ISO/IEC/IEEE 8802-1Q:2020
(Main)Telecommunications and exchange between information technology systems — Requirements for local and metropolitan area networks — Part 1Q: Bridges and bridged networks
Telecommunications and exchange between information technology systems — Requirements for local and metropolitan area networks — Part 1Q: Bridges and bridged networks
This document specifies Bridges that interconnect individual LANs, each supporting the IEEE 802 MAC Service using a different or identical media access control method, to provide Bridged Networks and VLANs.
Télécommunications et échange entre systèmes informatiques — Exigences pour les réseaux locaux et métropolitains — Partie 1Q: Ponts et réseaux pontés
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INTERNATIONAL ISO/IEC/
STANDARD IEEE
8802-1Q
Second edition
2020-08
Telecommunications and exchange
between information technology
systems — Requirements for local and
metropolitan area networks —
Part 1Q:
Bridges and bridged networks
Télécommunications et échange entre systèmes informatiques —
Exigences pour les réseaux locaux et métropolitains —
Partie 1Q: Ponts et réseaux pontés
Reference number
©
IEEE 2018
© IEEE 2018
All rights reserved. Unless otherwise specified, or required in the context of its implementation, no part of this publication may
be reproduced or utilized otherwise in any form or by any means, electronic or mechanical, including photocopying, or posting
on the internet or an intranet, without prior written permission. Permission can be requested from either ISO or IEEE at
the respective address below or ISO’s member body in the country of the requester.
ISO copyright office Institute of Electrical and Electronics Engineers, Inc
CP 401 • Ch. de Blandonnet 8 3 Park Avenue, New York
CH-1214 Vernier, Geneva NY 10016-5997, USA
Phone: +41 22 749 01 11
Email: copyright@iso.org Email: stds.ipr@ieee.org
Website: www.iso.org Website: www.ieee.org
Published in Switzerland
© IEEE 2018 – All rights reserved
ii
Foreword
ISO (the International Organization for Standardization) and IEC (the International Electrotechnical
Commission) form the specialized system for worldwide standardization. National bodies that are
members of ISO or IEC participate in the development of International Standards through technical
committees established by the respective organization to deal with particular fields of technical activity.
ISO and IEC technical committees collaborate in fields of mutual interest. Other international
organizations, governmental and non-governmental, in liaison with ISO and IEC, also take part in the work.
The procedures used to develop this document and those intended for its further maintenance are
described in the ISO/IEC Directives, Part 1. In particular, the different approval criteria needed for the
different types of ISO documents should be noted (see www.iso.org/directives).
IEEE Standards documents are developed within the IEEE Societies and the Standards Coordinating
Committees of the IEEE Standards Association (IEEE-SA) Standards Board. The IEEE develops its
standards through a consensus development process, approved by the American National Standards
Institute, which brings together volunteers representing varied viewpoints and interests to achieve the
final product. Volunteers are not necessarily members of the Institute and serve without compensation.
While the IEEE administers the process and establishes rules to promote fairness in the consensus
development process, the IEEE does not independently evaluate, test, or verify the accuracy of any of the
information contained in its standards.
Attention is drawn to the possibility that some of the elements of this document may be the subject of
patent rights. ISO and IEC shall not be held responsible for identifying any or all such patent rights. Details
of any patent rights identified during the development of the document will be in the Introduction and/or
on the ISO list of patent declarations received (see www.iso.org/patents) or the IEC list of patent
declarations received (see http://patents.iec.ch).
Any trade name used in this document is information given for the convenience of users and does not
constitute an endorsement.
For an explanation of the voluntary nature of standards, the meaning of ISO specific terms and expressions
related to conformity assessment, as well as information about ISO's adherence to the World Trade
Organization (WTO) principles in the Technical Barriers to Trade (TBT)
see www.iso.org/iso/foreword.html.
ISO/IEC/IEEE 8802-1Q was prepared by the LAN/MAN of the IEEE Computer Society (as IEEE Std 802.1Q-
2018) and drafted in accordance with its editorial rules. It was adopted, under the “fast-track procedure”
defined in the Partner Standards Development Organization cooperation agreement between ISO and
IEEE, by Joint Technical Committee ISO/IEC JTC 1, Information technology, Subcommittee SC 6,
Telecommunications and information exchange between systems.
