Cisco Catalyst 4500 Series Command Reference Guide

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Catalyst 4500 Series Switch Cisco IOS Command Reference—Release IOS XE 3.4.0SG and IOS 15.1(2)SG)
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Chapter 2 Cisco IOS Commands for the Catalyst 4500 Series Switches
power inline four-pair forced
power inline four-pair forced
Note This command is available only on Supervisor Engine 7-E and Supervoisor Engine 7L-E.
To automatically enable power on both signal and spare pairs from a switch port, provided the end-device
is PoE capable on both signal and spare pairs but does not support the CDP or LLDP extensions required
for UPOE, use the power inline four-pair forced command.
power inline four-pair forced
Syntax Description This command has no arguments or keywords.
Defaults None
Command Modes Interface configuration mode
Command History
Usage Guidelines 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 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
Examples 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)# shutdown
Switch(config-if)# no shutdown
Switch(config-if)# end
Switch#
Release Modification
15.0(2)SG This command was introduced on the Catalyst 4500 series switch using a
Supervisor Engine 7-E and 7L-E.

Cisco Catalyst 4500 Series Specifications

General

Series	Catalyst 4500 Series
Category	Switch
Layer Support	Layer 2, Layer 3
Form Factor	Modular chassis
Stackable	No
Chassis Slots	3, 6, 7, 10
Power Supply Options	AC, DC
Redundancy	Power supply, Supervisor engine
Network Management	Cisco IOS Software CLI, SNMP, Cisco Prime Infrastructure
Features	Security, QoS
Port Density	Up to 384 ports per chassis
Security Features	802.1X, ACLs, DHCP Snooping, Dynamic ARP Inspection, IP Source Guard
Supervisor Engine	8-E