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GB/T 45987-2025Information technology - Telecommunications and information exchange between systems - Local and metropolitan area networks - Specific requirements - Frame replication and elimination for reliability (English PDF)

信息技术系统间的远程通信和信息交换局域网和城域网特定要求用于可靠性的帧复制和消除

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Issued by

State Administration for Market Regulation, Standardization Administration of China

Level / Type

National · Recommended

Issue date

August 1, 2025

Implementation date

February 1, 2026

Scope

GB/T 45987-2025 is the English-translated version of 信息技术系统间的远程通信和信息交换局域网和城域网特定要求用于可靠性的帧复制和消除.

GB/T 45987-2025 — This document specifies the procedures, management objects, and protocols used to provide for the identification and management of redundantly transmitted data packets for bridges and end systems.

Identification and elimination of duplicate and redundant packets. Does not involve creating multiple paths for transmitting copies. This document is applicable to the research, development and design of time-sensitive network products.

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Document preview — GB/T 45987-2025

National Standard of the People's Republic of China

ICS: 35.100
Classification: L 79

Issued by: State Administration for Market Regulation, Standardization Administration of China

Preface
1 Overview
1.1 Scope
1.2 Basic Principles
1.3 Statechart Conventions
1.4 Normative Model
1.5 Specification Priority
1.6 Introduction
2 Normative references
3 Terms and Definitions
4 Abbreviations
5 Compliance
5.1 Statement of Conformity
5.2 Conforming components and equipment
5.3 Required functional behaviors of flow identification components
5.4 Recommended functional behavior of the flow identification component
5.5 Optional Behavior of the Flow Identification Component
5.6 Required functional behavior of the sending system
5.7 Recommended functional behavior of the sending system
5.8 Optional functional behaviors of the sending system
5.9 Required functional behavior of the receiving system
5.10 Recommended Behavior of the Receiving System
5.11 Optional Behavior of the Receiving System
5.12 Required functional behavior of relay systems
5.13 Recommended functional behavior of relay systems
5.14 Optional Functional Behavior of Relay System
5.15 FRERC component required and optional functional behaviors
6 Stream Identification
6.1 Service Flow Sub-Parameters
6.2 Flow Identification Function
6.3 Flow Identification Function in the System
6.4 Empty Flow Identification
6.5 Source MAC and VLAN Flow Identification
6.6 Active Destination MAC and VLAN Flow Identification
6.7 IP Flow Identification
6.8 Mask Matching Flow Identification
7 Reliability Frame Replication and Elimination (FRER)
7.1 Overview of FRER
7.2 Use of Data Streams
7.3 Frame duplication and elimination for reliability
7.4 Sequence Function
7.5 Independent recovery function
7.6 Sequence Encoding/Decoding Function
7.7 Stream Splitting Function
7.8 Redundant Marking
7.9 HSR Sequence Marker
7.10 PRP sequence trailing
7.11 Automatic Configuration
8 Reliability Frame Replication and Elimination in Bridges
8.1 Restriction Option
8.2 FRERC component input conversion
8.3 FRER and VLAN Tagging
8.4 FRER Configuration in Bridge
9 Flow Identification Management
9.1 Flow Identification Table
9.2 Operational Flow Identification Counters for Each Port and Each Flow
9.3 Operation Flow Identification Counters for Each Port
9.4 Managed Objects per Port
10 FRER Management
10.1 Counter Behavior
10.2 Additional tsnStreamIdEntry Managed Objects
10.3 Sequence Generation Table
10.4 Sequence Recovery Table
10.5 Sequence Identification Table
10.6 Flow Splitting Table
10.7 Automatically configured managed objects
10.8 Operational Per-Port, Per-Flow FRER Counters
10.9 Operational Per-Port FRER Counter
11 Management Information Base (MIB)
11.1 Internet Standards Management Framework
11.2 MIB Structure
11.3 Relationship with other MIBs
11.4 Safety Precautions
11.5 MIB Module
12 YANG Data Model
12.1 YANG Framework
12.2 YANG Model
12.3 Structure of the YANG Model.201
12.4 Relationship with other YANG modules
12.5 Security Considerations
12.6 Definition of 802.1C BAYANG Module
Appendix A (Normative) Protocol Implementation Conformance Statement (PICS) Proforma
A.1 General Principles
A.2 PICS proforma for reliability frame duplication and elimination
Appendix B (Informative) Interoperability with other documents
B.1 Sequence number size
B.2 Stream Sequence and Source Sequence
Appendix C (Informative) Reliability Frame Duplication and Elimination in Systems
C.1 End-to-end FRER
C.2 Stack Position
C.3 Ladder Redundancy
C.4 Multicast Tree
C.5 Protocol Intercommunication
C.6 Chained Dual-Port Terminal System
C.7 Notes
C.8 Balancing Tag Insertions and Deletions
C.9 FRER and Reserved Bandwidth
C.10 Use of independent recovery function
C.11 Use of automatic configuration
Appendix D (Informative) Mask Matching Flow Identification Function
D.1 Example 1.Generic Flow Identification for Industrial Communication Networks
D.2 Example 2.MPLSDetNet flow identifier
Reference

