1）IEEE 802.1ag 连通性故障管理(CFM:Connectivity Fault Management) 2）IEEE 802.3ah 第一英里的以太网(EFM:Ethernet in the First Mile)，其中第57章的以太网OAM 3）ITU-T Y.1731 以太网OAM（Operation, Administration and Maintenance）
This clause defines the Operations, Administration, and Maintenance (OAM) sublayer, which provides mechanisms useful for monitoring link operation such as remote fault indication and remote loopback control. In general, OAM provides network operator
IEEE Standard for Information technologyó Telecommunications and information exchange between systemsó Local and metropolitan area networksó Specific requirements
