported, one is aggregation
which groups data from two or multiple different data objects,
the other is membership which identify each data object(e.g.,
linecard, member link from multiple source aggregation.";
}
augment "/tags:module-tags/tags:module" {
description
"Augment the Module Tags module with data object tag attributes";
container data-object-tags {
description
"Contains the list of data objects and their associated self explanation tags";
list data-object {
key "object-name";
description
"A list of self explanation nodes and their associated tags";
leaf object-name {
type nacm:node-instance-identifier;
mandatory true;
description
"The YANG data object name.";
}
leaf-list tag {
type tags:tag;
description
"Tags associated with the data object within YANG module. See
the IANA 'YANG Data Object Tag Prefixes' registry for reserved
prefixes and the IANA'IETF YANG Data Object Tags' registry for
IETF tags.
The 'operational' state [RFC8342] view of this list is
constructed using the following steps:
1) System tags (i.e., tags of 'system' origin) are added.
2) User configured tags (i.e., tags of 'intended' origin)
are added.
3) Any tag that is equal to a masked-tag is removed.";
}
leaf-list masked-tag {
type tags:tag;
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description
"The list of tags that should not be associated with the data
object within YANG module. The user can remove (mask) tags from the
operational state datastore [RFC8342] by adding them to
this list. It is not an error to add tags to this list
that are not associated with the data object within YANG module,
but they have no operational effect.";
}
}
}
}
}
<CODE ENDS>
6. Guidelines to Model Writers
This section updates [RFC8407].
6.1. Define Standard Tags
A module MAY indicate, using node-tag extension statements, a set of
tags that are to be automatically associated with it (i.e., not added
through configuration).
module example-module-A {
//...
import ietf-data-node-tags { prefix ntags; }
container top {
ntags:opm-tag "ietf:object-type";
list X {
leaf foo {
ntags:opm-tag "ietf:property";
}
}
container Y {
ntags:opm-tag "ietf:metric";
leaf bar {
ntags:operation-type "ietf:avg";
ntags:metric-scale "ietf:milli";
}
}
}
// ...
}
The module writer can use existing standard tags, or use new tags
defined in the model definition, as appropriate. For IETF
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standardized modules new data object tags MUST be assigned in the
IANA registry defined below, see Section Section 7.2.
7. IANA Considerations
7.1. YANG Data Object Tag Prefixes Registry
IANA is asked to create a new registry "YANG Data Object Tag
Prefixes" grouped under a new "Protocol" category named "YANG Data
Object Tag Prefixes".
This registry allocates tag prefixes. All YANG Data Object Tags
SHOULD begin with one of the prefixes in this registry.
Prefix entries in this registry should be short strings consisting of
lowercase ASCII alpha-numeric characters and a final ":" character.
The allocation policy for this registry is Specification Required
[RFC8126]. The Reference and Assignee values should be sufficient to
identify and contact the organization that has been allocated the
prefix.
The initial values for this registry are as follows.
+----------+----------------------------------+-----------+----------+
| Prefix | Description | Reference | Assignee |
+----------+----------------------------------+-----------+----------+
| ietf: | IETF Tags allocated in the IANA | [This | IETF |
| | IETF YANG Data Object Tags registry document]| |
| | | | |
|vendor: | Non-registered tags allocated by | [This | IETF |
| | the module implementer. | document] | |
| | | | |
| user: | Non-registered tags allocated by | [This | IETF |
| | and for the user. | document] | |
+----------+----------------------------------+-----------+----------+
Other standards organizations (SDOs) wishing to allocate their own
set of tags should allocate a prefix from this registry.
7.2. IETF YANG Data Object Tags Registry
IANA is asked to create nine new registries "IETF Data Object
Tags","IETF Metric Precision Tags","IETF Metric Scale Tags","IETF
Operation Type Tags","IETF Metric Group Tags","IETF Data Source
Tags","IETF Multiple Source Tags","IETF Service Tags","IETF Task
Tags" grouped under a new "Protocol" category. These nine registries
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should be included below "YANG Data Object Tag Prefixes" when listed
on the same page.
Nine registries allocate tags that have the registered prefix
"ietf:". New values should be well considered and not achievable
through a combination of already existing IETF tags.