Foreword

This document is in accordance with the provisions of GB/T 1.1-2020 "Guidelines for standardization work Part 1: Structure and drafting rules for standardization documents" Drafting.

This document is equivalent to ISO/IEC/IEEE8802-1CB.2019 "Telecommunications and information exchange between information technology systems Specific requirements for local and metropolitan area networks - Part 1CB. Frame duplication and elimination for reliability.

The following minimal editorial changes have been made to this document.

--- To coordinate with the existing standards, the name of the standard is changed to "Telecommunications and information exchange between information technology systems, local area networks and urban areas" Domain Network Specific Requirements for Frame Duplication and Elimination for Reliability";

---Incorporated ISO/IEC/IEEE8802-1CB.2019/Amd.1.2023, ISO/IEC/IEEE8802-1CB.2019/the amendments to Amd.2.2023 are marked with a vertical double line (|) on the outer margins of the clauses involved.

1 Overview

1.1 Scope

This document specifies the procedures, management objects, and protocols used to provide for the identification and management of redundantly transmitted data packets for bridges and end systems.

Identification and elimination of duplicate and redundant packets. Does not involve creating multiple paths for transmitting copies.

This document is applicable to the research, development and design of time-sensitive network products.

1.2 Basic Principles

Frame Replication and Elimination for Reliability (FRER) is used to increase the probability of a given data frame being delivered.

When FRER is used on a fixed path in a specific topology and when protecting against congestion loss, FRER can greatly reduce the probability of data frame loss due to equipment failure.

1.3 Statechart Conventions

This document uses the C language (ISO/IEC 9899:2011) to record the operation of the conformance system. The description of C functions uses special fixed each C function is given when a given event occurs, such as a description code segment or an accompanying Assume that events occur sequentially rather than simultaneously, and that code routines execute immediately.

1.4 Canonical Model

The operational model given in this document is only the basis for describing the functions of compliant devices.

A device's conformance to this document is deemed to be only for the protocols explicitly given.

1.5 Specification Priority

In the event of any conflict between the various parts of this document, the C functions take precedence over the rest of this document, followed by the normative tables.

The information in the normative text follows, followed by the information in the normative figures. Non-normative tables, figures and text in the appendix, clearly marked.

1.6 Introduction

This document is one of many IEEE 802.1 and other standards applicable to Time Sensitive Networking (TSN). The overall goal of these standards is to Provides extremely low packet loss rate and limited, small, and stable end-to-end delay. TSN supports unicast and multicast packet flow, realizing various high-demand Time-critical applications, including audio and video, industrial processes, and machine and vehicle control, cannot be achieved at the expense of the network's ability to transmit non-time-critical applications.

cost to achieve the goals of TSN.

This document assumes that, at the highest level, there is one sending end-system and one or more receiving end-systems per data flow.

The flow is described by the maximum packet size and the number of packets transmitted per unit time.

The resources required for each hop on the data flow path, including link bandwidth, buffer space and control parameters, to ensure zero congestion loss in data flow transmission.

This path carrying the data flow becomes a reserved path.

......
This preview omits tables, figures, formulas and parts of the technical clauses. The complete document — 239 pages — is available in the English PDF.

Referenced standards

Cited by

GB/T 47800-2026General technical requirements and test methods for industrial 5G terminal communication

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