CHAPTER 3
Configuring Auto-MDIX
•
Prerequisites for Auto-MDIX, page 43
•
Restrictions for Auto-MDIX, page 43
•
Information about Configuring Auto-MDIX, page 44
•
How to Configure Auto-MDIX, page 44
•
Monitoring Auto-MDIX, page 45
•
Example for Configuring Auto-MDIX, page 46
•
Feature History and Information for Auto-MDIX, page 46
Prerequisites for Auto-MDIX
To configure Layer 2 parameters, if the interface is in Layer 3 mode, you must enter the switchport interface
configuration command without any parameters to put the interface into Layer 2 mode. This shuts down the
interface and then re-enables it, which might generate messages on the device to which the interface is
connected. When you put an interface that is in Layer 3 mode into Layer 2 mode, the previous configuration
information related to the affected interface might be lost, and the interface is returned to its default
configuration.
Automatic medium-dependent interface crossover (auto-MDIX) is enabled by default. When you enable
auto-MDIX, you must also set the interface speed and duplex to auto so that the feature operates correctly.
Auto-MDIX is supported on all 10/100/1000-Mb/s and on 10/100/1000BASE-TX small form-factor pluggable
(SFP)-module interfaces. It is not supported on 1000BASE-SX or -LX SFP module interfaces.
Restrictions for Auto-MDIX
The switch might not support a pre-standard powered device—such as Cisco IP phones and access points that
do not fully support IEEE 802.3af—if that powered device is connected to the switch through a crossover
cable. This is regardless of whether auto-MIDX is enabled on the switch port.
Catalyst 2960-XR Switch Interface and Hardware Component Configuration Guide, Cisco IOS Release 15.0(2)EX1
OL-29420-01 43
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