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IPv6 evolution technical requirements - Part 2: SRv6-based IP bearer network
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Basic data
| Standard ID | GB/T 44887.2-2025 (GB/T44887.2-2025) |
| Description (Translated English) | IPv6 evolution technical requirements - Part 2: SRv6-based IP bearer network |
| Sector / Industry | National Standard (Recommended) |
| Classification of Chinese Standard | L78 |
| Classification of International Standard | 33.040.40 |
| Word Count Estimation | 14,132 |
| Date of Issue | 2025-10-05 |
| Date of Implementation | 2026-05-01 |
| Issuing agency(ies) | State Administration for Market Regulation and Standardization Administration of China |
GB/T 44887.2-2025: IPv6 evolution technical requirements - Part 2: SRv6-based IP bearer network
---This is a DRAFT version for illustration, not a final translation. Full copy of true-PDF in English version (including equations, symbols, images, flow-chart, tables, and figures etc.) will be manually/carefully translated upon your order.
ICS 33.040.40
CCSL78
National Standards of the People's Republic of China
IPv6 Evolution Technical Requirements Part 2.
IP bearer network based on IPv6 segment routing (SRv6)
Part 2.SRv6-basedIPbearernetwork
Implemented on May 1, 2026
State Administration for Market Regulation
The State Administration for Standardization issued a statement.
Table of contents
Preface III
Introduction IV
1.Scope 1
2 Normative References 1
3.Terms and Definitions 1
4.Abbreviations 1
5.Overall Architecture of IP Bearer Network Based on SRv6 2
6.SRv6-based device layer technical requirements 3
7.Technical requirements for the SRv6-based control layer 6.
References 8
Foreword
This document complies with the provisions of GB/T 1.1-2020 "Standardization Work Guidelines Part 1.Structure and Drafting Rules of Standardization Documents".
Drafting.
This document is Part 2 of GB/T 44887 "Technical Requirements for IPv6 Evolution". GB/T 44887 has already published the following parts.
---Part 1.Reference Architecture;
---Part 2.IP Bearer Networks Based on IPv6 Segment Routing (SRv6);
---Part 3.IPv6 Segment Routing Header (SRH);
---Part 4.Network Programming Based on IPv6 Segment Routing (SRv6);
---Part 5.Virtual Private Networks (VPNs) Based on IPv6 Segment Routing (SRv6);
---Part 6.IPv6 Segment Routing (SRv6) Policy;
---Part 7.Service Chaining Based on IPv6 Segment Routing (SRv6);
---Part 8.Packet Header Compression Based on IPv6 Segment Routing (SRv6);
---Part 9.Network Fault Protection Based on IPv6 Segment Routing (SRv6);
---Part 10.Enhanced Virtual Private Networks (VPNs) Supporting IP Network Slicing;
---Part 11.IPv6 Flow Detection Technology.
Please note that some content in this document may involve patents. The issuing organization of this document assumes no responsibility for identifying patents.
This document was proposed by the Ministry of Industry and Information Technology of the People's Republic of China.
This document is under the jurisdiction of the National Telecommunications Standardization Technical Committee (SAC/TC485).
This document was drafted by. China United Network Communications Group Co., Ltd., China Mobile Communications Group Co., Ltd., and Huawei Technologies Co., Ltd.
Company, China Telecom Group Corporation, China Academy of Information and Communications Technology, China Information and Communications Technology Group Corporation, ZTE Corporation
The company, Shanghai Nokia Bell Co., Ltd., H3C Technologies Co., Ltd., Next Generation Internet Key Technologies and Evaluation Beijing Engineering
Research Center Co., Ltd., China Mobile (Hangzhou) Information Technology Co., Ltd.
This document was drafted by. Pang Ran, Wang Haijun, Cheng Weiqiang, Peng Shuping, Zhu Keyi, Wu Youming, Gao Wei, Liu Yan, Wang Junfang, Liu Jianhua, and Chen Ran.
Liu Yao, Gu Fangfang, Wan Xiaolan, Meng Dan, Yu Haisheng, Song Yang, Liu Wenbin, Liang Fang.
Introduction
According to the "Notice on Accelerating the Large-Scale Deployment and Application of Internet Protocol Version 6 (IPv6)," in order to accelerate the transformation of government applications,
To expand industry integration and application, and to promote the standardization of large-scale IPv6 deployment and application innovations, my country has formulated a series of IPv6 standards.
