Configuring Universal Poe - Cisco Catalyst 4500 Series Software Configuration Manual

Enhanced Power PoE Support on the E-Series Chassis
The default power inline configurations usually are sifficient; no additional configuration is required
even for high power-consumption Cisco powered devices (for example, a Cisco AP1250 Wireless Access
Point). When a high-power consumption device is attached to a port on a WS-X4648-RJ45V-E or
WS-X4648-RJ45V+E line card, the switch and device negotiate power using CDP packets to
automatically determine the extended amount of power needed by the device.
Depending on the deployment requirements and design, you specify a specific configuration with the
power inline command.
The following example shows how to pre-allocate PoE allocation to 16500 mW for Gi 2/1, regardless of
what is mandated either by the 802.3af class of the discovered device or by any CDP packet that is
received from the powered device:
Switch# configure terminal
Enter configuration commands, one per line. End with CNTL/Z.
Switch(config)# interface gigabitethernet 2/1
Switch(config-if)# power inline static max 16500
Switch(config-if)# end
Switch#

Configuring Universal PoE

This feature is only available on Supervisor Engine 7-E, Supervisor Engine 7L-E, and Supervisor Engine
Note
8-E.
Although IEEE 802.at only provides for power up to 30W per port, the WS-X4748-UPOE+E module can
provide up to 60W using the spare pair of an RJ45 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 end-device mutually identify
themselves as Universal PoE (UPOE) capable using CDP or LLDP and the end-device requests for power
on the spare pair to be enabled. When the spare pair is powered, the end-device can negotiate up to 60W
power from the switch using CDP or LLDP.
If the end-device is PoE capable on both signal and spare pairs but does not support the CDP or LLDP
extensions required for UPOE, then the following configuration automatically enables power on both
signal and spare pairs from the switch port:
Command
Step 1
Switch # interface terminal
Step 2
Switch(config)# interface {fastethernet |
gigabitethernet} slot/port
Step 3
Switch(config-if)# power inline four-pair
forced
Step 4
Switch(config-if)# shutdown
Step 5
Switch(config-if)# no
Step 6
Switch(config-if)# end
Step 7
Switch# show platform software interface
{fastethernet | gigabitethernet} slot/port
status
Catalyst 4500 Series Switch, Cisco IOS Software Configuration Guide - Cisco IOS XE 3.9.xE and IOS 15.2(5)Ex
15-16
Chapter 15
Purpose
Changes mode to global configuration.
Selects the interface to configure.
To automatically enables power on both signal and spare
pairs from a switch port.
Shuts down the port.
Boots the port.
Exits configuration mode.
Displays EEE status.
Configuring Power over Ethernet