Cisco Catalyst 4500 Series Command Reference Guide

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Catalyst 4500 Series Switch Cisco IOS Command Reference—Release IOS XE 3.4.0SG and IOS 15.1(2)SG)
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Chapter 2 Cisco IOS Commands for the Catalyst 4500 Series Switches
mdix auto
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-through or crossover) and configures 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 keywords.
Defaults Auto-MDIX is enabled.
Command Modes Interface configuration mode
Command History
Usage Guidelines The following linecards 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).
Linecards that support auto-MDIX by default when port auto-negotiation enabled and cannot be turned
off using an mdix CLI command include: WS-X4448-GB-RJ45, WS-X4548-GB-RJ45,
WS-X4424-GB-RJ45, and WS-X4412-2GB-T.
Linecards that cannot support auto-MDIX functionality, either by default or CLI commands, include:
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.
When you enable auto-MDIX on an interface, you must also set the interface speed to be autoneogiated
so that the feature operates correctly.
When auto-MDIX (and autonegotiation of speed) is enabled on one or both of connected interfaces, link
up occurs even if the cable type (straight-through or crossover) is incorrect.
Examples This example 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
Release Modification
12.2(31)SGA Support for this command was introduced on the Catalyst 4500 series switch.
12.2(46)SG Added supported and unsupported linecard information to the usage guidelines.

Cisco Catalyst 4500 Series Specifications

General

Series	Catalyst 4500 Series
Category	Switch
Layer Support	Layer 2, Layer 3
Form Factor	Modular chassis
Stackable	No
Chassis Slots	3, 6, 7, 10
Power Supply Options	AC, DC
Redundancy	Power supply, Supervisor engine
Network Management	Cisco IOS Software CLI, SNMP, Cisco Prime Infrastructure
Features	Security, QoS
Port Density	Up to 384 ports per chassis
Security Features	802.1X, ACLs, DHCP Snooping, Dynamic ARP Inspection, IP Source Guard
Supervisor Engine	8-E