ISO/IEC/IEEE 8802-1AB:2014

Information technology - Telecommunications and information exchange between systems - Local and metropolitan area networks - Part 1AB: Station and media access control connectivity discovery

ISO/IEC/IEEE 8802-1AB:2014 defines a protocol and a set of managed objects that can be used for discovering the physical topology from adjacent stations in ISO/IEC/IEEE 8802 local area networks.

Technologies de l'information — Télécommunications et échange d'information entre systèmes — Réseaux locaux et métropolitains — Partie 1AB: Découverte de connectivité des stations et du contrôle d'accès aux supports

General Information

• Status: Withdrawn
• Publication Date: 06-Feb-2014
• Withdrawal Date: 06-Feb-2014
• ICS: 35.110 - Networking
• Technical Committee: ISO/IEC JTC 1/SC 6 - Telecommunications and information exchange between systems
• Drafting Committee: ISO/IEC JTC 1/SC 6 - Telecommunications and information exchange between systems
• Current Stage: 9599 - Withdrawal of International Standard
• Start Date: 07-Aug-2017
• Completion Date: 30-Oct-2025

Relations

• Revised: ISO/IEC/IEEE 8802-1AB:2017 - Information technology - Telecommunications and information exchange between systems - Local and metropolitan area networks - Specific requirements - Part 1AB: Station and media access control connectivity discovery
• Effective Date: 23-Jul-2016

Standards Content (Sample)

INTERNATIONAL ISO/IEC/
STANDARD IEEE
8802-1AB
First edition
2014-02-15
Information technology —
Telecommunications and information
exchange between systems — Local and
metropolitan area networks —
Part 1AB:
Station and Media Access Control
Connectivity Discovery
Technologies de l'information — Télécommunications et échange
d'information entre systèmes — Réseaux locaux et métropolitains —
Partie 1AB: Découverte de connectivité des stations et du contrôle
d'accès aux supports
Reference number
©
IEEE 2009
©  IEEE 2009
All rights reserved. Unless otherwise specified, 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 permission in writing from ISO,
IEC or IEEE at the respective address below.
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ii © IEEE 2009 – All rights reserved

Foreword
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Association.
ISO/IEC/IEEE 8802-1AB was prepared by the LAN/MAN Standards Committee of the IEEE Computer Society
(as IEEE Std 802.1AB-2009). It was adopted by Joint Technical Committee ISO/IEC JTC 1, Information
technology, Subcommittee SC 6, Telecommunications and information exchange between systems, in parallel
with its approval by the ISO/IEC national bodies, under the “fast-track procedure” defined in the Partner
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the maintenance of this document with participation and input from ISO/IEC national bodies.
ISO/IEC/IEEE 8802 consists of the following parts, under the general title Information technology —
Telecommunications and information exchange between systems — Local and metropolitan area networks:
— Part 11: Wireless LAN medium access control (MAC) and physical layer (PHY) specifications
— Part 1X: Port-based network access control
— Part 1AB: Station and media access control connectivity discovery
— Part 1AE: Media access control (MAC) security
— Part 1AR: Secure device identity
— Part 1AS: Timing and synchronization for time-sensitive applications in bridged local area networks
© IEEE 2009 – All rights reserved iii

— Part 15-4: Wireless medium access control (MAC) and physical layer (PHY) specifications for low-rate
wireless personal area networks (WPANs)

iv © IEEE 2009 – All rights reserved

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™
IEEE Std 802.1AB -2009
(Revision of
IEEE Std 802.1AB-2005)
IEEE Standard for
Local and metropolitan area networks—
Station and Media Access Control
Connectivity Discovery
Sponsor
LAN/MAN Standards Committee
of the
IEEE Computer Society
Approved 11 September 2009
IEEE-SA Standards Board
© IEEE 2009 – All rights reserved Yii

Abstract: This document defines a protocol and a set of managed objects that can be used for ®
discovering the physical topology from adjacent stations in IEEE 802 LANs.
Keywords: link layer discovery protocol, management information base, topology discovery,
topology information
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viii Copyright © 2009 IEEE. All rights reserved.

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Introduction
This introduction is not part of IEEE Std 802.1AB-2009, IEEE Standard for Local and Metropolitan Area
Networks—Station and Media Access Control Connectivity Discovery.
Notice to users
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x Copyright © 2009 IEEE. All rights reserved.

