Cisco 3750G - Catalyst Integrated Wireless LAN Controller User Manual

11-19
Catalyst 3750 Switch Software Configuration Guide
OL-8550-02
Chapter 11 Configuring Interface Characteristics
Configuring Ethernet Interfaces
Use the no speed and no duplex interface configuration commands to return the interface to the default
speed and duplex settings (autonegotiate). To return all interface settings to the defaults, use the default
interface interface-id interface configuration command.
This example shows how to set the interface speed to 10 Mbps and the duplex mode to half on a
10/100 Mbps port:
Switch# configure terminal
Switch(config)# interface fasttethernet1/0/3
Switch(config-if)# speed 10
Switch(config-if)# duplex half
This example shows how to set the interface speed to 100 Mbps on a 10/100/1000 Mbps port:
Switch# configure terminal
Switch(config)# interface gigabitethernet1/0/2
Switch(config-if)# speed 100
Note For interfaces gi0/1 to gi0/16, speed and duplex settings do not apply, as they are only internal
server-facing interfaces. For interfaces 17 to 20, speed and duplex do not apply when they are operating
in SFP module mode. For interfaces gi0/23 and gi0/24, speed and duplex do not apply when configured
for media-type internal. For more information, see the “Access Ports” section on page 11-3.
Configuring IEEE 802.3x Flow Control
Flow control enables connected Ethernet ports to control traffic rates during congestion by allowing
congested nodes to pause link operation at the other end. If one port experiences congestion and cannot
receive any more traffic, it notifies the other port by sending a pause frame to stop sending until the
condition clears. Upon receipt of a pause frame, the sending device stops sending any data packets,
which prevents any loss of data packets during the congestion period.
Note Catalyst 3750 ports can receive, but not send, pause frames.
You use the flowcontrol interface configuration command to set the interface’s ability to receive pause
frames to on, off, or desired. The default state is off.
Step 4
duplex {auto | full | half} This command is not available on a 10-Gigabit Ethernet interface.
Enter the duplex parameter for the interface.
Enable half-duplex mode (for interfaces operating only at 10 or
100 Mbps). You cannot configure half-duplex mode for interfaces
operating at 1000 Mbps.
Beginning with Cisco IOS Release 12.2(20)SE1, you can configure
the duplex setting when the speed is set to auto.
For more information about duplex settings, see the “Speed and
Duplex Configuration Guidelines” section on page 11-17.
Step 5
end Return to privileged EXEC mode.
Step 6
show interfaces interface-id Display the interface speed and duplex mode configuration.
Step 7
copy running-config startup-config (Optional) Save your entries in the configuration file.
Command Purpose

Cisco 3750G - Catalyst Integrated Wireless LAN Controller Specifications

General

Brand	Cisco
Model	3750G - Catalyst Integrated Wireless LAN Controller
Category	Wireless Router
Language	English