Power Over Ethernet (PoE) Operation

Viewing PoE Configuration and Status

Displaying the PoE Status on Specific Ports

Syntax: show power-over-ethernet <port-list>

Displays the following PoE status and statistics (since the last reboot) for each port in < port-list>:

•Power Enable: Shows Yes for ports enabled to support PoE (the default) and No for ports on which PoE is disabled.

•Priority: Lists the power priority (Low, High, and Critical) configured on ports enabled for PoE. (For more on this topic, refer to the power command description under “Configuring PoE Operation” on page 11-6.)

•Allocate By: How PoE is allocated (usage, class, value)

•Detection Status:

–Searching: The port is available to support a PD connection.

–Delivering: The port is delivering power to a PD.

–Disabled: PoE support is disabled on the port. To re-enable PoE support, refer to “Configuring PoE Operation” on page 11-6.

–Fault: The switch detects a problem with the connected PD.

•Over Current Cnt: Shows the number of times a connected PD has attempted to draw more than 15.4 watts. Each occurrence generates an Event Log message.

•Power Denied Cnt: Shows the number of times PDs requesting power on the port have been denied due to insufficient power available. Each occurrence generates an Event Log message.

•Voltage: The total voltage, in Volts, being delivered to PDs.

•Power: The total power, in Watts, being delivered to PDs.

•LLDP Detect: Port is enabled or disabled for allocating PoE power based on the link-partner’s capabilities via LLDP

•Configured Type: Shows the type of PD detected on the port.

•Value: The maximum amount of PoE power allocated for that port (expressed in watts). Default 17W for PoE.

•Power Class: Shows the power class of the PD detected on the indicated port.

•MPS Absent Cnt: This value shows the number of times a detected PD has no longer requested power from the port. Each occurrence generates an Event Log message. (“MPS” refers to the “Maintenance Power Signature”. Refer to “Terminology” on page 11-3.)

•Short Cnt: Shows the number of times the switch provided insufficient current to a connected PD.

•Current: The total current, in mA, being delivered to PDs.

11-19