ISO/IEC/IEEE 8802-1AS:2021/FDAmd 2

FINAL DRAFT
Amendment
ISO/IEC/IEEE
8802-1AS:2021/
FDAM 2
ISO/IEC JTC 1/SC 6
Information technology —
Secretariat: KATS
Telecommunications and
Voting begins on:
information exchange between
2026-03-13
systems — Local and metropolitan
Voting terminates on:
area networks —
2026-07-31
Part 1AS:
Second edition
Timing and synchronization for
2021-11
time-sensitive applications in
AMENDMENT 2
bridged local area networks
AMENDMENT 2: YANG data model
Technologies de l'information — Télécommunications et
échange d'information entre systèmes — Réseaux locaux et
métropolitains —
Partie 1AS: Temporisation et synchronisation pour les
applications sensibles au temps des réseaux locaux pontés
AMENDEMENT 2
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Reference number
ISO/IEC/IEEE 8802­1AS:2021/FDAM
2:2026(en) © IEEE 2026
FINAL DRAFT
ISO/IEC/IEEE 8802-1AS:2021/FDAM 2:2026(en)
Amendment
ISO/IEC/IEEE
8802-1AS:2021/
FDAM 2
ISO/IEC JTC 1/SC 6
Information technology —
Secretariat: KATS
Telecommunications and
Voting begins on:
information exchange between
2026-03-13
systems — Local and metropolitan
Voting terminates on:
area networks —
2026-07-31
Part 1AS:
Second edition
Timing and synchronization for
2021-11
time-sensitive applications in
AMENDMENT 2
bridged local area networks
AMENDMENT 2: YANG data model
Technologies de l'information — Télécommunications et
échange d'information entre systèmes — Réseaux locaux et
métropolitains —
Partie 1AS: Temporisation et synchronisation pour les
applications sensibles au temps des réseaux locaux pontés
AMENDEMENT 2
This document is circulated as received from the committee secretariat.
RECIPIENTS OF THIS DRAFT ARE INVITED TO SUBMIT,
WITH THEIR COMMENTS, NOTIFICATION OF ANY
RELEVANT PATENT RIGHTS OF WHICH THEY ARE AWARE
AND TO PROVIDE SUPPORTING D OCUMENTATION.
IN ADDITION TO THEIR EVALUATION AS
© IEEE 2026
BEING ACCEPTABLE FOR INDUSTRIAL, TECHNO­
FAST TRACK PROCEDURE
LOGICAL, COMMERCIAL AND USER PURPOSES, DRAFT
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Reference number
Published in Switzerland ISO/IEC/IEEE 8802­1AS:2021/FDAM
2:2026(en)
© IEEE 2024
© IEEE 2026 – All rights reserved
ii
ISO/IEC/IEEE 8802-1AS:2021/FDAM 2:2026(en)
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© IEEE 2024 – All rights reserved
iii
ISO/IEC/IEEE 8802-1AS:2021/Amd 2:2026(en)
Title page
IEEE Std 802.1ASdn™-2024
(Amendment to IEEE Std 802.1AS™-2020
as amended by IEEE Std 802.1AS™-2020/Cor 1-2021
and IEEE Std 802.1ASdr™-2024)
IEEE Standard for
Local and Metropolitan Area Networks—
Timing and Synchronization for
Time-Sensitive Applications
Amendment 2: YANG Data Model
Developed by the
LAN/MAN Standards Committee
of the
IEEE Computer Society
Approved 26 September 2024
IEEE SA Standards Board
ISO/IEC/IEEE 8802-1AS:2021/Amd 2:2026(en)
Abstract: A YANG data model that allows configuration and state reporting for all managed objects
of the base standard is specified in this amendment.
