EN 62439-2:2017

SLOVENSKI STANDARD
01-februar-2018
1DGRPHãþD
SIST EN 62439-2:2010
Industrijska komunikacijska omrežja - Avtomatizacija omrežja z visoko
razpoložljivostjo - 2. del: Protokol z redundanco medijev (MRP) (IEC 62439-2:2016)
Industrial communication networks - High availability automation networks - Part 2:
Media Redundancy Protocol (MRP) (IEC 62439-2:2016)
Industrielle Kommunikationsnetze: Hochverfügbare Automatisierungsnetze - Teil 2:
Medienredundanz-Protokoll (MRP) (IEC 62439-2:2016)
Réseaux de communication industriels – Réseaux d'automatisme à haute disponibilité –
Partie 2: Protocole de redondance du support (MRP) (IEC 62439-2:2016)
Ta slovenski standard je istoveten z: EN 62439-2:2017
ICS:
25.040.01 Sistemi za avtomatizacijo v Industrial automation
industriji na splošno systems in general
35.110 Omreževanje Networking
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

EUROPEAN STANDARD EN 62439-2
NORME EUROPÉENNE
EUROPÄISCHE NORM
November 2017
ICS 25.040, 35.040 Supersedes EN 62439-2:2010
English Version
Industrial communication networks - High availability automation
networks - Part 2: Media Redundancy Protocol (MRP)
(IEC 62439-2:2016)
Réseaux de communication industriels - Réseaux Industrielle Kommunikationsnetze: Hochverfügbare
d'automatisme à haute disponibilité - Partie 2: Protocole de Automatisierungsnetze - Teil 2: Medienredundanz-Protokoll
redondance du support (MRP) (MRP)
(IEC 62439-2:2016) (IEC 62439-2:2016)
This European Standard was approved by CENELEC on 2016-03-30. CENELEC members are bound to comply with the CEN/CENELEC
Internal Regulations which stipulate the conditions for giving this European Standard the status of a national standard without any alteration.
Up-to-date lists and bibliographical references concerning such national standards may be obtained on application to the CEN-CENELEC
Management Centre or to any CENELEC member.
This European Standard exists in three official versions (English, French, German). A version in any other language made by translation
under the responsibility of a CENELEC member into its own language and notified to the CEN-CENELEC Management Centre has the
same status as the official versions.
CENELEC members are the national electrotechnical committees of Austria, Belgium, Bulgaria, Croatia, Cyprus, the Czech Republic,
Denmark, Estonia, Finland, Former Yugoslav Republic of Macedonia, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia,
Lithuania, Luxembourg, Malta, the Netherlands, Norway, Poland, Portugal, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden,
Switzerland, Turkey and the United Kingdom.

European Committee for Electrotechnical Standardization
Comité Européen de Normalisation Electrotechnique
Europäisches Komitee für Elektrotechnische Normung
CEN-CENELEC Management Centre: Rue de la Science 23, B-1040 Brussels
© 2017 CENELEC All rights of exploitation in any form and by any means reserved worldwide for CENELEC Members.
Ref. No. EN 62439-2:2017 E
European foreword
The text of document 65C/583/FDIS, future edition 2 of IEC 62439-2, prepared by SC 65C "Industrial
networks" of IEC/TC 65X "Industrial-process measurement, control and automation" was submitted to
the IEC-CENELEC parallel vote and approved by CENELEC as EN 62439-2:2017.

The following dates are fixed:
• latest date by which the document has to be (dop) 2018-06-08
implemented at national level by
publication of an identical national
standard or by endorsement
(dow) 2021-12-08
• latest date by which the national
standards conflicting with the
document have to be withdrawn
This document supersedes EN 62439-2:2010.

Attention is drawn to the possibility that some of the elements of this document may be the subject of
patent rights. CENELEC shall not be held responsible for identifying any or all such patent rights.