This second edition cancels and replaces the first edition (ISO/IEC/IEEE 8802-1Q:2016), which has
been technically revised. It also incorporates the Amendments ISO/IEC/IEEE 8802-1Q:2016/
Amd.1:2017, ISO/IEC/IEEE 8802-1Q:2016/Amd.2:2018, ISO/IEC/IEEE 8802-1Q:2016/Amd.3:2017,
ISO/IEC/IEEE 8802-1Q:2016/Amd.4:2017, ISO/IEC/IEEE 8802-1Q:2016/Amd.5:2017, ISO/IEC/IEEE
8802-1Q:2016/Amd.6:2019, ISO/IEC/IEEE 8802-1Q:2016/Amd.7:2019 and the Corrigendum
ISO/IEC/IEEE 8802-1Q:2016/Cor.1:2017.
A list of all parts in the ISO/IEC/IEEE 8802 series can be found on the ISO website.
Any feedback or questions on this document should be directed to the user’s national standards body. A
complete listing of these bodies can be found at www.iso.org/members.html.
© IEEE 2018 - All rights reserved
iii
IEEE Std 802.1Q™-2018
(Revision of
IEEE Std 802.1Q-2014)
IEEE Standard for
Local and Metropolitan Area Networks—
Bridges and Bridged Networks
Sponsor
LAN/MAN Standards Committee
of the
IEEE Computer Society
Approved 7 May 2018
IEEE-SA Standards Board
Abstract: This standard specifies how the Media Access Control (MAC) Service is supported by
Bridged Networks, the principles of operation of those networks, and the operation of MAC Bridge s
and VLAN Bridges, including management, protocols, and algorithms.
Keywords: Bridged Network, IEEE 802.1Q™, LAN, local area network, MAC Bridge, metropolitan
area network, MSTP, Multiple Spanning Tree Protocol, Rapid Spanning Tree Protocol, RSTP, PBN,
Provider Bridged Network, Shortest Path Bridging Protocol, SPB Protocol, Time-Sensitive
Networking, TSN, Virtual Bridged Network, virtual LAN, VLAN Bridge
The Institute of Electrical and Electronics Engineers, Inc.
3 Park Avenue, New York, NY 10016-5997, USA
All rights reserved. Published 6 July 2018. Printed in the United States of America.
IEEE and IEEE 802 are registered trademarks in the U.S. Patent & Trademark Office, owned by The Institute of Electrical and Electronics
Engineers, Incorporated.
PDF: ISBN 978-1-5044-4929-8 STD23139
Print: ISBN 978-1-5044-4930-4 STDPD23139
IEEE prohibits discrimination, harassment and bullying.
For more information, visit https://www.ieee.org/about/corporate/governance/p9-26.html.
No part of this publication may be reproduced in any form, in an electronic retrieval system or otherwise, without the prior written permission
of the publisher.
Copyright © 2018 IEEE. All rights reserved.
Important Notices and Disclaimers Concerning IEEE Standards Documents
IEEE documents are made available for use subject to important notices and legal disclaimers. These notices and
disclaimers, or a reference to this page, appear in all standards and may be found under the heading “Important Notices
and Disclaimers Concerning IEEE Standards Documents.” They can also be obtained on request from IEEE or viewed at
https://standards.ieee.org/IPR/disclaimers.html.
Notice and Disclaimer of Liability Concerning the Use of IEEE Standards
Documents
IEEE Standards documents (standards, recommended practices, and guides), both full-use and trial-use, are developed
within IEEE Societies and the Standards Coordinating Committees of the IEEE Standards Association (“IEEE-SA”)
Standards Board. IEEE (“the Institute”) develops its standards through a consensus development process, approved by
the American National Standards Institute (“ANSI”), which brings together volunteers representing varied viewpoints
and interests to achieve the final product. IEEE Standards are documents developed through scientific, academic, and
industry-based technical working groups. Volunteers in IEEE working groups are not necessarily members of the
Institute and participate without compensation from IEEE. While IEEE administers the process and establishes rules to
promote fairness in the consensus development process, IEEE does not independently evaluate, test, or verify the
accuracy of any of the information or the soundness of any judgments contained in its standards.