Keywords: amendment, data model, IEEE 802.1AS™, IEEE 802.1ASdn™, managed objects,
network management, synchronization, syntonization, time-aware system, YANG
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Print: ISBN 979-8-8557-1239-1 STDPD27315
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ISO/IEC/IEEE 8802-1AS:2021/Amd 2:2026(en)
Participants
At the time this standard was submitted to the IEEE SA Standards Board for approval, the IEEE 802.1
Working Group had the following membership:
Glenn Parsons, Chair
Jessy V. Rouyer, Vice Chair
János Farkas, TSN Task Group Chair
Geoffrey Garner, Editor, IEEE Std 802.1AS
Johannes Specht, Editor, IEEE P802.1ASdn
Satoko Itaya
Katsuyuki Akizuki Silvana Rodrigues
Rajeev Roy
Venkat Arunarthi Yoshihiro Ito
Atsushi Sato
Ralf Assmann Michael Karl
Frank Schewe
Rudy Belliardi Stephan Kehrer
Michael Seaman
Christian Boiger Marcel Kiessling
Maik Seewald
Paul Bottorff Gavin Lai
Ramesh Sivakolundu
Radhakrishna Canchi Yunping (Lily) Lyu
Nemanja Stamenic
Feng Chen Christophe Mangin
Marius Stanica
Abhijit Choudhury Scott Mansfield
Guenter Steindl
Anna Engelmann Olaf Mater
Karim Traore
Donald Fedyk David McCall
Max Turner
Norman Finn Martin Mittelberger
Balazs Varga
Craig Gunther Hiroki Nakano
Ganesh Venkatesan
Stephen Haddock Takumi Nomura
Leon Wessels
Mark Hantel Donald R. Pannell
Ludwig Winkel
Marc Holness Dieter Proell
Jordon Woods
Daniel Hopf Karen Randall
Takahiro Yamaura
Woojung Huh Maximilian Riegel
Nader Zein
The following members of the individual balloting committee voted on this standard. Balloters may have
voted for approval, disapproval, or abstention.
Boon Chong Ang Ruslan Karmanov R. K. Rannow
Butch Anton Piotr Karocki Denis Reilly
Stefan Aust Stephan Kehrer Maximilian Riegel
Denis Beaudoin Stuart Kerry Silvana Rodrigues
Christian Boiger Yongbum Kim Benjamin Rolfe
Vern Brethour Jeff Koftinoff Jessy V. Rouyer
William Byrd Gavin Lai Frank Schewe
Radhakrishna Canchi Hyeong Ho Lee Reinhard Schrage
Jon Lewis
Paul Cardinal Jhony Sembiring
Pin Chang Jingfei Lv Johannes Specht
Rodney Cummings Christophe Mangin Walter Struppler
János Farkas Scott Mansfield Eric Thibodeau
Donald Fedyk William-Rogelio Marchand-Niño Max Turner
Geoffrey Garner Jonathon McLendon John Vergis
Stephen Haddock Rajesh Murthy James Weaver
Mark Hantel Satoshi Obara Stephen Webb
Marco Hernandez Glenn Parsons Scott Willy
Werner Hoelzl Bansi Patel Ludwig Winkel
Raj Jain Arumugam Paventhan Andreas Wolf
Pranav Jha Cam Posani Yu Yuan
Lokesh Kabra Dieter Proell Oren Yuen
ISO/IEC/IEEE 8802-1AS:2021/Amd 2:2026(en)
When the IEEE SA Standards Board approved this standard on 26 September 2024, it had the following
membership:
David J. Law, Chair
Jon W. Rosdahl, Vice Chair
Gary Hoffman, Past Chair
Alpesh Shah, Secretary
Sara R. Biyabani Hao Hu Hiroshi Mano
Paul Nikolich
Ted Burse Yousef Kimiagar
Robby Robson
Stephen Dukes Joseph L. Koepfinger*
Lei Wang
Doug Edwards Howard Li
F. Keith Waters
J. Travis Griffith Xiaohui Liu
Sha Wei
Guido R. Hiertz John Haiying Lu
Philip B. Winston
Ronald W. Hotchkiss Kevin W. Lu
Don Wright
*Member Emeritus
ISO/IEC/IEEE 8802-1AS:2021/Amd 2:2026(en)
Introduction
This introduction is not part of IEEE Std 802.1ASdn-2024, IEEE Standard for Local and Metropolitan Area
Networks—Timing and Synchronization for Time-Sensitive Applications—Amendment 2: YANG Data Model.
