Note On these devices, a system administrator can disable some of the functionality of this feature by allowing an end user to reset a password only by agreeing to return to the default configuration. If you are an end user trying to reset a password when password recovery has been disabled, a status message reminds you to return to the default configuration during the recovery process. You cannot recover encryption password key, when Cisco WLC configuration is copied from one Cisco WLC to another (in case of an RMA). Note Follow the steps described in the section Recovering from a Lost or Forgotten Password, on page 14 to recover from a lost or forgotten password.
Power over Ethernet Ports A Power over Ethernet (PoE) switch port automatically supplies power to one of these connected devices if the switch detects that there is no power on the circuit: • a Cisco pre-standard powered device (such as a Cisco IP Phone or a Cisco Aironet Access Point) • an IEEE 802.3af-compliant powered device • an IEEE 802.3at-compliant powered device A powered device can receive redundant power when it is connected to a PoE switch port and to an AC power source. The device does not receive redundant power when it is only connected to the PoE port.
After the switch detects a powered device, the switch determines the device power requirements and then grants or denies power to the device. The switch can also detect the real-time power consumption of the device by monitoring and policing the power usage. For more information, see the "Configuring PoE" chapter in the Interface and Hardware Component Configuration Guide (Catalyst 9300 Switches) . Refere the section Scenarios to Troubleshoot Power over Ethernet (PoE), on page 25 for various PoE troubleshooting scenarios.
Disabled Port Caused by Power Loss If a powered device (such as a Cisco IP Phone 7910) that is connected to a PoE device port and powered by an AC power source loses power from the AC power source, the device might enter an error-disabled state. To recover from an error-disabled state, enter the shutdown interface configuration command, and then enter the no shutdown interface command. You can also configure automatic recovery on the device to recover from the error-disabled state.
On a device, the errdisable recovery cause loopback and the errdisable recovery interval seconds global configuration commands automatically take the interface out of the error-disabled state after the specified period of time. Troubleshooting the Software Configuration Power over Ethernet Ports Troubleshooting the Software Configuration 2