ITU-T Y.1731 supports Performance Monitoring feature for Ethernet. Loss and Delay measurement can be achieved which can be significantly used to identify network problems before they impact. SLM is used to calculate the frame loss between endpoints using synthetic frames. Transmit and received counters at endpoints for received vs dropped are used to measure frame loss. CCM and LMM are used to calculate the frame loss of data traffic between endpoints. On CCM, loss measurement is encapsulated as part of CFM packets and it's dual ended. For LMM, separate loss measurement message and reply is shared on configured interval between endpoints to calculate the data frame loss. CCM and LMM service frames will have the counters which maintain a count of transmitted and received data frames between a pair of MEPs.Ethernet frame delay measurement provides fine control to operators for triggering delay measurement on a given service and can be used to monitor SLAs. Ethernet frame delay measure-ment also collects other useful information, such as worst and best case delays, average delay, and aver-age delay variation.