IEEE Standards do not guarantee or ensure safety, security, health, or environmental protection, or ensure against
interference with or from other devices or networks. Implementers and users of IEEE Standards documents are
responsible for determining and complying with all appropriate safety, security, environmental, health, and interference
protection practices and all applicable laws and regulations.
IEEE does not warrant or represent the accuracy or content of the material contained in its standards, and expressly
disclaims all warranties (express, implied and statutory) not included in this or any other document relating to the
standard, including, but not limited to, the warranties of: merchantability; fitness for a particular purpose; non-
infringement; and quality, accuracy, effectiveness, currency, or completeness of material. In addition, IEEE disclaim s
any and all conditions relating to: results; and workmanlike effort. IEEE standards documents are supplied “AS IS” and
“WITH ALL FAULTS.”
Use of an IEEE standard is wholly voluntary. The existence of an IEEE standard does not imply that there are no other
ways to produce, test, measure, purchase, market, or provide other goods and services related to the scope of the IEEE
standard. Furthermore, the viewpoint expressed at the time a standard is approved and issued is subject to change
brought about through developments in the state of the art and comments received from users of the standard.
In publishing and making its standards available, IEEE is not suggesting or rendering professional or other services for,
or on behalf of, any person or entity nor is IEEE undertaking to perform any duty owed by any other person or entity to
another. Any person utilizing any IEEE Standards document, should rely upon his or her own independent judgment in
the exercise of reasonable care in any given circumstances or, as appropriate, seek the advice of a competent
professional in determining the appropriateness of a given IEEE standard.
IN NO EVENT SHALL IEEE BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO: PROCUREMENT O F
SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE
PUBLICATION, USE OF, OR RELIANCE UPON ANY STANDARD, EVEN IF ADVISED OF THE POSSIBILITY
OF SUCH DAMAGE AND REGARDLESS OF WHETHER SUCH DAMAGE WAS FORESEEABLE.
Translations
The IEEE consensus development process involves the review of documents in English only. In the event that an IEEE
standard is translated, only the English version published by IEEE should be considered the approved IEEE standard.
Official statements
A statement, written or oral, that is not processed in accordance with the IEEE-SA Standards Board Operations Manual
shall not be considered or inferred to be the official position of IEEE or any of its committees and shall not be considere d
to be, or be relied upon as, a formal position of IEEE. At lectures, symposia, seminars, or educational courses, a n
individual presenting information on IEEE standards shall make it clear that his or her views should be considered the
personal views of that individual rather than the formal position of IEEE.
Comments on standards
Comments for revision of IEEE Standards documents are welcome from any interested party, regardless of membership
affiliation with IEEE. However, IEEE does not provide consulting information or advice pertaining to IEEE Standards
documents. Suggestions for changes in documents should be in the form of a proposed change of text, together with
appropriate supporting comments. Since IEEE standards represent a consensus of concerned interests, it is important that
any responses to comments and questions also receive the concurrence of a balance of interests. For this reason, IEEE
and the members of its societies and Standards Coordinating Committees are not able to provide an instant response to
comments or questions except in those cases where the matter has previously been addressed. For the same reason, IEE E
does not respond to interpretation requests. Any person who would like to participate in revisions to an IEEE standard is
welcome to join the relevant IEEE working group.
Comments on standards should be submitted to the following address:
Secretary, IEEE-SA Standards Board
445 Hoes Lane
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publication of its standards, intend to urge action that is not in compliance with applicable laws, and these documents
may not be construed as doing so.
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available by IEEE and are adopted for a wide variety of both public and private uses. These include both use, b y
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of any individual standard for company or organizational internal use or individual, non-commercial use only. T o
arrange for payment of licensing fees, please contact Copyright Clearance Center, Customer Se
...
