About Ethernet OAM remote loopback

When you enable Ethernet OAM remote loopback on a port, the port sends Loopback Control OAMPDUs to a remote port. After receiving the Loopback Control OAMPDUs, the remote port enters the loopback state. The remote port then returns any packets sent from the local port except OAMPDUs. By observing how many of these packets return, you can calculate the packet loss ratio on the link and evaluate the link performance.