The allocation policy for these four registries is IETF Review
[RFC8126].
The initial values for these nine registries are as follows.
+----------------------------+--------------------------+-----------+
| OPM Tag | Description | Reference |
+----------------------------+--------------------------+-----------+
| | | |
| ietf:object-type | Relates to object type | [This |
| | (e.g., interfaces). | document] |
| | | |
| ietf:metric | Relates to performance | [This |
| | metric info | document] |
| | (e.g., ifstatistics). | |
| | | |
| | | |
| ietf:property | Represents a object | [This |
| | property | document] |
| | (e.g.,ifindex). | |
+----------------------------+--------------------------+-----------+
+----------------------------+--------------------------+-----------+
| Metric Precision Tag | Description | Reference |
+----------------------------+--------------------------+-----------+
|ietf:minus-eight |Relates to metric precision [This |
| | of performance metric | document] |
| | | |
|ietf:minus-seven |Relates to metric precision [This |
| | of performance metric | document] |
| | | |
|ietf:minus-six |Relates to metric precision [This |
| | of performance metric | document] |
| | | |
|ietf:minus-five |Relates to metric precision [This |
| | of performance metric | document] |
| | | |
|ietf:minus-four |Relates to metric precision [This |
| | of performance metric | document] |
| | | |
|ietf:minus-three |Relates to metric precision [This |
| | of performance metric | document] |
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| | | |
|ietf:minus-two |Relates to metric precision [This |
| | of performance metric | document] |
| | | |
|ietf:minus-one |Relates to metric precision [This |
| | of performance metric | document] |
| | | |
|ietf:zero |Relates to metric precision [This |
| | of performance metric | document] |
| | | |
|ietf:one |Relates to metric precision [This |
| | of performance metric | document] |
| | | |
|ietf:two |Relates to metric precision [This |
| | of performance metric | document] |
| | | |
|ietf:three |Relates to metric precision [This |
| | of performance metric | document] |
| | | |
|ietf:four | Relates to metric precision [This |
| | of performance metric | document] |
| | | |
|ietf:five | Relates to metric precision [This |
| | of performance metric | document] |
| | | |
|ietf:six | Relates to metric precision [This |
| | of performance metric | document] |
| | | |
|ietf:seven | Relates to metric precision [This |
| | of performance metric | document] |
| | | |
|ietf:eight | Relates to metric precision [This |
| | of performance metric | document] |
| | | |
|ietf:nine | Relates to metric precision [This |
| | of performance metric | document] |
+----------------------------+--------------------------+-----------+
+----------------------------+--------------------------+-----------+
| Metric Scale Tag | Description | Reference |
+----------------------------+--------------------------+-----------+
|ietf:yocto | Relates to metric scale | [This |
| | of performance metric | document] |
| | | |
|ietf:zepto | Relates to metric scale | [This |
| | of performance metric | document] |
| | | |
|ietf:atto | Relates to metric scale | [This |
| | of performance metric | document] |
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| | | |
|ietf: femto | Relates to metric scale | [This |
| | of performance metric | document] |
| | | |
|ietf: pico | Relates to metric scale | [This |
| | of performance metric | document] |
| | | |
|ietf: nano | Relates to metric scale | [This |
| | of performance metric | document] |
| | | |
|ietf: micro | Relates to metric scale | [This |
| | of performance metric | document] |
| | | |
|ietf: milli | Relates to metric scale | [This |
| | of performance metric | document] |
| | | |
|ietf: units | Relates to metric scale | [This |
| | of performance metric | document] |
| | | |
|ietf: kilo | Relates to metric scale | [This |
| | of performance metric | document] |
| | | |
|ietf: mega | Relates to metric scale | [This |
| | of performance metric | document] |
| | | |
|ietf: giga | Relates to metric scale | [This |
| | of performance metric | document] |
| | | |
|ietf: tera | Relates to metric scale | [This |
| | of performance metric | document] |
| | | |
|ietf: peta | Relates to metric scale | [This |
| | of performance metric | document] |
| | | |
|ietf: exa | Relates to metric scale | [This |
| | of performance metric | document] |
| | | |
|ietf: zetta | Relates to metric scale | [This |
