srv6ops T. He, Ed. Internet-Draft X. Yi, Ed. Intended status: Informational China Unicom Expires: 20 April 2025 17 October 2024 Use Cases and Requirements for Service Function Chaining based on SRv6 in cloud. draft-hy-srv6ops-sfc-in-cloud-uc-00 Abstract This document outlines the usecase for implementing Service Function Chaining(SFC) based on SRv6 in cloud, motivated by the increasing demand for collabration between cloud and network. The capabilities of SRv6 in most cloud service are not ready, such as SFC based on SRv6. If we want to realize these capabilities of SRv6 end-to-end, virtual routers(VR) can be deployed as an agent which support SRv6 in the cloud. 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 20 April 2025. Copyright Notice Copyright (c) 2024 IETF Trust and the persons identified as the document authors. All rights reserved. He & Yi Expires 20 April 2025 [Page 1] Internet-Draft Service Function Chaining based on SRv6 October 2024 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. 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. Use cases and scheme . . . . . . . . . . . . . . . . . . . . 2 2.1. SFC based on SRv6 . . . . . . . . . . . . . . . . . . . . 2 3. Conclusion . . . . . . . . . . . . . . . . . . . . . . . . . 4 4. Security Considerations . . . . . . . . . . . . . . . . . . . 4 5. IANA Considerations . . . . . . . . . . . . . . . . . . . . . 4 Acknowledgements . . . . . . . . . . . . . . . . . . . . . . . . 4 Contributors . . . . . . . . . . . . . . . . . . . . . . . . . . 4 Authors' Addresses . . . . . . . . . . . . . . . . . . . . . . . 4 1. Introduction With the rapid development of IPv6 and IPv6 extention protocol, the carrier network has basically completed the deployment of them. However, in most clouds, IPv4 protocol is still used, and IPv6,especially IPv6 extention protocol have not been achieved to end-to-end deployment. In order to promote capabilities of IPv6 and IPv6 enhancement into the network end-to-end，such as the capability of SFC based on SRv6, we should upgrade the according device and system in the cloud. But considering the upgrading of network hardware devices and business systems in the cloud will take a long time and cost a lot, we propose a scheme to deploy a VR in the cloud to support SRv6 and act as an agent for the application in the cloud, so that it can realize the end-to-end SFC based on SRv6. 2. Use cases and scheme 2.1. SFC based on SRv6 Nowadays, operators are actively evolving from traditional communication service providers to integrated information service enterprises. Operators need to organize a large number of value- added services in the cloud such as security service product to meet the security requirements of enterprises on the enterprise private line. We can use SFC to achieve this capability and the security service can be added and deleted on SFC easily. At present, SRv6 capability is the best choice for SFC on the enterprise private line, He & Yi Expires 20 April 2025 [Page 2] Internet-Draft Service Function Chaining based on SRv6 October 2024 but various security services can not support the capability of SRv6 in the cloud, so we need to use a device as SRv6 agent and interact with security services. Traditionally, we use a router in the carrier network as the SRv6 agent to achieve it. However in this scenario, accompany with the increase of the security services, the flow between cloud and carrier network multiply. As shown in the Figure 1. (~~~~~~~~~~~~~~~~~~~~~~~~~) ( Cloud1 ) ( +--------+ +--------+ ) ( |Service1| |Service2| ) ( +--------+ +--------+ ) ( * * ) (~~~~~~*~~~~~~~~~~~*~~~~~~) * | * * | * * | * +--------+ | Router | +--------+ Figure 1 And moreover, considering the time and ecomomic costs, we have adopted a more flexible approach.In Chinaunicom's network, we deploy VR in the cloud as SRv6 agents of security services, so that we can decrease the flow between cloud and carrier network, and it can be deployed simply and flexibly. As shown in the Figure 2. He & Yi Expires 20 April 2025 [Page 3] Internet-Draft Service Function Chaining based on SRv6 October 2024 (~~~~~~~~~~~~~~~~~~~~~~~~~) ( Cloud1 ) ( +--------+ +--------+ ) ( |Service1| |Service2| ) ( +--------+ +--------+ ) ( \ / ) ( \ / ) ( +---------+ ) ( | VR | ) ( +---------+ ) (~~~~~~~~~~~~~~~~~~~~~~~~~) | | | +--------+ | Router | +--------+ Figure 2 3. Conclusion Generally, in order to introduce SRv6 capability into the cloud, realize the end-to-end capability of SFC based on SRv6, we use VR to bring quick and flexible update, which benefits the business with fast evolution. 4. Security Considerations TBD. 5. IANA Considerations TBD. Acknowledgements TBD. Contributors TBD. Authors' Addresses He & Yi Expires 20 April 2025 [Page 4] Internet-Draft Service Function Chaining based on SRv6 October 2024 Tao He (editor) China Unicom Beijing China Email: het21@chinaunicom.cn Xinxin Yi (editor) China Unicom Beijing China Email: yixx3@chinaunicom.cn He & Yi Expires 20 April 2025 [Page 5]