If you are unable to access the switch through the web interface, perform this procedure:
Unplug the power cord from the switch.
Hold the setup button while you plug back in the power to the switch.
Wait until all LED indicator lights turn amber, and then release the button.
When a switch port LED blinks green, connect your PC to that port. The port LEDs on your PC and the switch blink green while the switch configures the connection. This takes about one minute.
Pull up the browser, and select either Erase system configuration item and click Submit.
The switch is now set back to the factory default configuration. Proceed with the initial setup procedure again.
Enter the network settings.
Click Submit to save changes, and finish the basic configuration.
Apply the Smartports roles. This is a very important step if you plan to configure trunk or voice ports. By default, all ports are set up as access ports that belong to VLAN 1.
Note: By default, the switch is set up to VLAN Trunking Protocol (VTP) transparent mode. Therefore, all VLANs should be added using the Graphical User Interface (GUI). Name the voice VLAN Cisco-Voice. If you use a different name, it is not recognized as a voice VLAN by the switch.