Remote Loopback
An OAM entity can put its remote entity into loopback mode using a loopback control OAMPDU. This helps you ensure quality of links during installation or when troubleshooting. In loopback mode, each frame received is transmitted back on that same port except for OAMPDUs and pause frames. The periodic exchange of OAMPDUs must continue while in the loopback state to maintain the OAM session. The loopback command is acknowledged by responding with an information OAMPDU with the loopback state indicated in the state field.