In China, GB/T 44887 "Technical Requirements for IPv6 Evolution" is formulated to standardize the national IPv6 deployment and is proposed to consist of eleven parts.
---Part 1.Reference Architecture. The purpose is to define the application scenarios of IPv6 evolution technology in the operator and industry sectors, and in...
Deployment in carrier and industry networks.
---Part 2.IP Bearer Networks Based on IPv6 Segment Routing (SRv6). The purpose is to define IP bearer networks based on SRv6.
Overall architecture, SRv6-based device layer technical requirements, and SRv6-based control layer technical requirements.
---Part 3.IPv6 Segment Routing Header (SRH). The purpose is to define the format of the IPv6 segment routing header (SRH), and...
SRH's technical requirements for node processing.
---Part 4.Network Programming Based on IPv6 Segment Routing (SRv6). The purpose is to define the data platform for SRv6 network programming.
Surface, control plane, management plane.
---Part 5.Virtual Private Networks (VPNs) Based on IPv6 Segment Routing (SRv6). The purpose is to define SRv6-based VPNs.
The network processing flow and protocol messages include the implementation of Layer 3 services and Layer 2 services.
---Part 6.IPv6 Segment Routing (SRv6) Policy. The purpose is to specify the network devices that support SRv6 policy-based technologies.
Development, design, and testing, etc.
---Part 7.Service Chaining Based on IPv6 Segment Routing (SRv6). The purpose is to define the data plane of SRv6-based service chains and...
Control plane technical requirements are used to support the development, design, and testing of network devices based on SRv6 header compression.
---Part 8.Packet Header Compression Based on IPv6 Segment Routing (SRv6). The purpose is to define the segment identifier structure for SRv6 header compression.
Requirements such as structure, data plane forwarding, control plane protocol extension, cross-domain deployment, and protection are designed to support SRv6-based packets.
The development, design, and testing of head-compressed network devices.
---Part 9.Network Fault Protection Based on IPv6 Segment Routing (SRv6). The purpose is to specify SRv6BE links/nodes,
SRv6 specifies intermediate nodes, SRv6 tail nodes, micro-loop prevention, and SRv6 end-to-end technologies for SRv6 network fault protection.
Seeking the development, testing, and application of devices with network protection capabilities for SRv6 networking scenarios, particularly in the event of node/link failures.
Deployment, etc.
---Part 10.Enhanced Virtual Private Networks (VPNs) Supporting IP Network Slicing. The purpose is to define enhanced virtual private networks (VPNs).
The technical architecture of VPN, VPN technical requirements, and the VPN implementation process based on SR.
---Part 11.IPv6 Flow-Based Inspection Technology. The purpose is to specify data plane flow-based inspection technologies applicable to various service carrying scenarios.
The development, testing, and deployment of automated quality measurement of information, as well as the flow detection function of IP network devices.
IPv6 Evolution Technical Requirements Part 2.
IP bearer network based on IPv6 segment routing (SRv6)
1 Scope
This document defines the overall architecture of SRv6-based IP bearer networks, specifies the device layer technical requirements for SRv6-based systems, and outlines the underlying technologies.
SRv6 control layer technical requirements.
This document applies to network construction and equipment development for IP bearer networks that support SRv6.
2 Normative references
The contents of the following documents, through normative references within the text, constitute essential provisions of this document. Dated citations are not included.
For references to documents, only the version corresponding to that date applies to this document; for undated references, the latest version (including all amendments) applies.
This document.
GB/T 44887.1-2025 IPv6 Evolution Technical Requirements Part 1.Reference Architecture
GB/T 44887.4-2025 IPv6 Evolution Technical Requirements Part 4.Network Programming Based on IPv6 Segment Routing (SRv6)
GB/T 44887.7-2025 IPv6 Evolution Technical Requirements Part 7.Service Chaining Based on IPv6 Segment Routing (SRv6)
GB/T 44887.8-2025 IPv6 Evolution Technical Requirements Part 8.Header Compression Based on IPv6 Segment Routing (SRv6)
GB/T 44887.9-2025 IPv6 Evolution Technical Requirements Part 9.Network Fault Protection Based on IPv6 Segment Routing (SRv6)
3 Terms and Definitions
The terms and definitions defined in GB/T 44887.1-2025 apply to this document.
4.Abbreviations
The following abbreviations apply to this document.
ARG. Optional Arguments section
Bit. Binary digit
IP. Internet Protocol
...
