Cisco Catalyst 4500 Series - Configuring Auto-MDIX on a Port

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Software Configuration Guide—Release IOS XE 3.6.0E and IOS 15.2(2)E
OL-30933-01
Chapter 8 Configuring Interfaces
Configuring Optional Interface Features
Note The default time is 10ms for E-series supervisor engines and line cards.
When configuring the debounce timer on a port, you can increase the port debounce timer value between
10 milliseconds and 5000 milliseconds on the 10-Gigabit Ethernet ports.
This example shows how to enable the port debounce timer on 10-Gigabit Ethernet port 2/1 and to accept
the default value (10 ms):
Switch# config terminal
Enter configuration commands, one per line. End with CNTL/Z.
Switch(config)# interface tenGigabitEthernet 2/1
Switch(config-if)# link debounce
Warning: Enabling debounce feature causes link down detection to be delayed
Switch(config-if)# exit
This example shows how to enable the port debounce timer of 5000 ms on 10-Gigabit Ethernet port 2/2
and to verify the setting:
Switch# config terminal
Enter configuration commands, one per line. End with CNTL/Z.
Switch(config)# interface tenGigabitEthernet 2/2
Switch(config-if)# link debounce time 5000
Warning: Enabling debounce feature causes link down detection to be delayed
Switch(config-if)# end
Switch#
Switch# show interfaces debounce | include enable
Te2/1 enable 10
Te2/2 enable 5000
Switch#
Configuring Auto-MDIX on a Port
When automatic medium-dependent-interface crossover (auto-MDIX) is enabled on an port, the port
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 to connect to other switches or repeaters. With auto-MDIX enabled, use either type of cable to
connect to other devices; the interface automatically corrects for any incorrect cabling. For more
information about cabling requirements, see the hardware installation guide.
Auto-MDIX is enabled by default. When you enable auto-MDIX, you must also set the speed on the port
to auto so that for the feature to operate correctly. auto-MDIX is supported on copper media ports. It is
not supported on fiber media ports.
Step 2
Switch(config-if)# link debounce [time
debounce_time]
Configures the debounce timer.
By default, debounce is disabled.
Switch(config-if)# no link debounce
Reverts to the default setting.
Step 3
Switch# show interfaces debounce
Verifies the configuration.
Command Purpose