Endorsement notice
The text of the International Standard IEC 62439-2:2016 was approved by CENELEC as a European
Standard without any modification.
In the official version, for Bibliography, the following notes have to be added for the standards indicated:

IEC 61158-2:2007 NOTE Harmonized as EN 61158-2:2008 (not modified).
IEC 61158-5-10 NOTE Harmonized as EN 61158-5-10.
IEC 61784-1:2007 NOTE Harmonized as EN 61784-1:2008 (not modified).
IEC 61784-2:2007 NOTE Harmonized as EN 61784-2:2008 (not modified).
IEC 62439-3 NOTE Harmonized as EN 62439-3.
IEC 62439-4 NOTE Harmonized as EN 62439-4.
IEC 62439-6 NOTE Harmonized as EN 62439-6.

Withdrawn publication, the active edition is EN 61158-2:2014 (IEC 61158-2:2014).
Withdrawn publication, the active edition is EN 61784-1:2014 (IEC 61784-1:2014).
Withdrawn publication, the active edition is EN 61784-2:2014 (IEC 61784-2:2014).
Annex ZA
(normative)
Normative references to international publications
with their corresponding European publications

The following documents are referred to in the text in such a way that some or all of their content
constitutes requirements of this document. For dated references, only the edition cited applies. For
undated references, the latest edition of the referenced document (including any amendments)
applies.
NOTE 1  Where an International Publication has been modified by common modifications, indicated by (mod), the relevant
EN/HD applies.
NOTE 2  Up-to-date information on the latest versions of the European Standards listed in this annex is available here:
www.cenelec.eu.
Publication Year Title EN/HD Year
IEC 60050-191 - International Electrotechnical Vocabulary - - -
Chapter 191: Dependability and quality of
service
IEC 61158-6-10 2014 Industrial communication networks - EN 61158-6-10 2014
Fieldbus specifications - Part 6-10:
Application layer protocol specification -
Type 10 elements
IEC 61784-1 -  Digital data communications for EN 61784-1 -
measurement and control -- Part 1: Profile
sets for continuous and discrete
manufacturing relative to fieldbus use in
industrial control systems
IEC 61784-2 -  Industrial communication networks - EN 61784-2 -
Profiles -- Part 2: Additional fieldbus
profiles for real-time networks based on
ISO/IEC 8802-3
IEC 62439-1 2010 Industrial communication networks - High EN 62439-1 2010
availability automation networks -- Part 1:
General concepts and calculation methods
+ A1 2012 +A1 2012
ISO/IEC 10164-1 -  Information technology; Open Systems - -
Interconnection; systems management:
object management function
ISO/IEC/IEEE 8802-3 -  Standard for Ethernet - -
IEEE 802.1D 2004 IEEE Standard for local and metropolitan - -
area networks - Media Access Control
(MAC) Bridges
IEEE 802.1Q 2011 IEEE Standard for Local and metropolitan - -
area networks - Media Access Control
(MAC) Bridges and Virtual Bridged Local
Area Networks
IEC 62439-2 ®
Edition 2.0 2016-03
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
colour
inside
Industrial communication networks – High availability automation networks –

Part 2: Media Redundancy Protocol (MRP)

Réseaux de communication industriels – Réseaux d'automatisme à haute

disponibilité –
Partie 2: Protocole de redondance du support (MRP)

INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
INTERNATIONALE
ICS 25.040, 35.040 ISBN 978-2-8322-3149-4

