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IPv6 evolution technical requirements - Part 8: Packet header compression for segment routing over IPv6(SRv6)
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| Standard ID | GB/T 44887.8-2025 (GB/T44887.8-2025) |
| Description (Translated English) | IPv6 evolution technical requirements - Part 8: Packet header compression for segment routing over IPv6(SRv6) |
| Sector / Industry | National Standard (Recommended) |
| Classification of Chinese Standard | L78 |
| Classification of International Standard | 33.040.40 |
| Word Count Estimation | 26,260 |
| Date of Issue | 2025-10-05 |
| Date of Implementation | 2026-02-01 |
| Issuing agency(ies) | State Administration for Market Regulation and Standardization Administration of China |
GB/T 44887.8-2025: IPv6 evolution technical requirements - Part 8: Packet header compression for segment routing over IPv6(SRv6)
---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 8.IPv6 Segment Routing (SRv6)
Message header compression
Published on 2025-10-05
Implemented on February 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 2
5 SRv6 Head Compressed Segment Identification Structure 3
5.1 SRv6 Header Compressed Segment Identifier Format 3
5.2 G-SID Container 3
6.SRv6 header compressed data plane forwarding requirements 4
6.1 SRv6 Header Compression Feature Type 4
6.2 SRv6 Header Compressed SID Endpoint Behavior Type 4
6.3 SRv6 Header Compression G-SID Index Definition 4
6.4 Encoding Rules and Forwarding Rules 5
7.SRv6 Header Compression Control Plane Protocol Extension Requirements 6
7.1 General Rules for Control Protocol Extensions 6
7.2 IS-IS Protocol Extension Requirements 6
7.2.1 General Requirements for Protocol Extensions 6
7.2.2 Compression Capacity Notification 6
7.2.3 Compressible SID Announcement 7
7.3 BGP-LS Protocol Extension Requirements 8
7.3.1 General Requirements for Protocol Extensions 8
7.3.2 Compression Capacity Notification 8
7.3.3 Compressible SID Announcement 8
7.4 BGPSRPolicy Protocol Extension Requirements 9
7.5 PCEPSRPolicy Protocol Extension Requirements 13
7.5.1 General Rules for Protocol Extensions 13
7.5.2 Compression Capability Notification 13
7.5.3 Compressed routing requests and managed 13
7.5.4 Description of the compressed path 14
8.SRv6 header compression cross-domain deployment requirements 14
8.1 SRv6 Header Compression Cross-Domain SID Orchestration Method 14
8.1.1 SRv6 Header Compression Cross-Domain End-to-End Full SID List Method 14
8.1.2 SRv6 header compression cross-domain end-to-end BSID method 15
8.2 SRv6 Header Compression Cross-Domain Controller Deployment Method 15
8.2.1 Networking of Multiple AS Unified Controllers 15
8.2.2 Joint networking of intra-domain controllers and cross-domain controllers 16
9 SRv6 head compression protection requirement 17
Appendix A (Normative) SRv6 Header Compression Adds Endpoint Behavior Type Encoding 18
Reference 19
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 8 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 Mobile Communications Group Co., Ltd., China Telecom Group Co., Ltd., China Academy of Information and Communications Technology, and China...
United Network Communications Group Co., Ltd., Huawei Technologies Co., Ltd., ZTE Corporation, H3C Technologies Co., Ltd., China Telecom
Information Communication Technology Group Co., Ltd., Nokia Shanghai Bell Co., Ltd., Southeast University, Tsinghua University, Tencent Technology (Shenzhen) Co., Ltd.
Company, Beijing Kuaishou Technology Co., Ltd., China Internet Network Information Center, Ruijie Networks Co., Ltd., Anhui Wantong Post & Telecommunications Co., Ltd.
Company, Beijing Haohan Deep Information Technology Co., Ltd., Bodin Shihua (Beijing) Technology Co., Ltd., Chongqing University of Posts and Telecommunications, Fujian Wanwuyilian
Network Technology Co., Ltd., Suzhou Shengke Communication Co., Ltd., CITES Information Technology Co., Ltd., Maipu Communication Technology Co., Ltd.
Limited Liability Company, Ruiscom Technology Development Co., Ltd., and Nanjing Yiketeng Information Technology Co., Ltd.
The main drafters of this document are. Cheng Weiqiang, Liu Yisong, Duan Xiaodong, Jiang Wenying, Gong Xia, Ma Ke, Zhu Lin, Li Cheng, Liu Yao, Lin Changwang, and Liu Jianhua.
Chen Duan, Li Dan, Geng Jingyi, Qiu Zijun, Yu Haisheng, Liang Yanrong, Hu Jun, Wu Xiaochun, Li Jiangbo, Wang Hao, Xie Yuyan, Cheng Wei, Ma Zhihai, Dong Qin
Jia Rongbin and Wang Jun.
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. Among them,
GB/T 44887, "Technical Requirements for IPv6 Evolution," is designed 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 define SRv6 policies, SRv6 policy routing, and SRv6 policy...
The technical requirements for protection are used to support the development, design, and testing of network devices based on SRv6 policy technology.
---Part 7.Service Chains Based on IPv6 Segment Routing (SRv6). The purpose is to define the data plane of SRv6-based service chains.
And control plane technical requirements, used to support the development, design and testing of network devices based on SRv6 packet 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 header-compressed network devices.
---Part 9.Network Fault Protection Based on IPv6 Segment Routing (SRv6). The purpose is to specify SRv6BE links/nodes,
SRv6 specifies the technical requirements for SRv6 network fault protection, including intermediate nodes, tail nodes, micro-loop prevention, and end-to-end SRv6.
The development, testing, and deployment of equipment with network protection functions in SRv6 networking scenarios, addressing fault scenarios such as node/link failures.
Signatures, 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 8.IPv6 Segment Routing (SRv6)
Message header compression
1 Scope
This document specifies the segment identifier structure for SRv6 header compression, data plane forwarding, control plane protocol extensions, cross-domain deployment, and protection.
Require.
This document applies to the development, design, and testing of network devices that support SRv6-based header compression.
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 44887.3-2025 IPv6 Evolution Technical Requirements Part 3.IPv6 Segment Routing Header (SRH)
GB/T 44887.4-2025 IPv6 Evolution Technical Requirements Part 4.Network Programming Based on IPv6 Segment Routing (SRv6)
GB/T 44887.9 IPv6 Evolution Technical Requirements Part 9.Network Fault Protection Based on IPv6 Segment Routing (SRv6)
IETF RFC 9352.2023 Supports extensions to the IS-IS protocol in the IPv6 fragmented routing data plane.
3 Terms and Definitions
The following terms and definitions apply to this document.
3.1
controller
Centralized management and control of network resources, responding to SDN application layer requests for network resources and service resources through the northbound interface.
The system requests and performs intelligent calculations based on the user's specific business needs (including internal network optimization needs) and current network resource usage to provide the user with [services/resources].
Network devices that automatically allocate network resources for business operations.
3.2
Head node ingressnode
The source node that generates SRv6 messages.
Note. Used to generate SRv6 policy paths and encapsulate SRv6 packets to begin forwarding.
...