The first edition of IEEE Std 802.1AS was published in 2011. A first corrigendum, IEEE Std
802.1AS™-2011/Cor 1-2013, provided technical and editorial corrections. A second corrigendum, IEEE St d
802.1AS™-2011/Cor 2-2015 provided additional technical and editorial corrections.
The second edition, IEEE Std 802.1AS-2020, added support for multiple gPTP domains, Common Mean
Link Delay Service, external port configuration, and Fine Timing Measurement for IEEE 802.11 transport.
Backward compatibility with IEEE Std 802.1AS-2011 was maintained. The corrigendum, IEEE
802.1AS-2020/Cor 1-2021, provides technical and editorial corrections. The amendment, IEEE Std
802.1ASdr-2024, changed non-inclusive terms, replacing them with suitable and inclusive terminology
wherever possible.
This amendment to IEEE Std 802.1AS-2020 specifies a YANG data model that allows configuration and
state reporting for all managed objects of the base standard.
ISO/IEC/IEEE 8802-1AS:2021/Amd 2:2026(en)
Contents
2. Normative references. 14
4. Acronyms and abbreviations . 15
5. Conformance. 16
5.4 PTP Instance requirements and options. 16
15. Managed object definitionsManagement Information Base (MIB). 17
17. YANG data model . 18
17.1 YANG framework . 18
17.2 IEEE 802.1AS YANG data model . 19
17.3 Structure of the YANG data model . 23
17.4 Security considerations . 24
17.5 YANG schema tree definitions. 24
17.6 YANG module, . 29
Annex A (normative) Protocol Implementation Conformance Statement (PICS) proforma . 76
A.19 Remote management. 76
Annex F (informative) PTP profile included in this standard . 77
F.4 PTP options. 77
Annex H (informative) Bibliography . 78
ISO/IEC/IEEE 8802-1AS:2021/Amd 2:2026(en)
List of Figures
Figure 17-1—Overview of YANG tree . 20
Figure 17-2—PTP Instance detail. 21
Figure 17-3—PTP Port detail . 22
Figure 17-4—Common services detail . 23
ISO/IEC/IEEE 8802-1AS:2021/Amd 2:2026(en)
List of Tables
Table 17-1 Summary of the YANG modules. 24
ISO/IEC/IEEE 8802-1AS:2021/Amd 2:2026(en)
IEEE Standard for 
Local and Metropolitan Area Networks—
Timing and Synchronization for
Time-Sensitive Applications
Amendment 2: YANG Data Model
(This amendment is based on IEEE Std 802.1AS™-2020 as amended by IEEE Std 802.1AS™-2020/Cor 1-2021
and IEEE Std 802.1 ASdr-2024.)
NOTE—The editing instructions contained in this amendment define how to merge the material contained therein into
the existing base standard and its amendments to form the comprehensive standard.
The editing instructions are shown in bold italic. Four editing instructions are used: change, delete, insert, and replace.
Change is used to make corrections in existing text or tables. The editing instruction specifies the location of the change
and describes what is being changed by using strikethrough (to remove old material) and underscore (to add ne w
material). Delete removes existing material. Insert adds new material without disturbing the existing material. Deletions
and insertions may require renumbering. If so, renumbering instructions are given in the editing instruction. Replace is
used to make changes in figures or equations by removing the existing figure or equation and replacing it with a ne w
one. Editing instructions, change markings, and this NOTE will not be carried over into future editions because the
changes will be incorporated into the base standard.
