Orange Juniper Nokia Telefonica This document defines a YANG data model, referred to as the "AC Glue" model, to augment the Layer 2/3 Service Model (LxSM) and Layer 2/3 Network Model (LxNM) with references to attachment circuits (ACs). The AC Glue model enables a provider to associate Layer 2/3 VPN services (LxVPNs) with the underlying AC infrastructure, thereby facilitating consistent provisioning and management of new or existing ACs in conjunction with LxVPN services. Specifically, by introducing an integrated approach to AC and LxVPN management, this model supports Attachment Circuit-as-a-Service (ACaaS) and provides a standardized mechanism for aligning AC/VPN requests with the network configurations required to deliver them.