Mdix Auto - Cisco Catalyst 4500 Series Configuration Manual
Ios software configuration guide isco ios xe 3.9.0e and ios 15.2(5)ex
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Also See for Catalyst 4500 Series:
- Software configuration manual (2086 pages) ,
- Administration manual (1814 pages) ,
- Configuration manual (1610 pages)
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Chapter 2
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.
Syntax Description
This command has no arguments or keywords.
Command Default
Auto-MDIX is enabled.
Command Modes
Interface configuration mode
Command History
Release
12.2(31)SGA
12.2(46)SG
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
The following 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
mdix auto
no mdix auto
Modification
This command was introduced on the Catalyst 4500 series switch.
Added supported and unsupported linecard information to the usage guidelines.
Catalyst 4500 Series Switch Cisco IOS Command Reference—Release XE 3.9.xE and 15.2(5)Ex
mdix auto
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