Configuring Auto-MDIX
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- Leo Wilkerson
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1 Prerequisites for Auto-MDIX, page 1 Restrictions for Auto-MDIX, page 1 Information about, page 1 How to Configure Auto-MDIX, page 2 Example for, page 3 Additional References, page 4 Feature History and Information for Auto-MDIX, page 4 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 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 OL
2 How to Configure Auto-MDIX straight-through cables to connect to devices such as servers, workstations, or routers and crossover cables to connect to other switches or repeaters. With auto-mdix enabled, you can use either type of cable to connect to other devices, and the interface automatically corrects for any incorrect cabling. For more information about cabling requirements, see the hardware installation guide. This table shows the link states that result from auto-mdix settings and correct and incorrect cabling. Table 1: Link Conditions and Auto-MDIX Settings Local Side Auto-MDIX Remote Side Auto-MDIX With Correct Cabling With Incorrect Cabling Link down How to Configure Auto-MDIX on an Interface SUMMARY STEPS 1. enable 2. configure terminal 3. interface interface-id 4. speed auto 5. duplex auto 6. end 7. copy running-config startup-config DETAILED STEPS Step 1 Command or Action enable Switch> enable Purpose Enables privileged EXEC mode. Enter your password if prompted. 2 OL
3 Example for Step 2 Command or Action configure terminal Purpose Enters global configuration mode Step 3 Step 4 Step 5 Step 6 Switch# configure terminal interface interface-id Switch(config)# interface gigabitethernet1/0/1 speed auto Switch(config-if)# speed auto duplex auto Switch(config-if)# duplex auto end Specifies the physical interface to be configured, and enter interface configuration mode. Configures the interface to autonegotiate speed with the connected device. Configures the interface to autonegotiate duplex mode with the connected device. Returns to privileged EXEC mode. Switch(config-if)# end Step 7 copy running-config startup-config (Optional) Saves your entries in the configuration file. Switch# copy running-config startup-config Example for This example shows how to enable auto-mdix on a port: Switch# configure terminal Switch(config)# interface gigabitethernet1/0/1 Switch(config-if)# speed auto Switch(config-if)# duplex auto Switch(config-if)# mdix auto Switch(config-if)# end OL
4 Additional References Additional References Error Message Decoder Description To help you research and resolve system error messages in this release, use the Error Message Decoder tool. Link index.cgi MIBs MIB All supported MIBs for this release. MIBs Link To locate and download MIBs for selected platforms, Cisco IOS releases, and feature sets, use Cisco MIB Locator found at the following URL: Technical Assistance Description The Cisco Support website provides extensive online resources, including documentation and tools for troubleshooting and resolving technical issues with Cisco products and technologies. To receive security and technical information about your products, you can subscribe to various services, such as the Product Alert Tool (accessed from Field Notices), the Cisco Technical Services Newsletter, and Really Simple Syndication (RSS) Feeds. Access to most tools on the Cisco Support website requires a Cisco.com user ID and password. Link Feature History and Information for Auto-MDIX Release Cisco IOS 15.0(2)EX Modification This feature was introduced. 4 OL
5 Feature History and Information for Auto-MDIX OL
6 Feature History and Information for Auto-MDIX 6 OL
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