SRv6 for Power Grid
draft-lu-srv6ops-srv6-for-power-grid-00
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Document | Type | Active Internet-Draft (individual) | |
---|---|---|---|
Authors | Jiangang Lu , Xuesong Geng | ||
Last updated | 2024-10-20 | ||
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draft-lu-srv6ops-srv6-for-power-grid-00
Network Working Group J. Lu Internet-Draft China Southern Power Grid Company Limited Intended status: Experimental X. Geng Expires: 24 April 2025 Huawei 21 October 2024 SRv6 for Power Grid draft-lu-srv6ops-srv6-for-power-grid-00 Abstract This document outlines the deployment of Segment Routing over IPv6 (SRv6) in the power grid communication network, including power grid services, requirement analysis, network structure and different srv6 deployment scenarios. Requirements Language The key words "MUST", "MUST NOT", "REQUIRED", "SHALL", "SHALL NOT", "SHOULD", "SHOULD NOT", "RECOMMENDED", "MAY", and "OPTIONAL" in this document are to be interpreted as described in RFC 2119 [RFC2119]. Status of This Memo This Internet-Draft is submitted in full conformance with the provisions of BCP 78 and BCP 79. Internet-Drafts are working documents of the Internet Engineering Task Force (IETF). Note that other groups may also distribute working documents as Internet-Drafts. The list of current Internet- Drafts is at https://datatracker.ietf.org/drafts/current/. Internet-Drafts are draft documents valid for a maximum of six months and may be updated, replaced, or obsoleted by other documents at any time. It is inappropriate to use Internet-Drafts as reference material or to cite them other than as "work in progress." This Internet-Draft will expire on 24 April 2025. Copyright Notice Copyright (c) 2024 IETF Trust and the persons identified as the document authors. All rights reserved. This document is subject to BCP 78 and the IETF Trust's Legal Provisions Relating to IETF Documents (https://trustee.ietf.org/ license-info) in effect on the date of publication of this document. Lu & Geng Expires 24 April 2025 [Page 1] Internet-Draft draft-lu-srv6ops-srv6-for-power-grid-00 October 2024 Please review these documents carefully, as they describe your rights and restrictions with respect to this document. Code Components extracted from this document must include Revised BSD License text as described in Section 4.e of the Trust Legal Provisions and are provided without warranty as described in the Revised BSD License. Table of Contents 1. Introduction . . . . . . . . . . . . . . . . . . . . . . . . 2 2. Requirement Analysis of Network for Power Grid . . . . . . . 3 2.1. Requirements for Network Capabilities in Power Grid Services . . . . . . . . . . . . . . . . . . . . . . . . 3 2.1.1. Production Services . . . . . . . . . . . . . . . . . 3 2.1.2. Management Office Services . . . . . . . . . . . . . 4 2.1.3. Electricity Trading . . . . . . . . . . . . . . . . . 4 2.2. Gap Analysis for Power Grid Data Network . . . . . . . . 5 2.2.1. Challenges in Multi-Service Integration and Assurance . . . . . . . . . . . . . . . . . . . . . . 5 2.2.2. Limited Network Scalability . . . . . . . . . . . . . 5 3. Network Structure in Power Grid . . . . . . . . . . . . . . . 5 4. SRv6 Deployment Scenario in Power Grid . . . . . . . . . . . 6 4.1. SRv6 Migration . . . . . . . . . . . . . . . . . . . . . 6 4.2. SRv6 Inter-domain . . . . . . . . . . . . . . . . . . . . 7 4.3. SRv6 based Path Selection and Load balancing . . . . . . 7 5. IANA Considerations . . . . . . . . . . . . . . . . . . . . . 7 6. Security Considerations . . . . . . . . . . . . . . . . . . . 7 7. Acknowledgements . . . . . . . . . . . . . . . . . . . . . . 7 8. Normative References . . . . . . . . . . . . . . . . . . . . 7 Authors' Addresses . . . . . . . . . . . . . . . . . . . . . . . 7 1. Introduction Segment Routing over IPv6 (SRv6) has seen increasing deployment in service provider networks, driven by its ability to simplify network operations and improve scalability. SRv6 extends the capabilities of traditional IP routing by enabling flexible path steering, traffic engineering, and network programmability, as specified in existing RFCs such as RFC 8754 and RFC 8986. These features make SRv6 particularly suitable for complex network environments like the power grid, where diverse and critical services need to be supported efficiently. Lu & Geng Expires 24 April 2025 [Page 2] Internet-Draft draft-lu-srv6ops-srv6-for-power-grid-00 October 2024 The power grid communication network supports multiple services with varying requirements, including real-time monitoring, substation communication, and control system coordination. The hierarchical network structure, comprising backbone and municipal levels, provides a robust foundation for deploying SRv6 to meet these demands. SRv6's ability aligns well with the needs of power grid services, enabling efficient management of service-level agreements (SLAs) and enhancing network reliability. This document presents the experience of deploying SRv6 in a power grid communication network, covering aspects such as service requirements, network structure, and various deployment scenarios. 2. Requirement Analysis of Network for Power Grid 2.1. Requirements for Network Capabilities in Power Grid Services The power grid network supports two primary service categories: production dispatch & management and marketing information. These are further divided into voice, data, and video communications, each with specific network requirements to ensure reliable power grid operations 2.1.1. Production Services • Voice Communication: Dispatch Calls: Critical voice communications between dispatch centers, power plants, and substations must maintain high availability with the highest priority. • Video Communication: Substation Surveillance: Video data from unmanned substations is crucial for monitoring specific areas in real time. This data requires transmission rates between 384 kbit/s and 8 Mbit/s (commonly 2 Mbit/s), with a transmission delay of ≤250 ms, an error rate not exceeding 10^-5, and availability requirements of 99.9%. • Data Communication: Lu & Geng Expires 24 April 2025 [Page 3] Internet-Draft draft-lu-srv6ops-srv6-for-power-grid-00 October 2024 Relay Protection and Safety Automation: Signals for relay protection between high-voltage transmission lines and grid safety devices must be highly reliable and have low, fixed transmission delays, including fast command information and real-time data for safety devices. High reliability and low transmission delay are essential for safety signals, with requirements such as delays below 50. Dispatch Automation Data: Real-time monitoring and control data for grid operation are required. Remote data includes telemetry, signaling, control, and regulation information, with transmission rates ranging from 64 kbit/s to 384 kbit/s, a delay of ≤250 ms, and an error rate of 10^-5. 