– 2 – IEC 62439-2:2016  IEC 2016
CONTENTS
FOREWORD . 7
INTRODUCTION . 9
1 Scope . 11
2 Normative references. 11
3 Terms, definitions, abbreviations, acronyms, and conventions . 12
3.1 Terms and definitions . 12
3.2 Abbreviations and acronyms . 12
3.3 Conventions . 12
4 MRP Overview . 12
5 MRP Media redundancy behavior . 16
5.1 General . 16
5.2 Ring ports . 16
5.3 Media Redundancy Manager (MRM) . 17
5.4 Media Redundancy Client (MRC) . 19
5.5 Redundancy domain . 19
5.6 Media Link Check . 19
5.7 Application of the Continuity Check protocol . 19
5.7.1 General . 19
5.7.2 Continuity Check Message Interval . 20
5.7.3 Maintenance Domain Level . 20
5.7.4 Maintenance Association ID (MAID) . 20
5.7.5 Maintenance Association End Point ID (MEPID) . 20
5.7.6 Sender ID TLV . 20
5.7.7 Port Status TLV . 21
5.7.8 Interface Status TLV . 21
5.8 Usage with diagnosis and alarms . 21
5.9 Ring diagnosis . 21
5.10 Multiple MRM in a single ring: Manager voting option . 21
5.10.1 General . 21
5.10.2 Basic principle of the manager voting process . 22
5.10.3 The manager voting process . 23
5.11 BLOCKED not supported (Option). 25
5.12 Interconnection port . 25
5.13 Media redundancy Interconnection Manager (MIM) . 26
5.14 Media redundancy Interconnection Client (MIC) . 29
5.15 Interconnection domain . 29
5.16 Interconnection diagnosis . 30
6 MRP Class specification . 30
6.1 General . 30
6.2 Template. 30
6.2.1 Media redundancy template . 30
6.2.2 Media redundancy Interconnection template . 31
6.3 Attributes . 32
7 MRP Service specification . 36
7.1 Start MRM . 36

IEC 62439-2:2016  IEC 2016 – 3 –
7.2 Stop MRM . 38
7.3 State Change . 38
7.4 Start MRC . 39
7.5 Stop MRC . 41
7.6 Read MRM . 41
7.7 Read MRC . 43
7.8 Start MIM . 45
7.9 Stop MIM . 46
7.10 Interconnection State Change. 47
7.11 Start MIC . 48
7.12 Stop MIC. 49
7.13 Read MIM . 50
7.14 Read MIC . 52
8 MRP protocol specification . 54
8.1 PDU description . 54
8.1.1 Basic data types . 54
8.1.2 DLPDU abstract syntax reference . 54
8.1.3 Coding of the DLPDU field SourceAddress . 54
8.1.4 Coding of the DLPDU field DestinationAddress . 55
8.1.5 Coding of the field TagControlInformation . 55
8.1.6 Coding of the field LT . 56
8.1.7 MRP APDU abstract syntax . 56
8.1.8 Coding of the field MRP_TLVHeader . 57
8.1.9 Coding of the field MRP_SubTLVHeader . 58
8.1.10 Coding of the field MRP_Ed1Type and MRP_Ed1ManufacturerData . 58
8.1.11 Coding of the field MRP_Version . 59
8.1.12 Coding of the field MRP_SequenceID . 59
8.1.13 Coding of the field MRP_SA . 59
8.1.14 Coding of the field MRP_OtherMRMSA . 59
8.1.15 Coding of the field MRP_Prio . 60
8.1.16 Coding of the field MRP_OtherMRMPrio . 60
8.1.17 Coding of the field MRP_PortRole . 60
8.1.18 Coding of the field MRP_RingState . 60
8.1.19 Coding of the field MRP_Interval . 61
8.1.20 Coding of the field MRP_Transition . 61
8.1.21 Coding of the field MRP_TimeStamp . 61
8.1.22 Coding of the field MRP_Blocked . 61
8.1.23 Coding of the field MRP_ManufacturerOUI . 62
8.1.24 Coding of the field MRP_IECOUI . 62
8.1.25 Coding of the field MRP_ManufacturerData . 62
8.1.26 Coding of the field MRP_DomainUUID . 62
8.1.27 Coding of the field MRP_InState . 62
8.1.28 Coding of the field MRP_InID . 63
8.2 Protocol machines . 63
8.2.1 MRM protocol machine . 63
8.2.2 MRC protocol machine . 74
8.2.3 MRA protocol machine . 80
8.2.4 MRA, MRM and MRC functions . 100
8.2.5 FDB clear timer . 105