| | of performance metric | document] |
| | | |
|ietf: yotta | Relates to metric scale | [This |
| | of performance metric | document] |
+----------------------------+--------------------------+-----------+
+----------------------------+--------------------------+-----------+
| Operation Type Tag | Description | Reference |
+----------------------------+--------------------------+-----------+
|ietf:normal | Relates to statistics | [This |
| | operation(e.g.,average, | document] |
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| | min, max, normal,etc) | |
|ietf:avg | Relates to statistics | [This |
| | operation(e.g.,average, | document] |
| | min, max, sum,etc) | |
|ietf:sum | Relates to statistics | [This |
| | operation(e.g.,average, | document] |
| | min, max, sum,etc) | |
|ietf:min | Relates to statistics | [This |
| | operation(e.g.,average, | document] |
| | min, max, sum,etc) | |
|ietf:max | Relates to statistics | [This |
| | operation(e.g.,average, | document] |
| | min, max, sum,etc) | |
|ietf:threshold | Relates to statistics | [This |
| | operation(e.g.,average, | document] |
| | min, max, threshold,etc) | |
+----------------------------+--------------------------+-----------+
+----------------------------+--------------------------+-----------+
| Metric Group Tag | Description | Reference |
+----------------------------+--------------------------+-----------+
| ietf:delay | Represent metric group | [This |
| |(e.g., loss, jitter,delay)| document] |
| | | |
| ietf:jitter | Represent metric group | [This |
| |(e.g., loss, jitter,delay)| document] |
| | | |
| ietf:loss | Represent metric group | [This |
| |(e.g., loss, jitter,delay)| document] |
+----------------------------+--------------------------+-----------+
+----------------------------+--------------------------+-----------+
| Multiple Source Tag | Description | Reference |
+----------------------------+--------------------------+-----------+
|ietf:member |Relates to multiple source| [This |
| |aggregation type(e.g., | document] |
| |lag, linecard, sub inf) | |
| | | |
|ietf:agg |Relates to multiple source| [This |
| |aggregation type(e.g.,agg)| document] |
+----------------------------+--------------------------+-----------+
+----------------------------+--------------------------+-----------+
| Data Source Tag | Description | Reference |
+----------------------------+--------------------------+-----------+
| | | |
| ietf:service-flow | Relates to data source | [This |
| | type(e.g., microburst). | document] |
| | | |
| ietf:topo | Relates to data source | [This |
| | type(e.g., topology). | document] |
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| | | |
| ietf:resource | Relates to data source | [This |
| | type info | document] |
| | (e.g., interface,queue). | |
| | | |
| ietf:policy | Relates to data source | [This |
| | type info | document] |
| |(e.g., acl, routing policy| |
| | | |
| ietf:hardware | Relates to data source | [This |
| | type | document] |
| | (e.g.,optical module). | |
+----------------------------+--------------------------+-----------+
+----------------------------+--------------------------+-----------+
| Service Tag | Description | Reference |
+----------------------------+--------------------------+-----------+
|ietf:l3vpn | Relates to service | [This |
| | offering(e.g.,l3vpn | document] |
| | l2vpn,tunnel,etc) | |
|ietf:l2vpn | Relates to service | [This |
| | offering(e.g.,l3vpn | document] |
| | l2vpn,tunnel,etc) | |
|ietf:te-tunnel | Relates to service | [This |
| | offering(e.g.,l3vpn | document] |
| | l2vpn,tunnel,etc) | |
+----------------------------+--------------------------+-----------+
+----------------------------+--------------------------+-----------+
| Task Tag | Description | Reference |
+----------------------------+--------------------------+-----------+
|ietf:vpn-diag | Relates to vpn serivce | [This |
| | diagonostic function | document] |
| | | |
|ietf:vpn-fullfilment | Relates to vpn service | [This |
| | fullfillment function | document] |
| | | |
|ietf:vpn-assurance | Relates to vpn service | [This |
| | assurance function | document] |
+----------------------------+--------------------------+-----------+
7.3. Updates to the IETF XML Registry
This document registers a URI in the "IETF XML Registry" [RFC3688].
Following the format in [RFC3688], the following registration has
been made:
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URI:
urn:ietf:params:xml:ns:yang:ietf-data-object-tags
Registrant Contact:
The IESG.
