Configuring Power Consumption For Powered Devices On An Interface - Cisco 4500M Software Manual

Chapter 8 Configuring Power over Ethernet
The following example shows how to set the Fast Ethernet interface 4/1 to automatically detect PoE and
send power through that interface:
Switch# configure terminal
Enter configuration commands, one per line.
Switch(config)# interface fastethernet 4/1
Switch(config-if)# power inline auto
Switch(config-if)# end
This example shows how to verify the PoE configuration for the Fast Ethernet interface 4/1:
Switch# show power inline fastethernet 4/1
Available:677(w)
Interface Admin
--------- ------ ---------- ---------- ---------- ------------------- -----
Fa4/1
Interface
---------- --------------- --------------------
Fa4/1
Switch#
The following example shows how to configure an interface so that it never supplies power through the
interface:
Switch# configure terminal
Enter configuration commands, one per line.
Switch(config)# interface fastethernet 5/2
Switch(config-if)# power inline never
Switch(config-if)# end
Switch#

Configuring Power Consumption for Powered Devices on an Interface

This section contains the following subsections:
•
•
•
Overview
By default, when the switch detects a powered device on an interface, it assumes the powered device
consumes the maximum the port can provide (7 W on a legacy Power over Ethernet (PoE) module and
15.4W on the IEEE PoE modules introduced in Release 12.2(18)EW). Then, when the switch receives a
CDP packet from the powered device, the wattage automatically adjusts downward to the specific
amount required by that device. Normally, this automatic adjustment works well, and no further
configuration is required or recommended. However, you can specify the powered device's consumption
for the entire switch (or for a particular interface) to provide extra functionality from your switch. This
is useful when CDP is disabled or not available.
Note When manually configuring the consumption for powered devices, you need to account for the power
loss over the cable between the switch and the powered device.
OL-6696-01
Used:11(w)
Oper
auto on
AdminPowerMax
(Watts)
15.4
Overview, page 8-3
Intelligent Power Management, page 8-5
PoE and Supported Cabling Topology, page 8-5
End with CNTL/Z.
Remaining:666(w)
Power(Watts)
From PS To Device
11.2 10.0
AdminConsumption
(Watts)
10.0
End with CNTL/Z.
Software Configuration Guide—Release 12.2(25)EW
Device Class
Ieee PD 0
8-3