Network Working Group S. Zhang Internet-Draft J. Li Intended status: Standards Track China Unicom Expires: 11 March 2023 C. Li X. Chen Huawei Technologies 7 September 2022 Use Cases for Computing-aware Software-Defined Wide Area Network(SD-WAN) draft-zhang-dyncast-computing-aware-sdwan-usecase-01 Abstract SD-WAN is aware of the computing power of applications deployed in the multiple sites of enterprise and can perform the routing policy according to such information. This is defined as the computing- aware SD-WAN.This document describes the use cases for computing- aware Software-Defined Wide Area Network(SD-WAN). 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 11 March 2023. Copyright Notice Copyright (c) 2022 IETF Trust and the persons identified as the document authors. All rights reserved. Zhang, et al. Expires 11 March 2023 [Page 1] Internet-Draft draft-XX-computing-aware-sd-wan-usecase- September 2022 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 of Computing-aware SD-WAN . . . . . . . . . . . . . 2 2.1. Computing-aware SD-WAN for Enterprise Cloudification . . 3 3. Security Considerations . . . . . . . . . . . . . . . . . . . 4 4. IANA Considerations . . . . . . . . . . . . . . . . . . . . . 4 5. Normative References . . . . . . . . . . . . . . . . . . . . 4 Authors' Addresses . . . . . . . . . . . . . . . . . . . . . . . 4 1. Introduction SD-WAN provides organizations or enterprises with centralized control over multiple sites which are network endpoints including branch offices, headquarters, data centers, clouds, and more. A enterprise may deploy their services and applications in different locations to achieve optimal performance. The traffic sent by a host will take the shortest WAN path to the closest server. However, the closet server MAY NOT be the best choice with lowest cost of network and computing resources for the host. If the path computation element can consider the computing dimension information in path computation, the best path with lowest cost can be provided. The computing related information can be the number of vCPUs of the VM running the application/services, CPU utilization rate, usage of memory, etc. The SD-WAN can be aware of the computing resource of applications deployed in the multiple sites and can perform the routing policy according to the information is defined as the computing-aware SD- WAN. This document describe the use case of computing-aware SD-WAN. 2. Use Cases of Computing-aware SD-WAN Zhang, et al. Expires 11 March 2023 [Page 2] Internet-Draft draft-XX-computing-aware-sd-wan-usecase- September 2022 2.1. Computing-aware SD-WAN for Enterprise Cloudification Many enterprises are performing the cloud migration to migrate the applications from data centers to the clouds, including public, private, and hybrid clouds. The clouds resources can be from the same provider or multiple cloud providers which have some benefits including disaster recovery, load balancing, avoiding vendor lock-in. In such cloudification deployments SD-WAN provides enterprises with centralized control over Customer-Premises Equipments(CPEs) in branch offices and the cloudified CPEs(vCPEs) in the clouds.The CPEs connect the clients in branch offices and the application servers in clouds. The same application server in different clouds is called an application instance. Different application instances have different computing resource. SD-WAN is aware of the computing resource of applications deployed in the clouds by vCPEs, and selects the application instance for the client to visit according to computing power and the network state of WAN. Figure 1 below illustrates Computing-aware SD-WAN for Enterprise Cloudification. +---------------+ +-------+ +----------+ | Cloud1 | |Client1| /---------| WAN1 |------| vCPE1 APP1 | +-------+ / +----------+ +---------------+ +-------+ +-------+ |Client2| ------ | CPE | +-------+ +-------+ +---------------+ +-------+ \ +----------+ | Cloud2 | |Client3| \---------| WAN2 |------| vCPE2 APP1 | +-------+ +----------+ +---------------+ Figure 1: Illustration of Computing-aware SD-WAN for Enterprise Cloudification The current computing load status of the application APP1 in cloud1 and cloud2 is as follows: each application uses 6 vCPUs. The load of application in cloud1 is 50%. The load of application in cloud2 is 20%. The computing resource of APP1 are collected by vCPE1 and vCPE2 respectively. Client1 and Client2 are visiting APP1 in cloud1. WAN1 and WAN2 have the same network states. Considering lightly loaded application SD-WAN selects APP1 in cloud2 for the client3 in branch office. The traffic of client3 follows the path: Client3 -> CPE -> WAN1 -> Cloud2 vCPE1 -> Cloud2 APP1 Zhang, et al. Expires 11 March 2023 [Page 3] Internet-Draft draft-XX-computing-aware-sd-wan-usecase- September 2022 3. Security Considerations TBD 4. IANA Considerations There are no IANA considerations in this document. 5. 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, . Authors' Addresses Shuai Zhang China Unicom Beijing China Email: zhangs366@chinaunicom.cn Jianfe Li China Unicom Beijing China Email: lijf299@chinaunicom.cn Cheng Li Huawei Technologies Beijing China Email: c.l@huawei.com Xia Chen Huawei Technologies Beijing China Email: jescia.chenxia@huawei.com Zhang, et al. Expires 11 March 2023 [Page 4]