XML:
N/A; the requested URI is an XML namespace.
7.4. Updates to the YANG Module Names Registry
This document registers one YANG module in the "YANG Module Names"
registry [RFC6020]. Following the format in [RFC6020], the following
registration has been made:
name:
ietf-data-object-tags
namespace:
urn:ietf:params:xml:ns:yang:ietf-data-object-tags
prefix:
ntags
reference:
RFC XXXX (RFC Ed.: replace XXX with actual RFC number and remove
this note.)
8. Security Considerations
The YANG module defined in this memo is designed to be accessed via
the NETCONF protocol [RFC6241]. The lowest NETCONF layer is the
secure transport layer and the mandatory-to-implement secure
transport is SSH [RFC6242].
This document adds the ability to associate data object tag meta-data
with data object within the YANG modules. This document does not
define any actions based on these associations, and none are yet
defined, and therefore it does not by itself introduce any new
security considerations.
Users of the data object tag-meta data may define various actions to
be taken based on the data object tag meta-data. These actions and
their definitions are outside the scope of this document. Users will
need to consider the security implications of any actions they choose
to define.
9. Contributors
The authors would like to thank Ran Tao for his major contributions
to the initial modeling and use cases.
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10. References
10.1. Normative References
[RFC2119] Bradner, S., "Key words for use in RFCs to Indicate
Requirement Levels", BCP 14, RFC 2119,
DOI 10.17487/RFC2119, March 1997,
<https://www.rfc-editor.org/info/rfc2119>.
[RFC7950] Bjorklund, M., Ed., "The YANG 1.1 Data Modeling Language",
RFC 7950, DOI 10.17487/RFC7950, August 2016,
<https://www.rfc-editor.org/info/rfc7950>.
[RFC8126] Cotton, M., Leiba, B., and T. Narten, "Guidelines for
Writing an IANA Considerations Section in RFCs", BCP 26,
RFC 8126, DOI 10.17487/RFC8126, June 2017,
<https://www.rfc-editor.org/info/rfc8126>.
[RFC8174] Leiba, B., "Ambiguity of Uppercase vs Lowercase in RFC
2119 Key Words", BCP 14, RFC 8174, DOI 10.17487/RFC8174,
May 2017, <https://www.rfc-editor.org/info/rfc8174>.
[RFC8342] Bjorklund, M., Schoenwaelder, J., Shafer, P., Watsen, K.,
and R. Wilton, "Network Management Datastore Architecture
(NMDA)", RFC 8342, DOI 10.17487/RFC8342, March 2018,
<https://www.rfc-editor.org/info/rfc8342>.
[RFC8407] Bierman, A., "Guidelines for Authors and Reviewers of
Documents Containing YANG Data Models", BCP 216, RFC 8407,
DOI 10.17487/RFC8407, October 2018,
<https://www.rfc-editor.org/info/rfc8407>.
10.2. Informative References
[RFC3688] Mealling, M., "The IETF XML Registry", BCP 81, RFC 3688,
DOI 10.17487/RFC3688, January 2004,
<https://www.rfc-editor.org/info/rfc3688>.
[RFC6020] Bjorklund, M., Ed., "YANG - A Data Modeling Language for
the Network Configuration Protocol (NETCONF)", RFC 6020,
DOI 10.17487/RFC6020, October 2010,
<https://www.rfc-editor.org/info/rfc6020>.
[RFC6241] Enns, R., Ed., Bjorklund, M., Ed., Schoenwaelder, J., Ed.,
and A. Bierman, Ed., "Network Configuration Protocol
(NETCONF)", RFC 6241, DOI 10.17487/RFC6241, June 2011,
<https://www.rfc-editor.org/info/rfc6241>.
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[RFC6242] Wasserman, M., "Using the NETCONF Protocol over Secure
Shell (SSH)", RFC 6242, DOI 10.17487/RFC6242, June 2011,
<https://www.rfc-editor.org/info/rfc6242>.
[RFC8340] Bjorklund, M. and L. Berger, Ed., "YANG Tree Diagrams",
BCP 215, RFC 8340, DOI 10.17487/RFC8340, March 2018,
<https://www.rfc-editor.org/info/rfc8340>.
