An Ethernet service provider needs to demonstrate to his customer that the service he is providing is compliant with the service level agreement. A network installer needs to demonstrate the functionality of a newly turned-up Ethernet link. A network troubleshooter needs to resolve complaints about slow networks. Ethernet performance measurement can help.  Various metrics can quantify and characterize performance. Test plans can be written to satisfy varying organizational objectives.  This white paper will describe advancements in field measurement of end-to-end Ethernet performance.