Cisco Catalyst 3750 Metro

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Catalyst 3750 Metro Switch Command Reference

OL-9645-10

Chapter 2 Catalyst 3750 Metro Switch Cisco IOS Commands

mdix auto

Use the mdix auto interface configuration command to enable the automatic

medium-dependent-interface crossover (Auto-MDIX) feature on the interface. When Auto-MDIX is

enabled, the interface automatically detects the required cable connection type (straight-through or

crossover) and configures the connection appropriately. Use the no form of this command to disable

Auto-MDIX.

mdix auto

no mdix

Syntax Description This command has no arguments or keywords.

Defaults The default is Auto-MDIX is enabled.

Command Modes Interface configuration

Command History

Usage Guidelines When you enable Auto-MDIX on an interface, you must also set the interface speed and duplex to auto.

When Auto-MDIX (along with autonegotiation of speed and duplex) is enabled on one or both of

connected interfaces, link up occurs, even if the cable type (straight through or crossover) is incorrect.

Auto-MDIX is supported on all 10/100 interfaces and on 10/100/1000BASE-T/TX small form-factor

pluggable (SFP) module interfaces. It is not supported on 1000BASE-SX or -LX SFP module interfaces.

Caution ES ports do not support 10 or 100 Mbps operation. If a 1000BASE-T SFP module is inserted in an ES

module port, and you set the speed to auto to enable Auto-MDIX, be sure that the interface is connected

to a Gigabit interface. Setting the speed to auto can result in severe data loss if the interface is connected

to a 10/100 interface on another switch.

Examples This example shows how to enable Auto-MDIX on a port:

Switch# configure terminal

Switch(config)# interface fastethernet1/0/1

Switch(config-if)# speed auto

Switch(config-if)# duplex auto

Switch(config-if)# mdix auto

Switch(config-if)# end

You can verify the operational state of Auto-MDIX on the interface by entering the show controllers

ethernet-controller interface-id phy privileged EXEC command.

Release Modification

12.1(14)AX This command was introduced.

Cisco Catalyst 3750 Metro - MDIX Auto