– 4 – IEC 62439-2:2016  IEC 2016
8.2.6 Topology change timer . 105
8.2.7 MIM protocol machine . 106
8.2.8 MIC protocol machine . 115
8.2.9 MIM and MIC functions . 123
8.2.10 Interconnection Topology Change timer . 127
8.2.11 Interconnection Link Status Poll timer . 127
9 MRP installation, configuration and repair . 128
9.1 Ring port and Interconnection port parameters . 128
9.2 Ring topology parameters . 128
9.3 MRM parameters . 128
9.4 MRC parameters and constraints . 129
9.5 MRA compatibility to earlier Automanager protocol version . 129
9.6 Interconnection topology parameters . 130
9.7 MIM parameters . 130
9.8 MIC parameters and constraints . 130
9.9 Calculation of MRP ring recovery time . 131
9.9.1 Overview . 131
9.9.2 Deduction of formula . 131
9.9.3 Worst case calculation for recovery time of 10 ms . 133
9.9.4 Worst case calculation for 50 devices . 134
9.10 Calculation of MRP Automanager voting time . 134
10 MRP Management Information Base (MIB) . 134
10.1 General . 134
10.2 MRP MIB with a monitoring view . 134
10.3 MRP MIB with a management and monitoring view . 147
Annex A (normative) Optional earlier version of the Automanager protocol . 162
Bibliography . 163

Figure 1 – Two MRP rings redundantly connected via MRP Interconnection . 14
Figure 2 – MRP stack . 16
Figure 3 – MRP ring topology with one manager and clients . 17
Figure 4 – MRP open ring with MRM . 18
Figure 5 – MRP ring with MRA at network startup . 22
Figure 6 – MRP ring after the manager voting process . 22
Figure 7 – Manager voting process . 24
Figure 8 – MRA located outside the MRP ring . 25
Figure 9 – MRP Interconnection topology . 27
Figure 10 – MRP ring interconnection open . 28
Figure 11 – MRP protocol machine for MRM . 63
Figure 12 – MRP protocol machine for MRC . 74
Figure 13 – MRP protocol machine for MRA . 81
Figure 14 – MRP protocol machine for MIM in RC-mode and LC-mode . 107
Figure 15 – MRP protocol machine for MIC in RC-mode and LC-mode . 116

Table 1 – Patent information . 9
Table 2 – Coding of the Maintenance Association ID (MAID) . 20

IEC 62439-2:2016  IEC 2016 – 5 –
Table 3 – MRP Start MRM . 36
Table 4 – MRP Stop MRM . 38
Table 5 – MRP Change State . 39
Table 6 – MRP Start MRC . 40
Table 7 – MRP Stop MRC . 41
Table 8 – MRP Read MRM . 42
Table 9 – MRP Read MRC . 44
Table 10 – MRP Start MIM . 45
Table 11 – MRP Stop MIM . 47
Table 12 – MRP Interconnection Change State . 47
Table 13 – MRP Start MIC . 48
Table 14 – MRP Stop MIC . 50
Table 15 – MRP Read MIM . 51
Table 16 – MRP Read MIC . 53
Table 17 – MRP DLPDU syntax for ISO/IEC/IEEE 8802-3 (IEEE 802.3) . 54
Table 18 – MRP OUI . 55
Table 19 – MRP MulticastMACAddress . 55
Table 20 – MRP TagControlInformation.Priority field . 56
Table 21 – MRP LT field . 56
Table 22 – MRP APDU syntax . 56
Table 23 – MRP Substitutions . 57
Table 24 – MRP_TLVHeader.Type . 58
Table 25 – MRP_SubTLVHeader.Type . 58
Table 26 – MRP_Ed1Type and MRP_Ed1ManufacturerData . 59
Table 27 – MRP_Ed1Type and MRP_Ed1ManufacturerData . 59
Table 28 – MRP_Version . 59
Table 29 – Coding of the field MRP_OtherMRMSA . 60
Table 30 – MRP_Prio . 60
Table 31 – Coding of the field MRP_OtherMRMPrio . 60
Table 32 – MRP_PortRole . 60
Table 33 – MRP_RingState . 61
Table 34 – MRP_Interval . 61
Table 35 – MRP_Transition . 61
Table 36 – MRP_TimeStamp . 61
Table 37 – MRP_Blocked . 62
Table 38 – MRP_DomainUUID . 62
Table 39 – MRP_InState . 62
Table 40 – MRP Local variables of MRM protocol machine . 65
Table 41 – MRM State machine . 66
Table 42 – MRP Local variables of MRC protocol machine. 75
Table 43 – MRC state machine . 76
Table 44 – MRP local variables of MRA protocol machine . 82
Table 45 – MRA state machine . 83

