Cisco Switch Auto-MDIX

S1(config-if)# speed auto

Configure the interface to automatically negotiate speed with the connected device.

S1(config-if)# duplex auto

Configure the interface to automatically negotiate the duplex mode with the connected device.

S1(config-if)# mdix auto

Enable auto-MDIX on the interface.

S1# config t

Enter global configuration mode.

S1(config)# interface fastethernet 0/1

Enter interface configuration mode.

S1(config)# end

Return to privileged exec mode.

S1# copy running-config startup-config

Save the running config file to the startup config.