INTERNATIONAL ISO/IEC/
STANDARD IEEE
8802-1Q
Second edition
2020-08
Telecommunications and exchange
between information technology
systems — Requirements for local and
metropolitan area networks —
Part 1Q:
Bridges and bridged networks
Télécommunications et échange entre systèmes informatiques —
Exigences pour les réseaux locaux et métropolitains —
Partie 1Q: Ponts et réseaux pontés
Reference number
©
IEEE 2018
© IEEE 2018
All rights reserved. Unless otherwise specified, or required in the context of its implementation, no part of this publication may
be reproduced or utilized otherwise in any form or by any means, electronic or mechanical, including photocopying, or posting
on the internet or an intranet, without prior written permission. Permission can be requested from either ISO or IEEE at
the respective address below or ISO’s member body in the country of the requester.
ISO copyright office Institute of Electrical and Electronics Engineers, Inc
CP 401 • Ch. de Blandonnet 8 3 Park Avenue, New York
CH-1214 Vernier, Geneva NY 10016-5997, USA
Phone: +41 22 749 01 11
Email: copyright@iso.org Email: stds.ipr@ieee.org
Website: www.iso.org Website: www.ieee.org
Published in Switzerland
© IEEE 2018 – All rights reserved
ii
Foreword
ISO (the International Organization for Standardization) and IEC (the International Electrotechnical
Commission) form the specialized system for worldwide standardization. National bodies that are
members of ISO or IEC participate in the development of International Standards through technical
committees established by the respective organization to deal with particular fields of technical activity.
ISO and IEC technical committees collaborate in fields of mutual interest. Other international
organizations, governmental and non-governmental, in liaison with ISO and IEC, also take part in the work.
The procedures used to develop this document and those intended for its further maintenance are
described in the ISO/IEC Directives, Part 1. In particular, the different approval criteria needed for the
different types of ISO documents should be noted (see www.iso.org/directives).
IEEE Standards documents are developed within the IEEE Societies and the Standards Coordinating
Committees of the IEEE Standards Association (IEEE-SA) Standards Board. The IEEE develops its
standards through a consensus development process, approved by the American National Standards
Institute, which brings together volunteers representing varied viewpoints and interests to achieve the
final product. Volunteers are not necessarily members of the Institute and serve without compensation.
While the IEEE administers the process and establishes rules to promote fairness in the consensus
development process, the IEEE does not independently evaluate, test, or verify the accuracy of any of the
information contained in its standards.
Attention is drawn to the possibility that some of the elements of this document may be the subject of
patent rights. ISO and IEC shall not be held responsible for identifying any or all such patent rights. Details
of any patent rights identified during the development of the document will be in the Introduction and/or
on the ISO list of patent declarations received (see www.iso.org/patents) or the IEC list of patent
declarations received (see http://patents.iec.ch).
Any trade name used in this document is information given for the convenience of users and does not
constitute an endorsement.
For an explanation of the voluntary nature of standards, the meaning of ISO specific terms and expressions
related to conformity assessment, as well as information about ISO's adherence to the World Trade
Organization (WTO) principles in the Technical Barriers to Trade (TBT)
see www.iso.org/iso/foreword.html.
ISO/IEC/IEEE 8802-1Q was prepared by the LAN/MAN of the IEEE Computer Society (as IEEE Std 802.1Q-
2018) and drafted in accordance with its editorial rules. It was adopted, under the “fast-track procedure”
defined in the Partner Standards Development Organization cooperation agreement between ISO and
IEEE, by Joint Technical Committee ISO/IEC JTC 1, Information technology, Subcommittee SC 6,
Telecommunications and information exchange between systems.
This second edition cancels and replaces the first edition (ISO/IEC/IEEE 8802-1Q:2016), which has
been technically revised. It also incorporates the Amendments ISO/IEC/IEEE 8802-1Q:2016/
Amd.1:2017, ISO/IEC/IEEE 8802-1Q:2016/Amd.2:2018, ISO/IEC/IEEE 8802-1Q:2016/Amd.3:2017,
ISO/IEC/IEEE 8802-1Q:2016/Amd.4:2017, ISO/IEC/IEEE 8802-1Q:2016/Amd.5:2017, ISO/IEC/IEEE
8802-1Q:2016/Amd.6:2019, ISO/IEC/IEEE 8802-1Q:2016/Amd.7:2019 and the Corrigendum
ISO/IEC/IEEE 8802-1Q:2016/Cor.1:2017.
