CARRIER ETHERNET OPERATIONS, ADMINISTRATION & MAINTENANCE

The MEF OAM work has been focused on Service OAM or SOAM, the higher level OAM that travels between carriers along the path of the Ethernet Virtual Connection (EVC).

This OAM has been an important enabler for SLA monitoring and evolving Ethernet from a “best effort” service to true “Carrier Ethernet” which can support Service Level Agreements (SLAs) and the high availability necessary for mission critical applications. SOAM is based on the IEEE 802.1ag connectivity fault management (CFM) standard which provides fault visibility and allows the network to be partitioned into maintenance regions. Building on this, ITU Y.1731 standard provides end to end performance monitoring which enables measurement of SLA conformance. SOAM builds on top of a foundation of Link OAM which can provide simple OAM on a hop by hop basis.

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The diagram below provides a list of the key Ethernet OAM standards.
The MEF standards can be found by clicking on them.

Standards Body	Ethernet OAM
	802.3 clause 57 – Ethernet in the First Mile 802.1ag – Connectivity Fault Management 802.1aj – Two Port MAC Relay 802.1ap – MIB Definitions for VLAN bridges 802.1q/802.1ad – VLANs & Provider Bridging
	MEF 7.1 – EMS-NMS Info Model MEF 13 – UNI-Type 1 MEF 15 – NE Management Req MEF 16 - Ethernet Local Mgmt Interface MEF 17 – OAM Req & Framework MEF 20 – UNI-Type 2 Service OAM – Performance Monitoring/Fault Management Service OAM MIBs - Performance Monitoring/Fault Management NID Specification

	Y.1730/Y.1731 – Ethernet OAM Req & Mechanisms G.8031/G.8032 – Ethernet Protection Y.1563 – Performance and Availability Y.156SAM – Service Activation Methodology
	RFC 2544 – Benchmarking Method for Ntwk Interconnect Dev RFC 2819 – Remote Monitoring (RMON Etherstats)
	TMF814 – EMS to NMS Model (Corba) TMF854 – EMS to NMS (Web services - MTOSI)