Port speed and duplex mode modification
The Gigabit Ethernet copper ports are designed to auto-sense and auto-negotiate the speed and duplex mode of the connected device. If the attached device does not support this operation, you can manually enter the port speed to operate at either 10, 100, or 1000 Mbps. This configuration is referred to as force mode. The default and recommended setting is 10/100/1000 auto-sense. Port duplex mode and port speed are modified by the same command
Note: You can modify the port speed of copper ports only; this feature does not apply to
fiber ports.
Note: For optimal link operation, copper ports on devices that do not support 803.3u must
be configured with like parameters, such as speed (10,100,1000), duplex (half, full),
MDI/MDIX, and Flow Control.