Cisco Catalyst 3560-X Command Reference Manual page 222

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

settings. If one interface supports autonegotiation and the other end does not, configure duplex and speed

on both interfaces; do use the auto setting on the supported side.

If the speed is set to auto, the switch negotiates with the device at the other end of the link for the speed

setting and then forces the speed setting to the negotiated value. The duplex setting remains as

configured on each end of the link, which could result in a duplex setting mismatch.

You can configure the duplex setting when the speed is set to auto.

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, see the "Configuring Interface

Characteristics" chapter in the software configuration guide for this release.

This example shows how to configure an interface for full-duplex operation:

Switch(config)# interface gigabitethernet1/0/1

Switch(config-if)# duplex full

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

show interfaces

Displays the interface settings on the switch.

Sets the speed on a 10/100 or 10/100/1000 Mb/s interface.

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