Filter
Top Products
9-20
Cisco ME 3400 Ethernet Access Switch Software Configuration Guide
OL-9639-06
Chapter 9 Configuring Interfaces
Configuring Ethernet Interfaces
Beginning in privileged EXEC mode, follow these steps to configure IEEE 802.3x flow control on an
interface:
To disable IEEE 802.3x flow control, use the flowcontrol receive off interface configuration command.
This example shows how to enable IEEE 802.3x flow control on a port:
Switch# configure terminal
Switch(config)# interface gigabitethernet0/1
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 speed and duplex
on the interface to auto so that the feature operates correctly. Auto-MDIX is supported on all 10/100 and
10/100/1000 Mbps interfaces and on Cisco 10/100/1000 BASE-T/TX SFP module interfaces. It is not
supported on 1000 BASE-SX or -LX SFP module interfaces.
Table 9-3 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
no shutdown Enable the port, if necessary. By default, UNIs and ENIs are
disabled, and NNIs are enabled.
Step 4
flowcontrol {receive} {on | off | desired} Configure the IEEE 802.3x flow control mode for the port.
Step 5
end Return to privileged EXEC mode.
Step 6
show interfaces interface-id Verify the interface IEEE 802.3x flow control settings.
Step 7
copy running-config startup-config (Optional) Save your entries in the configuration file.
Ta ble 9-3 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