A list of all parts in the ISO/IEC/IEEE 8802 series can be found on the ISO website.
Any feedback or questions on this document should be directed to the user’s national standards body. A
complete listing of these bodies can be found at www.iso.org/members.html.
© IEEE 2018 - All rights reserved
iii
IEEE Std 802.1Q™-2018
(Revision of
IEEE Std 802.1Q-2014)
IEEE Standard for
Local and Metropolitan Area Networks—
Bridges and Bridged Networks
Sponsor
LAN/MAN Standards Committee
of the
IEEE Computer Society
Approved 7 May 2018
IEEE-SA Standards Board
Abstract: This standard specifies how the Media Access Control (MAC) Service is supported by
Bridged Networks, the principles of operation of those networks, and the operation of MAC Bridge s
and VLAN Bridges, including management, protocols, and algorithms.
Keywords: Bridged Network, IEEE 802.1Q™, LAN, local area network, MAC Bridge, metropolitan
area network, MSTP, Multiple Spanning Tree Protocol, Rapid Spanning Tree Protocol, RSTP, PBN,
Provider Bridged Network, Shortest Path Bridging Protocol, SPB Protocol, Time-Sensitive
Networking, TSN, Virtual Bridged Network, virtual LAN, VLAN Bridge
The Institute of Electrical and Electronics Engineers, Inc.
3 Park Avenue, New York, NY 10016-5997, USA
All rights reserved. Published 6 July 2018. Printed in the United States of America.
IEEE and IEEE 802 are registered trademarks in the U.S. Patent & Trademark Office, owned by The Institute of Electrical and Electronics
Engineers, Incorporated.
PDF: ISBN 978-1-5044-4929-8 STD23139
Print: ISBN 978-1-5044-4930-4 STDPD23139
IEEE prohibits discrimination, harassment and bullying.
For more information, visit https://www.ieee.org/about/corporate/governance/p9-26.html.
No part of this publication may be reproduced in any form, in an electronic retrieval system or otherwise, without the prior written permission
of the publisher.
Copyright © 2018 IEEE. All rights reserved.
Important Notices and Disclaimers Concerning IEEE Standards Documents
IEEE documents are made available for use subject to important notices and legal disclaimers. These notices and
disclaimers, or a reference to this page, appear in all standards and may be found under the heading “Important Notices
and Disclaimers Concerning IEEE Standards Documents.” They can also be obtained on request from IEEE or viewed at
https://standards.ieee.org/IPR/disclaimers.html.
Notice and Disclaimer of Liability Concerning the Use of IEEE Standards
Documents
IEEE Standards documents (standards, recommended practices, and guides), both full-use and trial-use, are developed
within IEEE Societies and the Standards Coordinating Committees of the IEEE Standards Association (“IEEE-SA”)
Standards Board. IEEE (“the Institute”) develops its standards through a consensus development process, approved by
the American National Standards Institute (“ANSI”), which brings together volunteers representing varied viewpoints
and interests to achieve the final product. IEEE Standards are documents developed through scientific, academic, and
industry-based technical working groups. Volunteers in IEEE working groups are not necessarily members of the
Institute and participate without compensation from IEEE. While IEEE administers the process and establishes rules to
promote fairness in the consensus development process, IEEE does not independently evaluate, test, or verify the
accuracy of any of the information or the soundness of any judgments contained in its standards.
IEEE Standards do not guarantee or ensure safety, security, health, or environmental protection, or ensure against
interference with or from other devices or networks. Implementers and users of IEEE Standards documents are
responsible for determining and complying with all appropriate safety, security, environmental, health, and interference
protection practices and all applicable laws and regulations.