Patents
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Contents
1. Overview. 1
1.1 Scope. 1
1.2 Purpose. 2
2. Normative references. 3
3. Definitions and numerical representation . 5
3.1 Definitions . 5
3.2 Numerical representation. 6
4. Acronyms and abbreviations . 7
5. Conformance. 9
5.1 Terminology. 9
5.2 Protocol Implementation Conformance Statement (PICS). 9
5.3 Required capabilities. 9
5.4 Optional capabilities . 10
6. Principles of operation . 11
6.1 Transmission and reception .12
6.2 LLDP operational modes .12
6.3 LLDP information categories . 13
6.4 TLV selection . 14
6.5 Transmission principles . 14
6.6 Reception principles . 14
6.7 Systems with multiple LLDP Agents . 15
7. LLDPDU transmission, reception, and addressing. 19
7.1 Destination address . 19
7.2 Source address . 21
7.3 Ethertype use and encoding .22
7.4 LLDPDU reception. 22
8. LLDPDU and TLV formats. 23
8.1 LLDPDU bit and octet ordering conventions . 23
8.2 LLDPDU format . 23
8.3 TLV categories . 24
8.4 Basic TLV format . 24
8.5 Basic management TLV set formats and definitions. 26
8.6 Organizationally Specific TLVs . 34
9. LLDP agent operation. 37
9.1 Overview. 37
9.2 State machines . 40
10. LLDP management . 57
10.1 Data storage and retrieval . 57
10.2 The LLDP management entity’s responsibilities. 57
xii Copyright © 2009 IEEE. All rights reserved.

10.3 Managed objects . 59
10.4 Data types . 59
10.5 LLDP variables . 59
11. LLDP MIB definitions. 62
11.1 Internet Standard Management Framework . 62
11.2 Structure of the LLDP MIB .62
11.3 Relationship to other MIBs. 67
11.4 Security considerations for LLDP base MIB module. 68
11.5 LLDP MIB modules , . 70
Annex A (normative) PICS proforma.115
A.1 Introduction. 115
A.2 Abbreviations and special symbols. 115
A.3 Instructions for completing the PICS proforma. 116
A.4 Major capabilities and options. 119
Annex B (normative) PTOPO MIB update . 121
Annex C (informative) Example LLDP transmission frame formats. 122
C.1 Direct-encoded LLDP frame format. 122
C.2 SNAP-encoded LLDP frame format. 122
Annex D (informative) Using LLDP to detect potential communication problems. 123
D.1 Overview. 123
D.2 IEEE 802.1 Organizationally Specific TLVs . 123
D.3 IEEE 802.3 Organizationally Specific TLVs . 125
Annex E (normative) IEEE 802.1 Organizationally Specific TLVs. 127
E.1 Requirements of the IEEE 802.1 Organizationally Specific TLV set . 127
E.2 Port VLAN ID TLV.127
E.3 Port And Protocol VLAN ID TLV . 128
E.4 VLAN Name TLV . 129
E.5 Protocol Identity TLV. 130
E.6 VID Usage Digest TLV . 131
E.7 Management VID TLV. 131
E.8 Link Aggregation TLV . 132
E.9 IEEE 802.1 Organizationally Specific TLV management. 132
E.10 IEEE 802.1/LLDP extension MIB. 133
E.11 PICS proforma for IEEE 802.1 Organizationally Specific TLV extensions . 163
Annex F (normative) IEEE 802.3 Organizationally Specific TLVs. 165
F.1 Requirements of the IEEE 802.3 Organizationally Specific TLV set . 165
F.2 MAC/PHY Configuration/Status TLV . 165
F.3 Power Via MDI TLV. 167
F.4 Maximum Frame Size TLV. 168
F.5 IEEE 802.3 Organizationally Specific TLV selection management . 168
F.6 IEEE 802.3/LLDP extension MIB. 169
F.7 PICS proforma for IEEE 802.3 TLV extensions . 187
Annex G (informative) Bibliography . 189
Annex H (informative) IEEE list of participants . 191
List of figures
Figure 6-1 LLDP agent and its relationship to its LLC entity . 11
Figure 6-2 Relationship between LLDP agents, LLC Entities, MSAPs, and the LLDP
management entity . 15
Figure 6-3 LLDP in a MAC Bridge. 16
Figure 6-4 LLDP in an end system with port-based network access control . 16
Figure 6-5 LLDP in a MAC Bridge that uses port-based network access control on both ports . 17
Figure 6-6 Scope of group MAC addresses. 17
Figure 6-7 Multiplexing and demultiplexing using shims. 18
Figure 7-1 MSDU format . 19
Figure 8-1 LLDPDU Format . 23
Figure 8-2 Basic TLV format . 24
Figure 8-3 End Of LLDPDU TLV format. 26
Figure 8-4 Chassis ID TLV Format. 26
Figure 8-5 Port ID TLV format . 28
Figure 8-6 Time To Live TLV format . 29
Figure 8-7 Port Description TLV format. 29
Figure 8-8 System Name TLV format. 30
Figure 8-9 System Description TLV format. 31
Figure 8-10 System Capabilities TLV format . 31
Figure 8-11 Management Address TLV format . 33
Figure 8-12 Basic format for Organizationally Specific TLVs . 35
Figure 9-1 Transmit state machine . 54
Figure 9-2 Receive state machine. 55
Figure 9-3 Transmit timer state machine. 56
Figure 11-1 LLDP MIB block diagram . 62
Figure C.1 IEEE 802.3 LLDP frame format. 122
Figure C.2 IEEE 802.11 LLDP frame format . 122
Figure E.1 Port VLAN ID TLV Format . 128
Figure E.2 Port And Protocol VLAN ID TLV Format. 128
Figure E.3 VLAN Name TLV format. 129
Figure E.4 Protocol Identity TLV format . 130
Figure E.5 VID Usage Digest TLV format. 131
Figure E.6 Management VID TLV format . 131
Figure E.7 Link Aggregation TLV format. 132
Figure F.1 MAC/PHY configuration/status TLV format . 166
Figure F.2 Power Via MDI TLV format . 167
Figure F.3 Maximum Frame Size TLV format . 168
xiv Copyright © 2009 IEEE. All rights reserved.