Notes in text, tables, and figures are given for information only and do not contain requirements needed to implement the standard.
ISO/IEC/IEEE 8802-1AS:2021/Amd 2:2026(en)
IEEE Std 802.1ASdn-2024
IEEE Standard for Local and Metropolitan Area NetworksTiming and Synchronization for Time-Sensitive Applications—
Amendment 2: YANG Data Model
2. Normative references
Insert the following references into Clause 2 in alphanumeric order:
IEEE Std 802d™-2017, IEEE Standard for Local and Metropolitan Area Networks—Overview and ®
Architecture—Amendment 1: Allocation of Uniform Resource Name (URN) Values in IEEE 802
7, 8
Standards.
IEEE Std 1588e™-2024, IEEE Standard for Precision Clock Synchronization Protocol for Networked
Measurement and Control Systems—Amendment 5: MIB and YANG Modules.
IETF RFC 7950, The YANG 1.1 Data Modeling Language, August 2016.
The IEEE standards or products referred to in Clause 2 are trademarks owned by The Institute of Electrical and Electronics Engineers,
Incorporated.
IEEE publications are available from The Institute of Electrical and Electronics Engineers (https://standards.ieee.org/).
IETF RFCs are available from the Internet Engineering Task Force (https://www.ietf.org/).
ISO/IEC/IEEE 8802-1AS:2021/Amd 2:2026(en)
IEEE Std 802.1ASdn-2024
IEEE Standard for Local and Metropolitan Area NetworksTiming and Synchronization for Time-Sensitive Applications—
Amendment 2: YANG Data Model
4. Acronyms and abbreviations
Insert the following abbreviations into Clause 4 in alphanumeric order:
NETCONF Network Configuration Protocol
® 10
UML Unified Modeling Language™
10 ®
UML is a registered trademark of the Object Management Group, Inc., and Unified Modeling Language™ is a trademark of the
Object Management Group, Inc.
ISO/IEC/IEEE 8802-1AS:2021/Amd 2:2026(en)
IEEE Std 802.1ASdn-2024
IEEE Standard for Local and Metropolitan Area NetworksTiming and Synchronization for Time-Sensitive Applications—
Amendment 2: YANG Data Model
5. Conformance
5.4 PTP Instance requirements and options
5.4.2 PTP Instance options
Insert a new list item k) 4) after k) 3) in the list in 5.4.2, as follows:
4) If YANG is supported with a remote management protocol, support the YANG data model in
Clause 17.
ISO/IEC/IEEE 8802-1AS:2021/Amd 2:2026(en)
IEEE Std 802.1ASdn-2024
IEEE Standard for Local and Metropolitan Area NetworksTiming and Synchronization for Time-Sensitive Applications—
Amendment 2: YANG Data Model
Change the title of Clause 15 as follows:
15. Managed object definitionsManagement Information Base (MIB)
ISO/IEC/IEEE 8802-1AS:2021/Amd 2:2026(en)
IEEE Std 802.1ASdn-2024
IEEE Standard for Local and Metropolitan Area NetworksTiming and Synchronization for Time-Sensitive Applications—
Amendment 2: YANG Data Model
Insert new Clause 17 after Clause 16 as follows:
17. YANG data model
YANG (IETF RFC 7950) is a data modeling language used to model configuration data and state data for
remote network management protocols. YANG-based remote network management protocols include the
Network Configuration Protocol (NETCONF) (IETF RFC 6242 [B13a]) and RESTCONF (IETF RFC 8040
[B13e]). Each remote network management protocol uses a specific encoding on the wire, such as XML o r
JSON. A YANG module specifies the organization and rules for the management data, and a mapping from
YANG to the specific encoding enables the data to be understood correctly by both client (e.g., network
manager) and server (e.g., PTP Instances).
This clause specifies the YANG data model for IEEE Std 802.1AS.
