Indicates whether the MAC notification feature is currently
running in the device.
Setting this object to false(2) disables the MAC notification
feature globally thus disabling the feature at each interface.
Setting this object to true(1) will start the MAC notification
feature running in the device. If the feature is already
running, setting to true(1) has no effect. Once the MAC
notification is enabled, whether the feature is running at each
interface is controlled by the cmnIfConfigTable.