ZyXEL Communications ZyXEL Dimension GS-3012F - Manual (Page 215)

Dimension GS-3012F Gigabit Ethernet Switch
Command Examples 29-17
<auto|10-
half|10-
full|100-
half|100-
full|1000-
full>
Sets the duplex mode (half, full) and speed (10/100/1000 Mbps) of the
connection on the interface. Selecting auto (auto-negotiation) makes one port
able to negotiate with a peer automatically to obtain the connection speed
and duplex mode that both ends support.
An example is shown next.
Enable ports one, three, four and five for configuration.
Set the speed to 10 Mbps in half duplex mode.
Figure 29-34 speed-duplex Command Example
GS-3012F(config)# interface 1,3-5
GS-3012F(config-interface)# speed-duplex 10-half