This read-write CmControlProtocolDispType object sets the Control Protocol Disposition specifically for IEEE 802.3ah EFM OAM frames, identified by MAC address 01:80:C2:00:00:03, Ethertype 0x8809, and subtype 03, on an Ethernet Access Port. Admins configure this to control whether EFM OAM frames (used for the fault-signaling and loopback features documented elsewhere in this MIB) are allowed to pass across this specific access port, distinct from the Marker protocol sharing the same MAC/Ethertype but a different subtype. For example, if a customer's own equipment should not be able to exchange EFM OAM frames with the carrier's network on a given access port, an admin would set cmEthernetAccPortCpdV2EfmOamDispType to drop so those OAMPDUs are filtered out at that port.