Cisco Systems WSC2960X48TDL manual Budgeting Power for Devices Connected to a PoE Port

Configuring PoE

Budgeting Power for Devices Connected to a PoE Port

DETAILED STEPS

	Command or Action	Purpose
Step 1	configure terminal	Enters global configuration mode.
	Example:
	Switch# configure terminal
Step 2	interface interface-id	Specifies the physical port to be configured, and enters interface configuration
		mode.

Example:

Switch(config)# interface

gigabitethernet2/0/1

Step 3 power inline {auto [max max-wattage] Configures the PoE mode on the port. The keywords have these meanings:

never static [max max-wattage]}

Example:

Switch(config-if)# power inline auto

•auto—Enables powered-device detection. If enough power is available, automatically allocates power to the PoE port after device detection. This is the default setting.

•never —Disables device detection, and disable power to the port.

Note If a port has a Cisco powered device connected to it, do not use the power inline never command to configure the port. A false link-up can occur, placing the port into the error-disabled state.

•static—Enables powered-device detection. Pre-allocate (reserve) power for a port before the switch discovers the powered device. The switch reserves power for this port even when no device is connected and guarantees that power will be provided upon device detection.

The switch allocates power to a port configured in static mode before it allocates power to a port configured in auto mode.

Step 4 end Returns to privileged EXEC mode.

Example:

Switch(config-if)# end

Step 5 show power inline

switch-number]

Example:

[interface-id module Displays PoE status for a switch or a switch stack, for the specified interface, or for a specified stack member.

The module switch-numberkeywords are supported only on stacking-capable switches.

Switch# show power inline

Budgeting Power for Devices Connected to a PoE Port

When Cisco powered devices are connected to PoE ports, the switch uses Cisco Discovery Protocol (CDP) to determine the CDP-specificpower consumption of the devices, and the switch adjusts the power budget accordingly. This does not apply to IEEE third-party powered devices. For these devices, when the switch

	Catalyst 2960-X Switch Interface and Hardware Component Configuration Guide, Cisco IOS Release 15.0(2)EX
82	OL-29034-01