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Catalyst 3750-X and 3560-X Switch Software Configuration Guide
OL-25303-03
Chapter 1 Configuring Interface Characteristics
Configuring Ethernet Interfaces
Table 1-4 shows the link states that result from auto-MDIX settings and correct and incorrect cabling.
To configure auto-MDIX on an interface, follow these steps beginning in privileged EXEC mode:
To disable auto-MDIX, use the no mdix auto interface configuration command.
This example shows how to enable auto-MDIX on a port:
Switch# configure terminal
Switch(config)# interface gigabitethernet1/0/1
Switch(config-if)# speed auto
Switch(config-if)# duplex auto
Switch(config-if)# mdix auto
Switch(config-if)# end
Configuring a Power Management Mode on a PoE Port
For most situations, the default configuration (auto mode) works well, providing plug-and-play
operation. No further configuration is required. However, use the following procedure to give a PoE port
higher priority, to make it data only, or to specify a maximum wattage to disallow high-power powered
devices on a port.
Catalyst 3750-X switches also support StackPower, which allows switch power supplies to share the load
across multiple systems in a stack by connecting up to four switches with power stack cables. See
Chapter 1, “Configuring Catalyst 3750-X StackPower” for information on StackPower.
Table 1-4 Link Conditions and Auto-MDIX Settings
Local Side Auto-MDIX Remote Side Auto-MDIX With Correct Cabling With Incorrect Cabling
On On Link up Link up
On Off Link up Link up
Off On Link up Link up
Off Off Link up Link down
Command Purpose
Step 1
configure terminal Enters global configuration mode
Step 2
interface interface-id Specifies the physical interface to be configured, and enter interface
configuration mode.
Step 3
speed auto Configures the interface to autonegotiate speed with the connected device.
Step 4
duplex auto Configures the interface to autonegotiate duplex mode with the connected
device.
Step 5
end Returns to privileged EXEC mode.
Step 6
show controllers ethernet-controller
interface-id phy
Verifies the operational state of the auto-MDIX feature on the interface.
Step 7
copy running-config startup-config (Optional) Saves your entries in the configuration file.
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