This read-write object, when set, clears CFM statistics globally across the entire switch, as explicitly stated in its description, acting as a bulk reset trigger rather than a normal readable counter. An admin uses this deliberately and sparingly, since it wipes accumulated CFM statistics switch-wide rather than for just one service, and would typically only be used after a major configuration change or maintenance event where historical stats are no longer meaningful and a clean baseline is wanted. For example, an admin setting cienaCesCfmGlobalStatsClear after completing a switch-wide CFM reconfiguration would reset every service's CCM loss history and defect counters at once, rather than having to clear each service individually.