Cisco Cisco Google Juniper Huawei This document specifies the requirements and reference framework for Ethernet VPN (EVPN) Operations, Administration and Maintenance (OAM). The requirements cover the OAM aspects of EVPN and PBB-EVPN. The framework defines the layered OAM model encompassing the EVPN service layer, network layer and underlying Packet Switched Network (PSN) transport layer.