Note
This command does not apply to all hardware platforms.
default duplex [port {slot/port[/sub-port][-slot/port[/sub-port]][,...]}]
duplex [port {slot/port[/sub-port][-slot/port[/sub-port]][,...]}]<half|full>
Identifies the slot and port in one of the following formats: a single slot and port (slot/port), a range of slots and ports (slot/port-slot/port), or a series of slots and ports (slot/port,slot/port,slot/port). If the platform supports channelization and the port is channelized, you must also specify the sub-port in the format slot/port/sub-port.
The default is half-duplex mode.
mgmtEthernet Interface Configuration