Appendix A. NETCONF Example
The following is a fictional NETCONF example result from a query of
the data object tags list. For the sake of brevity only a few module
results are imagined.
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<ns0:data xmlns:ns0="urn:ietf:params:xml:ns:netconf:base:1.0">
<t:module-tags xmlns:t="urn:ietf:params:xml:ns:yang:ietf-module-tags">
<t:module>
<t:name>ietf-interfaces</t:name>
<s:data-object-tags xmlns:s="urn:ietf:params:xml:ns:yang:ietf-data-object-tags">
<s:data-object>
<s:object-name>
/if:interfaces/if:interface/if:statistics/if:in-errors
</s:object-name>
<s:tag>ietf:metric</s:tag>
<s:tag>ietf:avg</s:tag>
</s:data-object>
<s:data-object>
<s:object-name>/if:interfaces/if:interface/if:last-change</s:object-name>
<s:tag>ietf:property</s:tag>
</s:data-object>
<s:data-object>
<s:object-name>/if:interfaces/if:interface/if:type</s:object-name>
<s:tag>ietf:object-type</s:tag>
</s:data-object>
</s:data-object-tags>
</t:module>
<t:module>
<t:name>ietf-ip</t:name>
<s:data-object-tags xmlns:s="urn:ietf:params:xml:ns:yang:ietf-data-object-tags">
<s:data-object>
<s:object-name>/if:interfaces/if:interface/ip:ipv4/ip:mtu</s:object-name>
<s:tag>ietf:metric</s:tag>
<s:tag>ietf:normal</s:tag>
</s:data-object>
<s:data-object>
<s:object-name>/if:interfaces/if:interface/ip:ipv4/ip:enable</s:object-name>
<s:tag>ietf:property</s:tag>
</s:data-object>
<s:data-object>
<s:object-name>/if:interfaces/if:interface/ip:ipv4</s:object-name>
<s:tag>ietf:object-type</s:tag>
</s:data-object>
</s:data-object-tags>
</t:module>
</t:module-tags>
</ns0:data>
Appendix B. Non-NMDA State Module
As per [RFC8407] the following is a non-NMDA module to support
viewing the operational state for non-NMDA compliant servers.
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<CODE BEGINS> file "ietf-data-object-tags-state@2019-05-03.yang"
module ietf-data-object-tags-state {
yang-version 1.1;
namespace "urn:ietf:params:xml:ns:yang:ietf-data-object-tags";
prefix ntags;
import ietf-netconf-acm {
prefix nacm;
}
import ietf-module-tags {
prefix tags;
}
organization
"IETF NetMod Working Group (NetMod)";
contact
"WG Web: <https://tools.ietf.org/wg/netmod/>
WG List: <mailto:netmod@ietf.org>
Editor: Qin Wu <mailto:bill.wu@huawei.com>
Editor: Benoit Claise <mailto:bclaise@cisco.com>
Editor: Liang Geng <mailto:gengliang@chinamobile.com>
Editor: Zongpeng Du <mailto:duzongpeng@chinamobile.com>";
description
"This module describes a mechanism associating self-explanation
tags with YANG data object within YANG modules. Tags may be IANA
assigned or privately defined.
Copyright (c) 2020 IETF Trust and the persons identified as
authors of the code. All rights reserved.
Redistribution and use in source and binary forms, with or
without modification, is permitted pursuant to, and subject to
the license terms contained in, the Simplified BSD License set
forth in Section 4.c of the IETF Trust's Legal Provisions
Relating to IETF Documents
(https://trustee.ietf.org/license-info).
This version of this YANG module is part of RFC XXXX
(https://tools.ietf.org/html/rfcXXXX); see the RFC itself for
full legal notices.";
revision 2019-05-03 {
description
"Initial revision.";
reference
"RFC XXXX: YANG Data Object Tags";
}
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typedef metric-precision {
type int8 {
range "-8 .. 9";
}
description
"A node using this data type represents a sensor value
precision range.
A node of this type SHOULD be defined together with nodes of
type measurement-units and type measurement-scale. Together,
associated nodes of these three types are used to identify the
semantics of a node of type sensor-value.
