Huawei Technologies,Co.,Ltd Huawei Huawei Technologies,Co.,Ltd Comcast China Unicom The data model defined in [RFC8345] introduces vertical layering relationships between networks that can be augmented to cover network/service topologies. This document defines a YANG model for Network and VPN Service Performance Monitoring that can be used to monitor and manage network performance on the topology at different layer or the overlay topology between VPN sites. This model is an augmentation to the network topology YANG data model defined in [RFC8345].