List of tables
Table 7-1 Group MAC addresses used by LLDP . 20
Table 7-2 Support for MAC addresses in different systems . 21
Table 7-3 LLDP Ethertype. 22
Table 8-1 TLV type values. 25
Table 8-2 Chassis ID subtype enumeration. 27
Table 8-3 Port ID subtype enumeration . 28
Table 8-4 System capabilities . 32
Table 9-5 Subclause/operating mode applicability . 37
Table 9-6 State machine symbols. 42
Table 11-1 MIB object groups and operating mode applicability . 63
Table 11-2 LLDP MIB structure and object cross reference . 63
Table E.1 IEEE 802.1 Organizationally Specific TLVs . 127
Table E.2 Port and protocol capability/status. 129
Table E.3 Link aggregation capability/status . 132
Table E.4 IEEE 802.1 extension MIB object group conformance requirements . 134
Table E.5 IEEE 802.1/LLDP extension MIB object cross reference. 135
Table F.1 IEEE 802.3 Organizationally Specific TLVs . 165
Table F.2 IEEE 802.3 auto-negotiation support/status . 166
Table F.3 MDI power capabilities/status . 167
Table F.4 IEEE 802.1 extension MIB object group conformance requirements . 170
Table F.5 IEEE 802.3/LLDP extension MIB cross reference. 170
IEEE Standard for
Local and metropolitan area networks—
Station and Media Access Control
Connectivity Discovery
IMPORTANT NOTICE: This standard is not intended to ensure safety, security, health, or
environmental protection in all circumstances. Implementers of the standard are responsible for
determining appropriate safety, security, environmental, and health practices or regulatory requirements.
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1. Overview
The Link Layer Discovery Protocol (LLDP) specified in this standard allows stations attached to an IEEE ®
802 LAN to advertise, to other stations attached to the same IEEE 802 LAN, the major capabilities
provided by the system incorporating that station, the management address or addresses of the entity or
entities that provide management of those capabilities, and the identification of the station’s point of
attachment to the IEEE 802 LAN required by those management entity or entities.
The information distributed via this protocol is stored by its recipients in a standard Management
Information Base (MIB), making it possible for the information to be accessed by a Network Management
System (NMS) using a management protocol such as the Simple Network Management Protocol (SNMP).
1.1 Scope
The scope of this standard is to define a protocol and management elements, suitable for advertising
information to stations attached to the same IEEE 802 LAN, for the purpose of populating physical topology
and device discovery management information databases. The protocol facilitates the identification of
IEEE IEEE STANDARD FOR LOCAL AND METROPOLITAN AREA NETWORKS
Std 802.1AB-2009
stations connected by IEEE 802 LANs/MANs, their points of interconnection, and access points for
management protocols.
This standard defines a protocol that
a) Advertises connectivity and management information about the local station to adjacent stations on
the same IEEE 802 LAN.
b) Receives network management information from adjacent stations on the same IEEE 802 LAN.
c) Operates with all IEEE 802 access protocols and network media.
d) Establishes a network management information schema and object definitions that are suitable for
storing connection information about adjacent stations.
e) Provides compatibility with the IETF PTOPO MIB (IETF RFC 2922 [B14]).
1.2 Purpose
An IETF MIB (IETF RFC 2922 [B14]), as well as a number of vendor specific MIBs, have been created to
describe a network’s physical topology and associated systems within that topology.
This standard specifies the necessary protocol and management elements to
a) Facilitate multi-vendor inter-operability and the use of standard management tools to discover and
make available physical topology information for network management.
b) Make it possible for network management to discover certain configuration inconsistencies or
malfunctions that can result in impaired communication at higher layers.
c) Provide information to assist network management in making resource changes and/or re-
configurations that correct configuration inconsistencies or malfunctions identified in b) above.
The numbers in brackets correspond to those in the bibliography in Annex G.
2 Copyright © 2009 IEEE. All rights reserved.