This clause:
a) Introduces the organization of the data models, including the relationship with other standards (17.1)
b) Provides an overview of the hierarchy of the data models using a representation similar to the
Unified Modeling Language (UML) (17.2)
c) Summarizes the structure of the YANG data model (17.3)
d) Reviews security considerations (17.4)
e) Provides a schema tree as an overview of the YANG module (17.5)
f) Specifies the YANG module (17.6)
17.1 YANG framework
The YANG framework applies hierarchy in the following areas:
a) The Uniform Resource Name (URN), as specified in IEEE Std 802d-2017.
b) The YANG objects form a hierarchy of configuration and operational data structures that define the
YANG model.
Clause 14 specifies the information model for management of this standard. The data model for a specific
management mechanism is derived from the information model. Since YANG-based protocols are an
example of a management mechanism, the YANG data model of this clause is derived from Clause 14.
NOTE—The MIB modules specified in Clause 15 were also derived from Clause 14. Consequently, the capabilities and
structure of the YANG data models are aligned with those represented by the MIB. However the YANG data model has
not been derived from the MIB, and there has been no attempt to include data or modeling constructs that might appear
in the MIB but not in the information model.
The information model in Clause 14 is organized as a hierarchy of data sets. Each data set contains one or
more related members (items of data that can be read or written). In the context of YANG, each data set is
represented as a YANG “container,” and each member is represented as a YANG “leaf.”
17.1.1 Relationship to the IEEE Std 1588 data model
The YANG data models specified in this standard are based on, and augment, those specified in IEEE
Std 1588. In particular the ieee802-dot1as-gptp.yang module imports the ieee1588-ptp-tt module as a whole,
augmenting that module as necessary to meet the requirements of this standard.
ISO/IEC/IEEE 8802-1AS:2021/Amd 2:2026(en)
IEEE Std 802.1ASdn-2024
IEEE Standard for Local and Metropolitan Area NetworksTiming and Synchronization for Time-Sensitive Applications—
Amendment 2: YANG Data Model
Some of the data sets in Clause 14 (e.g., defaultDS) are derived from IEEE Std 1588, and some of the data
sets are unique to IEEE Std 802.1AS (i.e., not derived from IEEE Std 1588). For each data set in Clause 14
that is derived from IEEE Std 1588, a portion of the members are derived from IEEE Std 1588, and the
remaining members are unique to IEEE Std 802.1AS. For the members that are derived from IEEE Std 1588,
the specifications in both standards are analogous (same name, data type, semantics, etc.).
The YANG data model for IEEE Std 1588-2019 is published as amendment IEEE Std 1588e. The YANG
module of IEEE Std 1588e (ieee1588-ptp-tt.yang) contains the hierarchy (tree) of data sets and their
members.
The YANG module of this clause (ieee802-dot1as-gptp.yang) uses the YANG “import” statement to import
the YANG module of IEEE Std 1588e. This effectively uses the IEEE Std 1588 YANG tree as the foundation
of the IEEE Std 802.1AS YANG tree. By importing the tree and its data set containers, all members from
Clause 14 that are derived from IEEE Std 1588 are also imported.
The core of the YANG module for IEEE Std 802.1AS consists of YANG “augment” statements, used to add
members to the tree that are unique for IEEE Std 802.1AS.
NOTE— IETF RFC 8575 [B13g] is the standard YANG data model for IEEE Std 1588-2008. The YANG data model of
IEEE Std 1588e is effectively a newer version of RFC 8575. Therefore, the YANG module of RFC 8575 is not imported
by the YANG module of this clause.
17.2 IEEE 802.1AS YANG data model
This clause uses a UML-like representation to provide an overview of the hierarchy of the IEEE
Std 802.1AS YANG data model.
