TEAS L. M. Contreras Internet-Draft Telefonica Intended status: Informational X. Liu Expires: 4 September 2025 Alef Edge 3 March 2025 DC aware TE topology model draft-llc-teas-dc-aware-topo-model-04 Abstract This document proposes the extension of the TE topology model for including information related to data center resource capabilities. 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 4 September 2025. Copyright Notice Copyright (c) 2025 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. Contreras & Liu Expires 4 September 2025 [Page 1] Internet-Draft DC TE Topo March 2025 Table of Contents 1. Introduction . . . . . . . . . . . . . . . . . . . . . . . . 2 2. Datacenter information . . . . . . . . . . . . . . . . . . . 2 3. Model structure . . . . . . . . . . . . . . . . . . . . . . . 3 3.1. Hypervisor-based cloud solutions . . . . . . . . . . . . 3 3.2. Container-based cloud solutions . . . . . . . . . . . . . 4 4. Security and operational considerations . . . . . . . . . . . 5 5. Informative References . . . . . . . . . . . . . . . . . . . 5 Acknowledgements . . . . . . . . . . . . . . . . . . . . . . . . 6 Authors' Addresses . . . . . . . . . . . . . . . . . . . . . . . 6 1. Introduction More and more service providers are deploying cloud computing facilities in order to host different kinds of services and applications. Such facilities can be generally referred as Datacenter Points of Presence (DC-PoPs). Those DCs will consist of a number of servers and networking elements for connecting all of them with the transport network. Depending on the number of servers in the data center, there will be distinct capabilities in terms of CPUs, memory and storage available for deploying and running the aforementioned services. In such distributed and interconnected DC-PoPs, both computing and topological information are of interest for determining the optimal DC where to deploy a given service or application. This document proposes a DC-aware extension for the topology model. 2. Datacenter information The relevant information for datacenter capabilities can be described in different ways. One potential manner is to describe resource capabilities such as CPU, memory, storage, etc. This can be done in terms of total, used and free capacity for each of the parameters of interest. Cloud management systems allow to obtain such kind of information. For instance, in the case of Kubernetes it is possible to retrieve information about the total and allocatable resources in a compute node. Alternatively, in the case of OpenStack it is possible to collect information about the total resources and those currently in use from such total. Another form of populating the information is by describing those resource capabilities as a bundled, usually referred as quota or flavor. Well known cloud computing providers like Amazon Web Services, Microsoft Azure or Google Cloud Platform follow such schema, bundling CPU, RAM and storage units as flavors. In the case Contreras & Liu Expires 4 September 2025 [Page 2] Internet-Draft DC TE Topo March 2025 of Amazon Web Services the bundle is known as “instance type”, while in Microsoft Azure is termed “virtual machine size” and in Google Cloud Platform it is called “machine type”. Additional information to consider in both cases could refer to the management capabilities of the compute infrastructure, such as hypervisor details or virtualization technologies available. The recent trend of cloud-native approach for the instantiation and deployment of service functions has positioned Kubernetes as the de- facto standard to manage containerized software in data centers, but it is also increasingly being used by telecommunication operators to manage compute resources at the edge. Finally, all can be complemented with information related to the networking details for reaching the aforementioned compute capabilities (IP addresses, bandwidth, etc). 3. Model structure According to the distinct approaches for managing cloud-based resources different options could exist. 3.1. Hypervisor-based cloud solutions A model structure for hypervisor-based cloud solutions (e.g., OpenStack) can be described in the following manner. Contreras & Liu Expires 4 September 2025 [Page 3] Internet-Draft DC TE Topo March 2025 module: ietf-openstack-info +--rw dcpop +--rw dcpop-id? string +--rw dc* [id] +--rw openstack +--rw compute-nodes | +--rw node* [name] | +--rw name string | +--rw vcpus | | +--rw total uint64 | | +--rw allocated uint64 | | +--rw used uint64 | +--rw memory | | +--rw total uint64 | | +--rw allocated uint64 | | +--rw used uint64 | +--rw instances | +--rw max-instances uint32 | +--rw running uint32 +--rw instances +--rw instance* [id] +--rw id string +--rw name string +--rw project-id string +--rw vcpus | +--rw allocated uint64 | +--rw limit uint64 | +--rw used uint64 +--rw memory | +--rw allocated uint64 | +--rw limit uint64 | +--rw used uint64 +--rw status +--rw state enumeration +--rw conditions* string 3.2. Container-based cloud solutions A model structure for container-based cloud solutions (e.g., Kubernetes) can be described in the following manner. Contreras & Liu Expires 4 September 2025 [Page 4] Internet-Draft DC TE Topo March 2025 module: ietf-kubernetes-info +--rw dcpop +--rw dcpop-id? string +--rw dc* [id] +--rw kubernetes +--rw nodes | +--rw node* [id] | +--rw name string | +--rw cpu | | +--rw capacity uint64 | | +--rw allocatable uint64 | | +--rw usage uint64 | +--rw memory | | +--rw capacity uint64 | | +--rw allocatable uint64 | | +--rw usage uint64 | +--rw pods | +--rw max-pods uint32 | +--rw running-pods uint32 +--rw pods +--rw pod* [id] +--rw namespace string +--rw name string +--rw cpu | +--rw request uint64 | +--rw limit uint64 | +--rw usage uint64 +--rw memory | +--rw request uint64 | +--rw limit uint64 | +--rw usage uint64 +--rw status +--rw phase enumeration +--rw conditions* string 4. Security and operational considerations The data-model in this document does not have any security implications. The model is designed to be accessed via NETCONF [RFC6241], thus the security considerations for the NETCONF protocol are applicable here. 5. Informative References [RFC6241] Enns, R., Ed., Bjorklund, M., Ed., Schoenwaelder, J., Ed., and A. Bierman, Ed., "Network Configuration Protocol (NETCONF)", RFC 6241, DOI 10.17487/RFC6241, June 2011, . Contreras & Liu Expires 4 September 2025 [Page 5] Internet-Draft DC TE Topo March 2025 Acknowledgements The work of L.M. Contreras has been partially funded by the European Union under the Horizon Europe projects NEMO (NExt generation Meta Operating system) grant number 101070118, and CODECO (COgnitive, Decentralised Edge-Cloud Orchestration), grant number 101092696. Young Lee contributed to initial versions of this draft. Authors' Addresses Luis M. Contreras Telefonica Ronda de la Comunicacion, s/n 28050 Madrid Spain Email: luismiguel.contrerasmurillo@telefonica.com URI: http://lmcontreras.com Xufeng Liu Alef Edge Email: xufeng.liu.ietf@gmail.com Contreras & Liu Expires 4 September 2025 [Page 6]