Specifications

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Catalyst 4500 Series Switch Cisco IOS Command Reference—Release IOS XE 3.3.0XO(15.1(1)XO)

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Chapter 2 Cisco IOS Commands for the Catalyst 4500 Series Switches

mdix auto

To enable the automatic medium-dependent interface crossover (auto-MDIX) feature on the interface,

use the mdix auto command. When auto-MDIX is enabled, the interface automatically detects the

required cable connection type (straight-thro ugh or crossover) and config ures the connection

appropriately. Use the no form of this command to disable auto-MDIX.

mdix auto

no mdix auto

Syntax Description This command has no arguments or keywo rds.

Defaults A uto-MDIX is enabled.

Command Modes Interface configuration mode

Usage Guidelines T he following linecards support Auto-MDIX through the CLI on their copper media ports:

WS-X4124-RJ45, WS- X4148-RJ4 5 (hard ware revis ion 3.0 or hi gher), a nd WS -X4232-GB-R J45

(hardware revision 3.0, or higher ), WS-X4920- GE-RJ45, a nd WS-46 48-RJ45V+E (Au to-MDIX supp ort

when inline power is disabled on the port).

Linecards that s upport aut o-MDIX by defaul t when po rt auto -negotiati on enable d and c annot be turned

off using an mdix CLI comma nd include: WS-X4448 -GB-RJ45, WS-X454 8-GB-RJ45,

WS-X4424-GB-RJ45, and WS-X4412-2GB-T.

Linecards that cannot su pport a uto-MDIX functi onality, either by default or CLI commands, include:

WS-X4548-GB-RJ45V, WS-X4524-G B-RJ45V, WS-X4506-GB-T, WS-X4148- RJ, WS-X4248-RJ21V,

WS-X4248-RJ45V, WS-X4224-RJ4 5V, and WS-X4232-GB-RJ.

When you enable auto-MDIX on an interface, you must also set the interface speed to be autoneogiated

so that t he feat ure op erate s corr ectl y.

When auto-MDIX (and a utonegotia tion of s peed) is e nabled on one or bot h of con nected inte rfaces, li nk

up occurs even if the cable type (straight-through or crossover) is incorrect.

Examples This exampl e shows how to enable auto MDIX on a port:

Switch# configure terminal

Switch(config)# interface FastEthernet6/3

Switch(config-if)# speed auto

Switch(config-if)# mdix auto

Switch(config-if)# end

Related Commands Command Description

speed Configures the interface speed.

show interfaces D isplays traffic on a specific interface.