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Software Configuration Guide—Release 15.0(2)SG
OL-23818-01
Chapter 6 Configuring Interfaces
Configuring Optional Interface Features
Note The following line cards support Auto-MDIX by default, when port auto-negotiation is enabled:
WS-X4424-GB-RJ45, WS-X4448-GB-RJ45,WS-X4548-GB-RJ45 and WS-X4412-2GB-T. You cannot
disable them with the mdix command.
Note The following line cards do not support Auto-MDIX, neither by default nor by CLI:
WS-X4548-GB-RJ45V, WS-X4524-GB-RJ45V, WS-X4506-GB-T,WS-X4148-RJ, WS-X4248-RJ21V,
WS-X4248-RJ45V, WS-X4224-RJ45V and WS-X4232-GB-RJ.
Note The following line cards support Auto-MDIX through the CLI on their copper media ports:
WS-X4124-RJ45, WS-X4148-RJ45 (hardware revision 3.0 or higher), and WS-X4232-GB-RJ45
(hardware revision 3.0, or higher), WS-X4920-GE-RJ45 and WS-4648-RJ45V+E (Auto-MDIX support
when inline power is disabled on the port).
Table 6-1 shows the link states that results from auto-MDIX settings and correct and incorrect cabling.
To configure auto-MDIX on a port, perform this task:
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 fastethernet 6/5
Switch(config-if)# speed auto
Switch(config-if)# mdix auto
Table 6-1 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
Switch# configure terminal
Enters global configuration mode
Step 2
Switch(config)# interface
interface-id
Enters interface configuration mode for the physical interface to be
configured.
Step 3
Switch(config-if)# speed auto
Configures the port to autonegotiate speed with the connected device.
Step 4
Switch(config-if)# mdix auto
Enables auto-MDIX on the port.
Step 5
Switch(config-if)# end
Returns to privileged EXEC mode.
Step 6
Switch# show interfaces
interface-id
Verifies the configuration of the auto-MDIX feature on the interface.
Step 7
Switch# copy running-config
startup-config
(Optional) Saves your entries in the configuration file.