Consolidated Platform Configuration Guide, Cisco Ios Release 15.2(4)E (Catalyst 2960-X Switches - Cisco Catalyst 2960 series Configuration Manual

How to Configure Interface Characteristics
DETAILED STEPS
Command or Action
Step 1
enable
Example:
Switch> enable
Step 2
configure terminal
Example:
Switch# configure terminal
Step 3 interface interface-id
Example:
Switch(config)# interface
gigabitethernet1/0/3
Step 4 speed {10 | 100 | 1000 | 2500 | 5000 | 10000 |
auto [10 | 100 | 1000 | 2500 | 5000 | 10000] |
nonegotiate}
Example:
Switch(config-if)# speed 10
Step 5 duplex {auto | full | half}
Example:
Switch(config-if)# duplex half
Step 6
end
Example:
Switch(config-if)# end

Consolidated Platform Configuration Guide, Cisco IOS Release 15.2(4)E (Catalyst 2960-X Switches)

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Purpose
Enables privileged EXEC mode. Enter your password if prompted.
Enters global configuration mode.
Specifies the physical interface to be configured, and enter interface
configuration mode.
Enter the appropriate speed parameter for the interface:
• Enter 10, 100, 1000 2500, 5000, or 10000 to set a specific speed
for the interface.
• Enter auto to enable the interface to autonegotiate speed with
the connected device. If you specify a speed and also set the
auto keyword, the port autonegotiates only at the specified
speeds.
• The nonegotiate keyword is available only for SFP module
ports. 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.
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.
Returns to privileged EXEC mode.