Cisco Catalyst 2960 Software Configuration Manual page 347

Chapter 12 Configuring Interface Characteristics
For information about configuring these ports, see the
Ports on Compact Switches" section on page
Universal Power Over Ethernet
Note
Universal Power over Ethernet (UPoE) is a Cisco proprietary technology that extends the IEEE 802.at
PoE standard to provide the capability to source up to 60 W of power over standard Ethernet cabling
infrastructure (Class D or better). The 3K-X UPoE capabilities provide up to 60 W using the spare pair
of an RJ-45 cable (wires 4,5,7,8) with the signal pair (wires 1,2,3,6). Power on the spare pair is enabled
when the switch port and enddevice mutually identify themselves as Universal PoE (UPoE)-capable
using CDP or LLDP and the enddevice requests for power to be enabled on the spare pair. When the spare
pair is powered, the enddevice can negotiate up to 60 W of power from the switch using CDP or LLDP.
Enabling Power on Signal/Spare Pairs
If the enddevice is PoE-capable on both signal and spare pairs but does not support the CDP or LLDP
extensions required for UPoE, a 4-pair forced mode configuration automatically enables power on both
signal and spare pairs from the switch port.
To enable the power on the pairs, follow these steps:
Command
Step 1 interface terminal
Step 2
interface {fastethernet | gigabitethernet} slot/port
Step 3
[no] power inline four-pair forced
Step 4 end
Step 5 show platform software interface {fastethernet |
gigabitethernet} slot/port status
The following example shows how to automatically enable power on both signal and spare pairs from
switch port Gigabit Ethernet 2/1:
Switch# configure terminal
Enter configuration commands, one per line. End with CNTL/Z.
Switch(config)# interface gigabitethernet 2/1
Switch(config-if)# power inline four-pair forced
Switch(config-if)# end
Do not enter this command if the enddevice cannot source inline power on the spare pair or if the
enddevice supports the CDP or LLDP extensions for UPoE.
Configuring Power Consumption for Powered Devices on an Interface
When the switch detects a powered device on an interface, it provides the default power to the device.
When the switch receives a CDP packet from the powered device, the power is automatically negotiated
to a wattage required by the device. Normally, this automatic negotiation works well, and no further
OL-26520-01
Only Catalyst 2960-C switches support Universal Power over Ethernet.
Catalyst 2960 and 2960-S Switches Software Configuration Guide, Release 15.0(1)SE
"Configuring Catalyst PoE and PoE Pass-Through
12-37.
Purpose
Changes the mode to global configuration.
Selects the interface to configure.
Automatically enables or disables power on both signal and
spare pairs from a switch port.
Exits configuration mode.
Displays EEE status.
Understanding Interface Types
12-11