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Catalyst 2960 and 2960-S Switch Software Configuration Guide
OL-8603-09
Chapter 12 Configuring Interface Characteristics
Configuring Ethernet Interfaces
Beginning in privileged EXEC mode, follow these steps to configure flow control on an interface:
To disable flow control, use the flowcontrol receive off interface configuration command.
This example shows how to turn on flow control on a port:
Switch# configure terminal
Switch(config)# interface gigabitethernet1/0/1
Switch(config-if)# flowcontrol receive on
Switch(config-if)# end
Configuring 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 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.
Auto-MDIX is enabled by default. When you enable auto-MDIX, you must also set the interface speed
and duplex to auto so that the feature operates correctly.
Auto-MDIX is supported on all 10/100 and 10/100/1000-Mb/s interfaces. It is not supported on
1000BASE-SX or -LX SFP module interfaces.
Table 12-4 shows the link states that result from auto-MDIX settings and correct and incorrect cabling.
Command Purpose
Step 1
configure terminal Enter global configuration mode.
Step 2
interface interface-id Specify the physical interface to be configured, and enter
interface configuration mode.
Step 3
flowcontrol {receive} {on | off | desired} Configure the flow control mode for the port.
Step 4
end Return to privileged EXEC mode.
Step 5
show interfaces interface-id Verify the interface flow control settings.
Step 6
copy running-config startup-config (Optional) Save your entries in the configuration file.
Table 12-4 Link Conditions and Auto-MDIX Settings
Local Side Auto-MDIX Remote Side Auto-MDIX With Correct Cabling With Incorrect Cabling
On On Link up Link up
On Off Link up Link up
Off On Link up Link up
Off Off Link up Link down