The clock ethernet-synchronization enable command enables synchronous Ethernet.
The undo clock ethernet-synchronization enable command disables synchronous Ethernet.
By default, synchronous Ethernet is not enabled.
To enable synchronous Ethernet, run the clock ethernet-synchronization enable command. After synchronous Ethernet is enabled on a switch, the switch selects the clock signal sent through Ethernet interfaces as the clock source.
The synchronous Ethernet function of an interface needs to be enabled both globally and on this interface. If the global synchronous Ethernet configuration is disabled, the synchronous Ethernet configuration on the interface is not deleted, but this function becomes unavailable.