Cisco Catalyst 2960 Series, Configuration Manual

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C H A P T E R
3
Configuring Auto-MDIX
• Prerequisites for Auto-MDIX, page 45
• Restrictions for Auto-MDIX, page 45
• Information about Configuring Auto-MDIX, page 45
• How to Configure Auto-MDIX, page 46
• Example for Configuring Auto-MDIX, page 47
• Additional References, page 48
• Feature History and Information for Auto-MDIX, page 48
Prerequisites for Auto-MDIX
Automatic medium-dependent interface crossover (auto-MDIX) is enabled by default.
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.
Information about Configuring Auto-MDIX
Auto-MDIX on an Interface
When automatic medium-dependent interface crossover (auto-MDIX) is enabled on an interface, the interface
automatically detects the required cable connection type (straight through or crossover) and configures the
connection appropriately. When connecting switches without the auto-MDIX feature, you must use
straight-through cables to connect to devices such as servers, workstations, or routers and crossover cables
Consolidated Platform Configuration Guide, Cisco IOS Release 15.2(4)E (Catalyst 2960-X Switches)
45