If a node of this type contains a value in the range 1 to 9,
it represents the number of decimal places in the fractional
part of an associated sensor-value fixed-point number.
If a node of this type contains a value in the range -8 to -1,
it represents the number of accurate digits in the associated
sensor-value fixed-point number.
The value zero indicates the associated sensor-value node is
not a fixed-point number.
Server implementers must choose a value for the associated
sensor-value-precision node so that the precision and accuracy
of the associated sensor-value node is correctly indicated.
For example, a component representing a temperature sensor
that can measure 0 to 100 degrees C in 0.1 degree
increments, +/- 0.05 degrees, would have a
sensor-value-precision value of '1', a sensor-value-scale
value of 'units', and a sensor-value ranging from '0' to
'1000'. The sensor-value would be interpreted as
'degrees C * 10'.";
reference
"RFC 3433: Entity Sensor Management Information Base -
EntitySensorPrecision";
}
typedef metric-scale {
type enumeration {
enum yocto {
value 1;
description
"Measurement scaling factor of 10^-24.";
}
enum zepto {
value 2;
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description
"Measurement scaling factor of 10^-21.";
}
enum atto {
value 3;
description
"Measurement scaling factor of 10^-18.";
}
enum femto {
value 4;
description
"Measurement scaling factor of 10^-15.";
}
enum pico {
value 5;
description
"Measurement scaling factor of 10^-12.";
}
enum nano {
value 6;
description
"Measurement scaling factor of 10^-9.";
}
enum micro {
value 7;
description
"Measurement scaling factor of 10^-6.";
}
enum milli {
value 8;
description
"Measurement scaling factor of 10^-3.";
}
enum units {
value 9;
description
"Measurement scaling factor of 10^0.";
}
enum kilo {
value 10;
description
"Measurement scaling factor of 10^3.";
}
enum mega {
value 11;
description
"Measurement scaling factor of 10^6.";
}
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enum giga {
value 12;
description
"Measurement scaling factor of 10^9.";
}
enum tera {
value 13;
description
"Measurement scaling factor of 10^12.";
}
enum peta {
value 14;
description
"Measurement scaling factor of 10^15.";
}
enum exa {
value 15;
description
"Measurement scaling factor of 10^18.";
}
enum zetta {
value 16;
description
"Measurement scaling factor of 10^21.";
}
enum yotta {
value 17;
description
"Measurement scaling factor of 10^24.";
}
}
description
"A node using this data type represents a data scaling factor,
represented with an International System of Units (SI) prefix.
The actual data units are determined by examining a node of
this type together with the associated sensor-value-type.
A node of this type SHOULD be defined together with nodes of
type sensor-value-type and type sensor-value-precision.
Together, associated nodes of these three types are used to
identify the semantics of a node of type sensor-value.";
reference
"RFC 3433: Entity Sensor Management Information Base -
EntitySensorDataScale";
}
extension opm-tag {
argument tag;
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description
"The argument 'tag' is of type 'tag'. This extension statement
is used by module authors to indicate the opm tags that SHOULD be
added automatically by the system. Opm Tag is used to classify
operation and management data into object type, property, and
metric. As such the origin of the value for the pre-defined tags
should be set to 'system'[RFC8342].";
}
extension metric-scale {
argument tag;
description
"The argument 'tag' is of type 'tag'. The metric-scale tag can be
used to provide an additional data scale factor(e.g., Measurement
scaling factor of 10^0, 10^-3,10^3) information associated with
the performance metric data object.
A node using metric scale tag SHOULD be defined together with nodes of
type metric unit and type metric precision.
Together, associated nodes of these three types are used to
identify the semantics of the performance metric data object.";
reference
"RFC 3433: Entity Sensor Management Information Base -
EntitySensorDataScale";
}
extension metric-precision {
argument tag;
description
"The argument 'tag' is of type 'tag'. The metric-precision can be
used to provide an additional sensor value precision range (e.g.,
the range -8 to -1, 0, the range 1 to 9) information associated
with the performance metric data object.
A node using metric precision tag SHOULD be defined together with
nodes of type metric unit and type metric scale. Together, associated
nodes of these three types are used to identify the semantics of the
performance metric data object.
