Lost or Forgotten Password on a Switch
The default configuration for the switch allows an end user with physical access to the switch to recover from
a lost password by interrupting the boot process during power-on and by entering a new password. These
recovery procedures require that you have physical access to the switch.
On these switches, 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.
Note
Related Topics
Recovering 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 Catalyst 2960-X Switch Interface and Hardware
Component Configuration Guide.
Related Topics
Scenarios to Troubleshoot Power over Ethernet (PoE), on page 1650
Disabled Port Caused by Power Loss
If a powered device (such as a Cisco IP Phone 7910) that is connected to a PoE Switch 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 Switch to recover
from the error-disabled state.
On a Switch, 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.
Consolidated Platform Configuration Guide, Cisco IOS Release 15.2(4)E (Catalyst 2960-X Switches)
1626
Information About Troubleshooting the Software Configuration
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