– 6 – IEC 62439-2:2016  IEC 2016
Table 46 – MRP functions and macros . 101
Table 47 – MRP FDB clear timer . 105
Table 48 – MRP topology change timer . 106
Table 49 – MRP Local variables of MIM protocol machine . 108
Table 50 – MIM State machine for LC-mode . 109
Table 51 – MIM State machine for RC-mode . 112
Table 52 – MRP Local variables of MIC protocol machine . 117
Table 53 – MIC State machine for LC-mode . 118
Table 54 – MIC State machine for RC-mode . 121
Table 55 – MRP Interconnection functions . 124
Table 56 – MRP Interconnection topology change timer . 127
Table 57 – MRP Interconnection link status poll timer . 128
Table 58 – MRP Network/Connection parameters . 128
Table 59 – MRP MRM parameters . 129
Table 60 – MRP MRC parameters . 129
Table 61 – MRP MIM parameters . 130
Table 62 – MRP MIC parameters . 131
Table A.1 – Compatible mode MRP_Option for MRP_Test Substitutions . 162
Table A.2 – Compatible mode MRP_Option frames MRP_TestMgrNAck and
MRP_TestPropagate Substitutions . 162

IEC 62439-2:2016  IEC 2016 – 7 –
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
INDUSTRIAL COMMUNICATION NETWORKS –
HIGH AVAILABILITY AUTOMATION NETWORKS –

Part 2: Media Redundancy Protocol (MRP)

FOREWORD
1) The International Electrotechnical Commission (IEC) is a worldwide organization for standardization comprising
all national electrotechnical committees (IEC National Committees). The object of IEC is to promote
international co-operation on all questions concerning standardization in the electrical and electronic fields. To
this end and in addition to other activities, IEC publishes International Standards, Technical Specifications,
Technical Reports, Publicly Available Specifications (PAS) and Guides (hereafter referred to as “IEC
Publication(s)”). Their preparation is entrusted to technical committees; any IEC National Committee interested
in the subject dealt with may participate in this preparatory work. International, governmental and non-
governmental organizations liaising with the IEC also participate in this preparation. IEC collaborates closely
with the International Organization for Standardization (ISO) in accordance with conditions determined by
agreement between the two organizations.
2) The formal decisions or agreements of IEC on technical matters express, as nearly as possible, an international
consensus of opinion on the relevant subjects since each technical committee has representation from all
interested IEC National Committees.
3) IEC Publications have the form of recommendations for international use and are accepted by IEC National
Committees in that sense. While all reasonable efforts are made to ensure that the technical content of IEC
Publications is accurate, IEC cannot be held responsible for the way in which they are used or for any
misinterpretation by any end user.
4) In order to promote international uniformity, IEC National Committees undertake to apply IEC Publications
transparently to the maximum extent possible in their national and regional publications. Any divergence
between any IEC Publication and the corresponding national or regional publication shall be clearly indicated in
the latter.
5) IEC itself does not provide any attestation of conformity. Independent certification bodies provide conformity
assessment services and, in some areas, access to IEC marks of conformity. IEC is not responsible for any
services carried out by independent certification bodies.
6) All users should ensure that they have the latest edition of this publication.
7) No liability shall attach to IEC or its directors, employees, servants or agents including individual experts and
members of its technical committees and IEC National Committees for any personal injury, property damage or
other damage of any nature whatsoever, whether direct or indirect, or for costs (including legal fees) and
expenses arising out of the publication, use of, or reliance upon, this IEC Publication or any other IEC
Publications.
8) Attention is drawn to the Normative references cited in this publication. Use of the referenced publications is
indispensable for the correct application of this publication.
International Standard IEC 62439-2 has been prepared by subcommittee 65C: Industrial
networks, of IEC technical committee 65: Industrial-process measurement, control and
automation.
This second edition cancels and replaces the first edition published in 2010. This edition
constitutes a technical revision.
This edition includes the following significant technical changes with respect to the previous
edition:
– adding a protocol extension to select the media redundancy manager automatically;
– adding a protocol to redundantly connect media redundancy protocol rings.