If a node of this type contains a value in the range 1 to 9,
it represents the number of decimal places in the fractional
part of an associated sensor-value fixed-point number.
If a node of this type contains a value in the range -8 to -1,
it represents the number of accurate digits in the associated
sensor-value fixed-point number.
The value zero indicates the associated sensor-value node is
not a fixed-point number.
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Server implementers must choose a value for the associated
metric precision tag so that the precision and accuracy
of the associated sensor-value node is correctly indicated.
For example, a component representing a temperature sensor
that can measure 0 to 100 degrees C in 0.1 degree
increments, +/- 0.05 degrees, would have a
sensor-value-precision value of '1', a sensor-value-scale
value of 'units', and a sensor-value ranging from '0' to
'1000'. The sensor-value would be interpreted as
'degrees C * 10'.";
reference
"RFC 3433: Entity Sensor Management Information Base -
EntitySensorDataScale";
}
extension operation-type {
argument tag;
description
"The argument 'tag' is of type 'tag'.The statistics-operation can be
used to provide an additional statistics operation type(e.g., sum,
min, max,sum,last, threshold) information associated with the performance metric
data object.
If the operation type is threshold type, the corresponding
data object support threshold handling,e.g.,scan all interfaces
for a certain type every 5 seconds and check the counters or
status to cross threshold, return an array of interface entries
that match the search.
If the operation type is average,min,max,sum,last,
it indicate the data object supports statistics operation, e.g.,
scan all interfaces for a certain type every 5 seconds up to 60 seconds,
only return min, average, max, sum value of specific data object rather than
the values that are current at the end of 60 seconds.";
}
extension service-tag {
argument tag;
description
"The argument 'tag' is of type 'tag'.The service-tag can be
used to provide a service classification information (e.g., tunnel,
l3vpn,l2vpn) information associated with YANG data object.";
}
extension task-tag {
argument tag;
description
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"The argument 'tag' is of type 'tag'.The task-tag can be
used to provide a task classification information (e.g., fault management,
performance measurement) information associated with YANG data object.";
}
extension data-source {
argument tag;
description
"The argument 'tag' is of type 'tag'.The data-source-type can be
used to provide an additional data source type (e.g., connectivity,
resource, hardware,qos,policy) information associated with
the performance metric data object tag.";
}
extension multi-source-tag {
argument tag;
description
"The argument 'tag' is of type 'tag'.The multi-source-tag can be
used to identify multiple source aggregation tye(e.g., line card,
member link in an aggregated Ethernet interface) related to performance
metric data objects or interface related data objects).
Two source aggregation source types are supported, one is aggregation
which groups data from two or multiple different data objects,
the other is membership which identify each data object(e.g.,
linecard, member link from multiple source aggregation.";
}
augment "/tags:module-tags/tags:module" {
description
"Augment the Module Tags module with data object tag attributes";
container data-object-tags {
config false;
status deprecated;
description
"Contains the list of data objects and their associated self explanation tags";
list data-object {
key "object-name";
status deprecated;
description
"A list of self explanation nodes and their associated tags";
leaf object-name {
type nacm:node-instance-identifier;
mandatory true;
status deprecated;
description
"The YANG data object name.";
}
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leaf-list tag {
type tags:tag;
status deprecated;
description
"Tags associated with the data object within YANG module. See
the IANA 'YANG Data Object Tag Prefixes' registry for reserved
prefixes and the IANA'IETF YANG Data Object Tags' registry for
IETF tags.
The 'operational' state [RFC8342] view of this list is
constructed using the following steps:
1) System tags (i.e., tags of 'system' origin) are added.
2) User configured tags (i.e., tags of 'intended' origin)
are added.
3) Any tag that is equal to a masked-tag is removed.";
}
leaf-list masked-tag {
type tags:tag;
status deprecated;
description
"The list of tags that should not be associated with the data
object within YANG module. The user can remove (mask) tags from the
operational state datastore [RFC8342] by adding them to
this list. It is not an error to add tags to this list
that are not associated with the data object within YANG module,
but they have no operational effect.";
}
}
}
}
}
<CODE ENDS>
Appendix C. Targeted data object subscription example
The following subsections provides targeted data object subscription
example.The subscription "id" values of 22 used below is just an
example. In production, the actual values of "id" might not be small
integers.
