Cisco Catalyst 3750 Command Reference Manual page 488

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If both ends of the line support autonegotiation, we highly recommend the default autonegotiation

settings. If one interface supports autonegotiation and the other end does not, do use the auto setting on

the supported side, but set the duplex and speed on both interfaces.

Changing the interface speed and duplex mode configuration might shut down and re-enable the

interface during the reconfiguration.

For guidelines on setting the switch speed and duplex parameters, refer to the software configuration

guide for this release.

This example shows how to set speed on a port to 100 Mbps:

Switch(config)# interface gigabitethernet1/0/1

Switch(config-if)# speed 100

You can verify your settings by entering the show interfaces privileged EXEC command.

Related Commands

show interfaces

Catalyst 3750 Switch Command Reference

Specifies the duplex mode of operation for Fast Ethernet and Gigabit

Ethernet ports.

Displays the statistical information specific to all interfaces or to a specific

Chapter 2 Catalyst 3750 Switch Cisco IOS Commands

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