STATION AND MEDIA ACCESS CONTROL CONNECTIVITY DISCOVERY IEEE
Std 802.1AB-2009
2. Normative references
The following referenced documents are indispensable for the application of this document (i.e., they must
be understood and used, so each referenced document is cited in the text and its relationship to this
document is explained). For dated references, only the edition cited applies. For undated references, the
latest edition of the referenced document (including any amendments or corrigenda) applies.
® 2, 3
IEEE Std 802 , IEEE Standard for Local and Metropolitan Area Networks: Overview and Architecture.
™
IEEE Std 802a , IEEE Standard for Local and Metropolitan Area Networks: Overview and
Architecture—Amendment 1: Ethertypes for Prototype and Vendor-Specific Protocol Development.
™
IEEE Std 802.1AE , IEEE Standard for Local and Metropolitan Area Networks—Media Access Control
(MAC) Security.
™
IEEE Std 802.1AX , IEEE Standard for Local and Metropolitan Area Networks—Link Aggregation.
™
IEEE Std 802.1D , IEEE Standard for Local and Metropolitan Area Networks: Media Access Control
(MAC) Bridges.
™
IEEE Std 802.1Q , IEEE Standards for Local and Metropolitan Area Networks: Virtual Bridged Local Area
Networks.
™
IEEE Std 802.1X , IEEE Standard for Local and Metropolitan Area Networks—Port-Based Network
Access Control.
™
IEEE Std 802.3 , IEEE Standard for Information technology—Telecommunications and information
exchange between systems—Local and metropolitan area networks—Specific requirements—Part 3: Carrier
Sense Multiple Access with Collision Detection (CSMA/CD) Access Method and Physical Layer
Specifications.
IETF RFC 1812, Requirements for IP Version 4 Routers, Baker, F., June 1995.
IETF RFC 2108, Definitions of Managed Objects for IEEE 802.3 Repeater Devices using SMIv2, de Graaf,
K., and Romascanu, D., February 1997.
IETF RFC 2863, The Interfaces Group MIB, McCloghrie, K. and Kastenholz, F., June 2000.
IETF RFC 3046, DHCP Relay Agent Information Option, Patrick, M., January 2001.
IETF RFC 3232, Assigned Numbers: RFC 1700 is Replaced by an On-line Database, Reynolds, J., January
2002.
IETF RFC 3410, Introduction and Applicability Statements for Internet Standard Management Framework,
Case, J., Mundy, R.,Partain, D., and Stewart, B., December 2002.
IEEE and 802 are registered trademarks in the U.S. Patent & Trademark Office, owned by the Institute of Electrical and Electronics
Engineers, Incorporated.
IEEE publications are available from the Institute of Electrical and Electronics Engineers, 445 Hoes Lane, Piscataway, NJ 08855, USA
(http://standards.ieee.org).
Internet RFCs are retrievable by FTP at ftp://ftp.rfc-editor.org/in-notes/rfcnnnn.txt, or by Web browser at http://www.rfc-editor.org/
rfcNNNN.txt (where NNNN is the RFC number prefixed with zeroes as necessary to make a four digit number). If the RFC number is
not known, there is a search facility at http://www.rfc-editor.org/.
The IETF RFC 3232 ianaAddressFamilyNumbers on-line database module is accessible through a web page (currently, http://
www.iana.org).
IEEE IEEE STANDARD FOR LOCAL AND METROPOLITAN AREA NETWORKS
Std 802.1AB-2009
IETF RFC 3417, Transport Mappings for the Simple Network Management Protocol (SNMP), Presuhn, R.,
Case, J., McCloghrie, K., Rose, M., Waldbusser, S., December 2002.
IETF RFC 3418, Management Information Base (MIB) for the Simple Network Management Protocol
(SNMP), Presuhn, R., ED., December 2002.
IETF RFC 3621, Power Ethernet MIB, Berger, A. and Romascanu, D., December 2003.
IETF RFC 3629, UTF-8, a transformation format of ISO 10646, Yergeau, F. November 2003.
IETF RFC 4133, Entity MIB (Version 3), A. Bierman, K. McCloghrie, August 2005.
IETF RFC 4293, Management Information Base for the Internet Protocol (IP), S. Routhier, Ed., April 2006.
IETF RFC 4363, Definitions of Managed Objects for Bridges with Traffic Classes, Multicast Filtering, and
Virtual LAN Extensions, D. Levi, D. Harrington, January 2006.
IETF RFC 4502, Remote Network Monitoring Management Information Base Version 2, Waldbusser, S.,
May 2006.
IETF RFC 4546, Radio Frequency (RF) Interface Management Information Base for Data over Cable
Service Interface Specifications (DOCSIS)
...