– 8 – IEC 62439-2:2016  IEC 2016
The text of this standard is based on the following documents:
FDIS Report on voting
65C/834/FDIS 65C/841/RVD
Full information on the voting for the approval of this standard can be found in the report on
voting indicated in the above table.
This publication has been drafted in accordance with ISO/IEC Directives, Part 2.
This International Standard is to be read in conjunction with IEC 62439-1.
A list of all parts of the IEC 62439 series, published under the general title Industrial
communication networks – High availability automation networks, can be found on the IEC
website.
The committee has decided that the contents of this publication will remain unchanged until
the stability date indicated on the IEC web site under "http://webstore.iec.ch" in the data
related to the specific publication. At this date, the publication will be
• reconfirmed,
• withdrawn,
• replaced by a revised edition, or
• amended.
IMPORTANT – The 'colour inside' logo on the cover page of this publication indicates
that it contains colours which are considered to be useful for the correct
understanding of its contents. Users should therefore print this document using a
colour printer.
IEC 62439-2:2016  IEC 2016 – 9 –
INTRODUCTION
The IEC 62439 series specifies relevant principles for high availability networks that meet the
requirements for industrial automation networks.
In the fault-free state of the network, the protocols of the IEC 62439 series provide
ISO/IEC/IEEE 8802-3 (IEEE 802.3) compatible, reliable data communication, and preserve
determinism of real-time data communication. In cases of fault, removal, and insertion of a
component, they provide deterministic recovery times.
These protocols retain fully the typical Ethernet communication capabilities as used in the
office world, so that the software involved remains applicable.
The market is in need of several network solutions, each with different performance
characteristics and functional capabilities, matching diverse application requirements. These
solutions support different redundancy topologies and mechanisms which are introduced in
IEC 62439-1 and specified in the other Parts of the IEC 62439 series. IEC 62439-1 also
distinguishes between the different solutions, giving guidance to the user.
The IEC 62439 series follows the general structure and terms of the IEC 61158 series.
The International Electrotechnical Commission (IEC) draws attention to the fact that it is
claimed that compliance with this document may involve the use of a patent concerning ring
protocol given in Clause 5. Table 1 gives an overview of the relevant patents.
Table 1 – Patent information
No. Status Country Granted Patent Number Title
or
Application Number (if
pending)
1 granted US US 6430151 Local networking with redundancy properties
having a redundancy manager
granted CA CA 2323429
granted CN CN 117195
granted NO NO 330908
granted EP (AT, BE, CH, EP 1062787
DE, DK, ES, FR,
GB, IT, NL, SE)
IEC takes no position concerning the evidence, validity and scope of this patent right.
The holder of this patent right has assured the IEC that he/she is willing to negotiate licences
either free of charge or under reasonable and non-discriminatory terms and conditions with
applicants throughout the world. In this respect, the statement of the holder of this patent right
is registered with IEC. Information may be obtained from:
Siemens Aktiengesellschaft
Otto-Hahn-Ring 6
Munich 81739
Germany
and
Hirschmann Automation and Control GmbH
Stuttgarter Strasse 45-51
– 10 – IEC 62439-2:2016  IEC 2016
Neckartenzlingen 72654
Germany
Attention is drawn to the possibility that some of the elements of this document may be the
subject of patent rights other than those identified above. IEC shall not be held responsible for
identifying any or all such patent rights.
ISO (www.iso.org/patents) and IEC (http://patents.iec.ch/) maintain on-line data bases of
patents relevant to their standards. Users are encouraged to consult the data bases for the
most up to date information concerning patents.

