How to disable speed and duplex auto-negotiation on Cisco 2960

If you're having trouble finding the "speed" and "duplex" options for the Gigabit Ethernet ports in the interface configuration of your Cisco 2960, try manually setting the interface type.

swith01#sh run int gi0/1
Building configuration...

Current configuration : 126 bytes
!
interface GigabitEthernet0/1
switchport mode trunk
end

swith01#conf term
Enter configuration commands, one per line. End with CNTL/Z.
swith01(config)#int g0/1
swith01(config-if)#speed ?
% Unrecognized command
swith01(config-if)#media-type ?
auto-select Use whichever connector is attached
rj45 Use RJ45 connector
sfp Use SFP connector

swith01(config-if)#media-type rj45
swith01(config-if)#speed ?
10 Force 10 Mbps operation
100 Force 100 Mbps operation
1000 Force 1000 Mbps operation
auto Enable AUTO speed configuration

swith01(config-if)#speed 100
swith01(config-if)#dupl
swith01(config-if)#duplex ?
auto Enable AUTO duplex configuration
full Force full duplex operation
half Force half-duplex operation

swith01(config-if)#duplex full
swith01(config-if)#end
swith01#sh run int
*Mar 1 00:04:04.318: %SYS-5-CONFIG_I: Configured from console by localuser on consolegi0/1
Building configuration...

Current configuration : 167 bytes
!
interface GigabitEthernet0/1
switchport mode trunk
media-type rj45
speed 100
duplex full
end