Cisco Catalyst 3750 Command Reference Manual page 573

Hide thumbs Also See for Catalyst 3750:

Table of Contents

Chapter 2 Catalyst 3750 Switch Cisco IOS Commands

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.

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, see 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

This example shows how to set a port to autonegotiate at only 10 Mbps:

Switch(config)# interface gigabitethernet1/0/1

Switch(config-if)# speed auto 10

This example shows how to set a port to autonegotiate at only 10 or 1000 Mbps:

Switch(config)# interface gigabitethernet1/0/1

Switch(config-if)# speed auto 10 100

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

Related Commands

show interfaces

Specifies the duplex mode of operation.

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

Catalyst 3750 Switch Command Reference