IEEE does not warrant or represent the accuracy or content of the material contained in its standards, and expressly
disclaims all warranties (express, implied and statutory) not included in this or any other document relating to the
standard, including, but not limited to, the warranties of: merchantability; fitness for a particular purpose; non-
infringement; and quality, accuracy, effectiveness, currency, or completeness of material. In addition, IEEE disclaim s
any and all conditions relating to: results; and workmanlike effort. IEEE standards documents are supplied “AS IS” and
“WITH ALL FAULTS.”
Use of an IEEE standard is wholly voluntary. The existence of an IEEE standard does not imply that there are no other
ways to produce, test, measure, purchase, market, or provide other goods and services related to the scope of the IEEE
standard. Furthermore, the viewpoint expressed at the time a standard is approved and issued is subject to change
brought about through developments in the state of the art and comments received from users of the standard.
In publishing and making its standards available, IEEE is not suggesting or rendering professional or other services for,
or on behalf of, any person or entity nor is IEEE undertaking to perform any duty owed by any other person or entity to
another. Any person utilizing any IEEE Standards document, should rely upon his or her own independent judgment in
the exercise of reasonable care in any given circumstances or, as appropriate, seek the advice of a competent
professional in determining the appropriateness of a given IEEE standard.
IN NO EVENT SHALL IEEE BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO: PROCUREMENT O F
SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE
PUBLICATION, USE OF, OR RELIANCE UPON ANY STANDARD, EVEN IF ADVISED OF THE POSSIBILITY
OF SUCH DAMAGE AND REGARDLESS OF WHETHER SUCH DAMAGE WAS FORESEEABLE.
Translations
The IEEE consensus development process involves the review of documents in English only. In the event that an IEEE
standard is translated, only the English version published by IEEE should be considered the approved IEEE standard.
Official statements
A statement, written or oral, that is not processed in accordance with the IEEE-SA Standards Board Operations Manual
shall not be considered or inferred to be the official position of IEEE or any of its committees and shall not be considere d
to be, or be relied upon as, a formal position of IEEE. At lectures, symposia, seminars, or educational courses, a n
individual presenting information on IEEE standards shall make it clear that his or her views should be considered the
personal views of that individual rather than the formal position of IEEE.
Comments on standards
Comments for revision of IEEE Standards documents are welcome from any interested party, regardless of membership
affiliation with IEEE. However, IEEE does not provide consulting information or advice pertaining to IEEE Standards
documents. Suggestions for changes in documents should be in the form of a proposed change of text, together with
appropriate supporting comments. Since IEEE standards represent a consensus of concerned interests, it is important that
any responses to comments and questions also receive the concurrence of a balance of interests. For this reason, IEEE
and the members of its societies and Standards Coordinating Committees are not able to provide an instant response to
comments or questions except in those cases where the matter has previously been addressed. For the same reason, IEE E
does not respond to interpretation requests. Any person who would like to participate in revisions to an IEEE standard is
welcome to join the relevant IEEE working group.
Comments on standards should be submitted to the following address:
Secretary, IEEE-SA Standards Board
445 Hoes Lane
Piscataway, NJ 08854 USA
Laws and regulations
Users of IEEE Standards documents should consult all applicable laws and regulations. Compliance with the provisions
of any IEEE Standards document does not imply compliance to any applicable regulatory requirements. Implementers of
the standard are responsible for observing or referring to the applicable regulatory requirements. IEEE does not, by the
publication of its standards, intend to urge action that is not in compliance with applicable laws, and these documents
may not be construed as doing so.
Copyrights
IEEE draft and approved standards are copyrighted by IEEE under U.S. and international copyright laws. They are made
available by IEEE and are adopted for a wide variety of both public and private uses. These include both use, b y
reference, in laws and regulations, and use in private self-regulation, standardization, and the promotion of engineering
practices and methods. By making these documents available for use and adoption by public authorities and private
users, IEEE does not waive any rights in copyright to the documents.
Photocopies
Subject to payment of the appropriate fee, IEEE will grant users a limited, non-exclusive license to photocopy portions
of any individual standard for company or organizational internal use or individual, non-commercial use only. T o
arrange for payment of licensing fees, please contact Copyright Clearance Center, Customer Se
...
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