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+-----------+ +-----------+
| Subscriber| | Publisher |
+------+----+ +-----+-----+
| |
| |
|Telemery data Tagging Advertisement
| (node-selector, opm-tag = metric)
|<---------------------------------|
| |
| establish-subscription |
| (datasore,node-selector) |
|--------------------------------->|
| |
| |
| |
| RPC Reply: OK, id = 22 |
|<---------------------------------|
| |
| |
| |
| Notification Message (for 22) |
| <--------------------------------|
| |
| |
| |
The publisher advertise telemetry data object capability to the
subscriber to instruct the receiver to subscribe targeted data object
with specific characteristics (e.g., performance metric data object)
and specific data path corresponding to the targeted data object.
The following XML example [W3C.REC-xml-20081126] illustrates the
advertisment of the list of available target objects:
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<?xml version="1.0" encoding="UTF-8"?>
<instance-data-set xmlns=\
"urn:ietf:params:xml:ns:yang:ietf-yang-instance-data">
<name>acme-router-notification-capabilities</name>
<content-schema>
<module>ietf-system-capabilities@2020-03-23</module>
<module>ietf-notification-capabilities@2020-03-23</module>
<module>ietf-data-export-capabilities@2020-03-23</module>
</content-schema>
<!-- revision date, contact, etc. -->
<description>Defines the notification capabilities of an acme-router.
The router only has running, and operational datastores.
Every change can be reported on-change from running, but
only config=true nodes and some config=false data from operational.
Statistics are not reported based on timer based trigger and counter
threshold based trigger.
</description>
<content-data>
<system-capabilities \
xmlns="urn:ietf:params:xml:ns:yang:ietf-system-capabilities" \
xmlns:inc=\
"urn:ietf:params:xml:ns:yang:ietf-notification-capabilities" \
xmlns:ds="urn:ietf:params:xml:ns:yang:ietf-datastores">
<datastore-capabilities>
<datastore>ds:operational</datastore>
<per-node-capabilities>
<node-selector>\
/if:interfaces/if:interface/if:statistics/if:in-errors\
</node-selector>
<sec:self-describing-capabilities>
<sec:self-tag-id>counter</sec:self-tag-id>
<sec:opm-tag>metric</sec:opm-tag>
<sec:operation-type>avg</sec:operation-type>
</sec:self-describing-capabilities>
</per-node-capabilities>
</datastore-capabilities>
</system-capabilities>
</content-data>
</instance-data-set>
With telemetry data tagging information carried in the Telemetry data
Tagging Advertisement, the subscriber identifies targeted data object
and associated data path to the datastore node and sends a establish-
subscription RPC to subscribe specific data objects that are
interests to the client application from the publisher.
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<netconf:rpc message-id="101"
xmlns:netconf="urn:ietf:params:xml:ns:netconf:base:1.0">
<establish-subscription
xmlns="urn:ietf:params:xml:ns:yang:ietf-subscribed-notifications"
xmlns:yp="urn:ietf:params:xml:ns:yang:ietf-yang-push">
<yp:datastore
xmlns:ds="urn:ietf:params:xml:ns:yang:ietf-datastores">
ds:operational
</yp:datastore>
<yp:datastore-xpath-filter
xmlns:ex="https://example.com/sample-data/1.0">
/if:interfaces/if:interface/if:statistics/if:in-errors
</yp:datastore-xpath-filter>
<yp:periodic>
<yp:period>500</yp:period>
</yp:periodic>
</establish-subscription>
</netconf:rpc>
The publisher returns specific object type of operational state
subscribed by the client.
Authors' Addresses
Qin Wu
Huawei
101 Software Avenue, Yuhua District
Nanjing, Jiangsu 210012
China
Email: bill.wu@huawei.com
Benoit Claise
Cisco
De Kleetlaan 6a b1
Diegem 1831
Belgium
Email: bclaise@cisco.com
Liang Geng
China Mobile
32 Xuanwumen West St, Xicheng District
Beijing 10053
Email: gengliang@chinamobile.com
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Zongpeng Du
China Mobile
32 Xuanwumen West St, Xicheng District
Beijing 10053
Email: duzongpeng@chinamobile.com
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