2.1.2. Management Office Services • Management Information Services: Management information services include financial management, marketing, production planning, human resources management, safety supervision information, and information support systems. • Management Office Services: Management office services cover office communication and information management to meet internal and external enterprise communication needs. 2.1.3. Electricity Trading • Energy Metering Data: Transmission methods can include dispatch data networks or dedicated circuits, with a transmission error rate not exceeding 10^-6 and availability requirements of 99.99%. • Trading Data: Spot and futures market data involve substantial data volumes, demanding high transmission accuracy for forecasting and transactions. Lu & Geng Expires 24 April 2025 [Page 4] Internet-Draft draft-lu-srv6ops-srv6-for-power-grid-00 October 2024 2.2. Gap Analysis for Power Grid Data Network Traditional MPLS-based power grid data network could provide secure network isolation and multi-service integration. However, with the growing scale of the grid network and the surge in digital services, MPLS technology faces challenges in meeting requirements of power grid. The main gaps are as follows: 2.2.1. Challenges in Multi-Service Integration and Assurance • Limitations of QoS and Traffic Engineering: Although MPLS theoretically supports Quality of Service (QoS) and traffic engineering for bandwidth guarantees, these techniques have limitations. For example MPLS RSVP TE (Traffic Engineering) requires pre-reserving bandwidth at each network node, resulting in a complex deployment process New digital services demand more advanced network assurance technologies to support comprehensive multi-service integration. 2.2.2. Limited Network Scalability • Increased Demand for Address Space and IPv6 Transition: The new power system, driven by renewable energy, requires interaction between diverse sources, network load, and storage, leading to a need for extensive network connectivity. The deployment of intelligent terminals will necessitate a shift to an IPv6 single-stack network, which the current MPLS network does not support. • Limited Traffic Scheduling Flexibility: With the rise of smart substations and video surveillance, network bandwidth demands are increasing. MPLS struggles to balance traffic across multiple paths, resulting in uneven bandwidth utilization and congestion. 3. Network Structure in Power Grid The power grid communication network is structured into two levels: backbone and municipal. Each level consists of three layers—core, aggregation, and access—creating a clear network topology that facilitates traffic path determination and adjustment. Lu & Geng Expires 24 April 2025 [Page 5] Internet-Draft draft-lu-srv6ops-srv6-for-power-grid-00 October 2024 The core layer of the backbone level adopts a fully meshed network architecture. The aggregation layer routers are connected in a dual- uplink tree topology, linking to the access layer devices, which helps distribute traffic and reduce the load on the core routers. Access layer devices are connected to different aggregation equipment based on service requirements or geographical locations. Key departments such as the headquarters dispatch center, headquarters office area, and data centers are directly connected to the national backbone network. Each municipal network operates as a separate Autonomous System (AS) and also comprises the core, aggregation, and access layers, with dual uplinks to the upper-level network. Most access devices in the municipal networks use either ring topology or dual-uplink tree topology, connecting to substations, power supply bureaus, dispatch centers, and other local facilities. The power grid communication network supports two types of service scenarios based on the scope of business access: intra-domain closed- loop services and inter-domain cross-access services. In the intra-domain scenario, the access network facilitates business activities within a single domain, such as connecting from a power supply station to the municipal data center. This setup is centrally managed within the domain and uses EVPN L3VPN over SRv6 Policy for service delivery. All network elements within the domain are controlled by a unified controller, enabling rapid service provisioning, efficient intra-domain traffic path planning, and traffic optimization. For the inter-domain scenario, where cross-domain business access is required, the network accommodates the transition from traditional MPLS VPN networks by adopting the Option A inter-domain approach. This method helps address synchronization issues during network upgrades and ensures a smooth transition across domains. The entire network is planned under a unified framework set by the power grid corporation, with clearly defined VPN categories across the network. Through segmented deployment of EVPN L3VPN over SRv6 Policy, each segment can be optimized for business traffic. 4. SRv6 Deployment Scenario in Power Grid 4.1. SRv6 Migration TBD Lu & Geng Expires 24 April 2025 [Page 6] Internet-Draft draft-lu-srv6ops-srv6-for-power-grid-00 October 2024 4.2. SRv6 Inter-domain TBD 4.3. SRv6 based Path Selection and Load balancing TBD 5. IANA Considerations This document makes no request of IANA. Note to RFC Editor: this section may be removed on publication as an RFC. 6. Security Considerations 7. Acknowledgements 8. Normative References [RFC2119] Bradner, S., "Key words for use in RFCs to Indicate Requirement Levels", BCP 14, RFC 2119, DOI 10.17487/RFC2119, March 1997, <https://www.rfc-editor.org/info/rfc2119>. Authors' Addresses Jiangang Lu China Southern Power Grid Company Limited Email: lujiangang@gddd.csg.cn Xuesong Geng Huawei Email: gengxuesong@huawei.com Lu & Geng Expires 24 April 2025 [Page 7]