cats J. Wang Internet-Draft China Mobile Intended status: Informational 21 October 2024 Expires: 24 April 2025 A Use case for Green Computing-Aware Traffic Steering draft-wang-cats-usecase-green-00 Abstract This draft describes a compute-aware use case for services with green energy requirements. This use case considers both network, computation and energy metrics when selecting a service instance. 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. 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. Wang Expires 24 April 2025 [Page 1] Internet-Draft A Use case for Green Computing-Aware Tra October 2024 Table of Contents 1. Introduction . . . . . . . . . . . . . . . . . . . . . . . . 2 2. Definition of Terms . . . . . . . . . . . . . . . . . . . . . 2 3. Use Case . . . . . . . . . . . . . . . . . . . . . . . . . . 3 3.1. Distributed Model . . . . . . . . . . . . . . . . . . . . 3 3.2. Centralized Model . . . . . . . . . . . . . . . . . . . . 4 4. Conclusion . . . . . . . . . . . . . . . . . . . . . . . . . 5 5. Security Considerations . . . . . . . . . . . . . . . . . . . 6 6. IANA Considerations . . . . . . . . . . . . . . . . . . . . . 6 7. Informative References . . . . . . . . . . . . . . . . . . . 6 Author's Address . . . . . . . . . . . . . . . . . . . . . . . . 6 1. Introduction As mobile edge computing networks sink computational tasks from cloud data centers to the edge of the network, tasks need to be processed by computational resources close to the user's end as mentioned in [I-D.ietf-cats-usecases-requirements]. Therefore, CATS is proposed. Reducing carbon emissions is a major challenge that needs to be faced in our time. The network is the main enabler to achieve the reduction of carbon emission.The introduction of computational dimension in CATS makes the previous energy saving by considering only the network dimension to be insufficient and hence green for CATS based on the association of network and computation is worth to be explored. Recently, the GREEN WG was formed. It is chartered to explore use cases, derive requirements, and provide solutions for identifying and characterizing energy efficiency metrics, methods related to energy consumption of network devices, and optimizing energy efficiency across the network. network. There are also a number of contributions that explore green networks, and the document [I-D.wang-cats-green-challenges] summarizes a number of challenges faced by cats considering green. This document provides a green cats use case. 2. Definition of Terms Computing-Aware Traffic Steering (CATS): Aiming at computing and network resource optimization by steering traffic to appropriate computing resources considering not only routing metric but also computing resource metric. Service: A monolithic functionality that is provided by an endpoint according to the specification for said service. A composite service can be built by orchestrating monolithic services. Wang Expires 24 April 2025 [Page 2] Internet-Draft A Use case for Green Computing-Aware Tra October 2024 Service instance: Running environment (e.g., a node) that makes the functionality of a service available. One service can have several instances running at different network locations. 3. Use Case Geared towards green computing-aware traffics Steering, the green metrics include the energy consumption of network devices as well as the energy consumption of computing resources. The following describes how green metrics are distributed under both distributed and centralized models. 3.1. Distributed Model Figure 1 shows an example of how Green CATS metrics can be disseminated in the distributed model. In this way, green metrics are distributed among network devices directly using distributed protocols without interactions with a centralized control plane. Wang Expires 24 April 2025 [Page 3] Internet-Draft A Use case for Green Computing-Aware Tra October 2024 Service CS-ID 1, contact instance CSCI-ID 1 Service CS-ID 1, contact instance CSCI-ID 2 :<----------------------: : : +---------+ : : |CS-ID 1 | : : +--|CSCI-ID 1| : +----------------+ | +---------+ : | C-SMA |----| Service Site 2 : +----------------+ | +---------+ : |CATS-Forwarder 2| +--|CS-ID 1 | : +----------------+ |CSCI-ID 2| +--------+ : | +---------+ | Client | : Network +----------------------+ +--------+ : metrics | +-------+ | | : :<---------| C-NMA | | | : Green | +-------+ | | : metrics | | +---------------------+ | | |CATS-Forwarder 1|C-PS|----| | +---------------------+ | Underlay | : | Infrastructure | +---------+ : | | |CS-ID 1 | : +----------------------+ +---|CSCI-ID 3| : | | +---------+ : +----------------+ +-------+ : |CATS-Forwarder 3|--| C-SMA | Service Site 3 : +----------------+ +-------+ : : | +-------+ : : +---|CS-ID 2| : : +-------+ :<-------------------------------: Service CS-ID 1, contact instance CSCI-ID 3 Service CS-ID 2, Figure 1: An Example of Green CATS Metric Dessimination in a Distributed Model 3.2. Centralized Model In Figure 2, network metrics, computing metrics, and green metrics can be distributed in a centralized way. Green metrics are collected by the centralized control plane, and then the centralized control plane calculates the forwarding path corresponding to the energy efficiency demand request and synchronizes with the Ingress CATS- Forwarder. Wang Expires 24 April 2025 [Page 4] Internet-Draft A Use case for Green Computing-Aware Tra October 2024 Service CS-ID 1, instance CSCI-ID 1 Service CS-ID 1, instance CSCI-ID 2 Service CS-ID 1, instance CSCI-ID 3 Service CS-ID 2, : +------+ :<------| C-PS |<-----------------------------------+ : +------+ <------+ +---------+ | : ^ | +--|CS-ID 1 | | : | | | |CSCI-ID 1| | : | +----------------+ | +---------+ | : | | C-SMA |---|Service Site 2 | : | +----------------+ | +---------+ | : | |CATS-Forwarder 2| +--|CS-ID 1 | | : | +----------------+ |CSCI-ID 2| | +--------+ : | | +---------+ | | Client | : Network | +----------------------+ | +--------+ : metrics | | +-------+ | | | : +-----| C-NMA | | +-----+ | : Green | | +-------+ | |C-SMA|<-+ | metrics | | | +-----+ | +----------------+ <---+ | | | |CATS-Forwarder 1|---------| | ^ | +----------------+ | Underlay | | | : | Infrastructure | +---------+| : | | |CS-ID 1 || : +----------------------+ +-|CSCI-ID 3|| : | | +---------+| : +----------------+------------+ | : |CATS-Forwarder 3| Service Site 3 | : +----------------+ | : | : +-------+ | : +-------:------|CS-ID 2|-----+ : : +-------+ :<-------------------------------: Service CS-ID 1, contact instance CSCI-ID 3 Service CS-ID 2 Figure 2: An Example of Green CATS Metric Distribution in a Centralized Model 4. Conclusion This document gives a CATS use case related to green and further describes how green metrics can be distributed under both distributed and centralized models. Wang Expires 24 April 2025 [Page 5] Internet-Draft A Use case for Green Computing-Aware Tra October 2024 5. Security Considerations TBD. 6. IANA Considerations TBD. 7. Informative References [I-D.ietf-cats-usecases-requirements] Yao, K., Contreras, L. M., Shi, H., Zhang, S., and Q. An, "Computing-Aware Traffic Steering (CATS) Problem Statement, Use Cases, and Requirements", Work in Progress, Internet-Draft, draft-ietf-cats-usecases-requirements-04, 3 July 2024, . [I-D.wang-cats-green-challenges] Wang, J., Fu, Y., and C. Li, "Green Challenges in Computing-Aware Traffic Steering (CATS)", Work in Progress, Internet-Draft, draft-wang-cats-green- challenges-04, 7 July 2024, . Author's Address Jing Wang China Mobile No.32 XuanWuMen West Street Beijing 100053 China Email: wangjingjc@chinamobile.com Wang Expires 24 April 2025 [Page 6]