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Catalyst4500 Series SwitchCiscoIOS Command Reference—Release 12.2(18)EW
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Chapter2 Cisco IOS Commands for the Catalyst 4500 Series Switches
duplex
If the transmission speed on a 16-port RJ-45 Gigabit Ethernet port is set to 1000, duplex mode is set to
full. If the transmission speed is changed to 10 or 100, the duplex mode stays at full. You must configure
the correct duplex mode on the switch when the transmission speed changes to 10 or 100 from 1000
Mbps.
Note Catalyst 4006 switches cannot automatically negotiate interface speed and duplex mode if either
connecting interface is configured to a value other than auto.
Caution Changing the interface speed and duplex mode configuration might shut down and reenable the interface
during the reconfiguration.
Table2-3 describes the system performance for different combinations of the duplex and speed modes.
The specified duplex command configured with the specified speed command produces the resulting
action shown in the table.
Examples This example shows how to configure the interface for full-duplex operation:
Switch(config-if)# duplex full
Switch(config-if)#
Related Commands speed
interface (refer to Cisco IOS documentation)
show controllers (refer to Cisco IOS documentation)
show interfaces (refer to Cisco IOS documentation)
Table2-3 Relationship Between duplex and speed Commands
duplex Command speed Command Resulting System Action
duplex half or duplex full speed auto Autonegotiates both speed and duplex modes
duplex half speed 10 Forces 10 Mbps and half duplex
duplex full speed 10 Forces 10 Mbps and full duplex
duplex half speed 100 Forces 100 Mbps and half duplex
duplex full speed 100 Forces 100 Mbps and full duplex
duplex full speed 1000 Forces 1000 Mbps and full duplex
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