Setting The Interface Speed And Duplex Parameters - Cisco Catalyst 3750-X Software Configuration Manual

Chapter 13 Configuring Interface Characteristics
Changing the interface speed and duplex mode configuration might shut down and re-enable the
Caution
interface during the reconfiguration.

Setting the Interface Speed and Duplex Parameters

Beginning in privileged EXEC mode, follow these steps to set the speed and duplex mode for a physical
interface:
Command
Step 1
configure terminal
Step 2
interface interface-id
speed {10 | 100 | 1000 | auto [10 | 100 |
Step 3
1000] | nonegotiate}
duplex {auto | full | half}
Step 4
Step 5 end
Step 6 show interfaces interface-id
Step 7
copy running-config startup-config
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.
OL-21521-01
Purpose
Enter global configuration mode.
Specify the physical interface to be configured, and enter interface
configuration mode.
This command is not available on a 10-Gigabit Ethernet interface.
Enter the appropriate speed parameter for the interface:
Enter 10, 100, or 1000 to set a specific speed for the interface.
•
The 1000 keyword is available only for 10/100/1000 Mb/s ports.
Enter auto to enable the interface to autonegotiate speed with the
•
connected device. If you use the 10, 100, or the 1000 keywords
with the auto keyword, the port autonegotiates only at the
specified speeds.
The nonegotiate keyword is available only for SFP module por ts.
•
SFP module ports operate only at 1000 Mb/s but can be
configured to not negotiate if connected to a device that does not
support autonegotiation.
For more information about speed settings, see the
Configuration Guidelines" section on page
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 Mb/s). You cannot configure half-duplex mode for interfaces
operating at 1000 Mb/s.
You can configure the duplex setting when the speed is set to auto.
For more information about duplex settings, see the
Duplex Configuration Guidelines" section on page
Return to privileged EXEC mode.
Display the interface speed and duplex mode configuration.
(Optional) Save your entries in the configuration file.
Catalyst 3750-X and 3560-X Switch Software Configuration Guide
Configuring Ethernet Interfaces
"Speed and Duplex
13-28.
"Speed and
13-28.
13-29