A representation of the management model is provided in Figure 17-1 through Figure 17-4. The purpose of
the diagrams is to express the model design in a concise manner. The structure of the representation shows
the name of the object followed by a list of properties for the object. The properties indicate their type and
accessibility. The representation is meant to express simplified semantics for the properties. It is not mean t
to provide the specific datatype used to encode the object in either MIB or YANG. In the representation, a
box with a white background represents information that comes from sources outside of this IEEE standard.
A box with a gray background represents objects that are defined by this IEEE standard.
® 11
NOTE 1—OMG UML 2.5 [B24a] conventions together with C++ language constructs are used in this clause as a
representation to convey model structure and relationships.
NOTE 2—This standard specifies YANG for Clause 14 of this standard. There are optional features in the YANG
module of IEEE Std 1588 that are not specified in Clause 14, and are therefore not shown in the figures of this subclause.
If optional IEEE Std 1588 YANG features are implemented, conformance is specified by IEEE Std 1588.
For all figures, Clause 14 data that is imported from the ieee1588-ptp-tt.yang module is shown in white, and
Clause 14 data in augments of ieee802-dot1as-gptp.yang is shown in gray.
Figure 17-1 provides an overview of the IEEE Std 802.1AS YANG tree. The top level instance list provides
the list of one or more PTP Instances, each with data sets. For each PTP Instance, port-ds-list provides the
list of one or more PTP Ports, each with data sets. The common-services apply to all PTP Instances,
including the Common Mean Link Delay Service (cmlds).
11 ®
OMG is a registered trademark of the Object Management Group, Inc.
ISO/IEC/IEEE 8802-1AS:2021/Amd 2:2026(en)
IEEE Std 802.1ASdn-2024
IEEE Standard for Local and Metropolitan Area NetworksTiming and Synchronization for Time-Sensitive Applications—
Amendment 2: YANG Data Model
ieee802-dot1as-gptp
imports ieee1588-ptp-tt
ptp
instances
instance-index
*
instance
default-ds time-properties-ds
(members shared with 1588) (members shared with 1588)
(members specific to 802.1AS)
current-ds path-trace-ds
(members shared with 1588) (members shared with 1588)
(members specific to 802.1AS)
parent-ds acceptable-time-transmitter-ds
(members shared with 1588) (members shared with 1588)
(members specific to 802.1AS)
ports
port-index
*
port
port-ds external-port-config-port-ds
(members shared with 1588) (members shared with 1588)
(members specific to 802.1AS)
asymmetry-measurement-mode-ds
description-port-ds (members specific to 802.1AS)
(members shared with 1588)
common-services-port
port-statistics-ds (members shared with 1588)
(members specific to 802.1AS)
acceptable-time-transmitter-port-ds
(members shared with 1588)
common-services
cmlds
default-ds
(members shared with 1588)
ports
port-index
*
port
link-port-ds port-statistics-ds asymmetry-measurement-mode-ds
(members shared with 1588) (members specific to 802.1AS) (members specific to 802.1AS)
(members specific to 802.1AS)
Figure 17-1—Overview of YANG tree
ISO/IEC/IEEE 8802-1AS:2021/Amd 2:2026(en)
IEEE Std 802.1ASdn-2024
IEEE Standard for Local and Metropolitan Area NetworksTiming and Synchronization for Time-Sensitive Applications—
Amendment 2: YANG Data Model
Figure 17-2 provides detail for the data sets of each PTP Instance, including each data set member.
instances
instance-index
*
instance
default-ds parent-ds
clock-identity clock-identity; // r struct parent-port-identity; // r
uint16 number-ports; // r clock-identity grandmaster-identity; // r
struct clock-quality; // r-w struct grandmaster-clock-quality; // r
uint8 priority1; // r-w uint8 grandmaster-priority1; // r
uint8 priority2; // r-w uint8 grandmaster-priority2; // r
uint8 domain-number; // r-w
int32 cumulative-rate-ratio; // r
uint16 sdo-id; // r-w
bool instance-enable; // r-w
bool external-port-config-enable; // r-w
t
...