This reports the MAC address actually received on the given local service and MEP ID, capturing the source MAC address seen in CCM traffic associated with this local MEP rather than a configured or static address. An admin uses this to verify that CCM traffic for this MEP is arriving from the MAC address expected for its known remote peer, which helps detect a spoofed or unexpected source injecting CCMs into the maintenance association. For example, cienaCesCfmMEPMacAddr suddenly changing to an unfamiliar MAC address for a MEP that previously always showed a consistent peer address would prompt the admin to investigate a possible unauthorized device or an unplanned topology change.