IEC 62439-2:2016  IEC 2016 – 11 –
INDUSTRIAL COMMUNICATION NETWORKS –
HIGH AVAILABILITY AUTOMATION NETWORKS –

Part 2: Media Redundancy Protocol (MRP)

1 Scope
The IEC 62439 series is applicable to high-availability automation networks based on the
ISO/IEC/IEEE 8802-3 (IEEE 802.3) (Ethernet) technology.
This part of the IEC 62439 series specifies a recovery protocol based on a ring topology,
designed to react deterministically on a single failure of an inter-switch link or switch in the
network, under the control of a dedicated media redundancy manager node.
2 Normative references
The following documents, in whole or in part, are normatively referenced in this document and
are indispensable for its application. For dated references, only the edition cited applies. For
undated references, the latest edition of the referenced document (including any
amendments) applies.
IEC 60050-191, International Electrotechnical Vocabulary – Chapter 191: Dependability and
quality of service
IEC 61158-6-10:2014, Industrial communication networks – Fieldbus specifications –
Part 6-10: Application layer protocol specification – Type 10 elements
IEC 61784-1, Industrial communication networks – Profiles – Part 1: Fieldbus profiles
IEC 61784-2, Industrial communication networks – Profiles – Part 2: Additional fieldbus
profiles for real-time networks based on ISO/IEC 8802-3
IEC 62439-1:2010, Industrial communication networks – High availability automation networks
– Part 1: General concepts and calculation methods
IEC 62439-1:2010/AMD1:2012
ISO/IEC 10164-1, Information technology – Open Systems Interconnection – Systems
Management: Object Management Function
ISO/IEC/IEEE 8802-3 Standard for Ethernet
IEEE 802.1D:2004, IEEE Standard for Local and metropolitan area networks – Media Access
Control (MAC) Bridges
IEEE 802.1Q:2011, IEEE Standard for Local and metropolitan area networks – Media Access
Control (MAC) Bridges and Virtual Bridge Local Area Network
___________
A consolidated version of this publication exists, comprising IEC 62439-1:2010 and
IEC 62439-1:2010/AMD1:2012.
– 12 – IEC 62439-2:2016  IEC 2016
3 Terms, definitions, abbreviations, acronyms, and conventions
3.1 Terms and definitions
For the purposes of this document, the terms and definitions given in IEC 60050-191, as well
as in IEC 62439-1, as well as the following, apply.
3.1.1
interconnection port
port of a switch that is used to interconnect two ring topologies
3.1.2
interconnection topology
topology in which two ring topologies are connected
3.2 Abbreviations and acronyms
For the purposes of this document, the abbreviations and acronyms given in IEC 62439-1
apply, in addition to the following.
ASE Application Service Element
CCM Continuity Check Messages
CFM Connectivity Fault Management
CFM-MRP Connectivity Fault Management for MRP
CPU Central Processing Unit
FDB Filtering Database
LC-mode Link Check mode
LSB Least Significant Bit
MAID Maintenance Association ID
MD Maintenance Domain
MD Level Maintenance Domain Level
MEP Maintenance End Point
MEPID Maintenance Association End Point ID
MIB Management Information Base
MRA Media Redundancy Automanager
MRC Media Redundancy Client
MRM Media Redundancy Manager
MRP Media Redundancy Protocol
MIC Media Redundancy Interconnection Client
MIM Media Redundancy Interconnection Manager
RC-mode Ring Check mode
3.3 Conventions
This document follows the conventions defined in IEC 62439-1.
4 MRP Overview
This document specifies the Media Redundancy Protocol (MRP), a recovery protocol based
on a ring topology, and the redundant interconnection of MRP rings via the Media
Redundancy Interconnection Protocol as shown in Figure 1.

IEC 62439-2:2016  IEC 2016 – 13 –
MRP is designed to react deterministically on a single failure of an
...