Cisco Catalyst 4500 Series Software Configuration Guide

15-4
Catalyst 4500 Series Switch, Cisco IOS Software Configuration Guide - Cisco IOS XE 3.9.xE and IOS 15.2(5)Ex
Chapter 15 Configuring Power over Ethernet
Power Management Modes
Note If you set a non-PoE-capable interface to automatically detect and apply power, an error message
indicates that the configuration is not valid.
The following example shows how to set the Fast Ethernet interface 4/1 to automatically detect PoE and
send power through that interface, and to verify the PoE configuration:
Switch# configure terminal
Enter configuration commands, one per line. End with CNTL/Z.
Switch(config)# interface fastethernet 4/1
Switch(config-if)# power inline auto
Switch(config-if)# end
Switch# show power inline fastethernet 4/1
Available:677(w) Used:11(w) Remaining:666(w)
Interface Admin Oper Power(Watts) Device Class
From PS To Device
--------- ------ ---------- ---------- ---------- ------------------- -----
Fa4/1 auto on 11.2 10.0 Ieee PD 0
Interface AdminPowerMax AdminConsumption
(Watts) (Watts)
---------- --------------- --------------------
Fa4/1 15.4 10.0
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. End with CNTL/Z.
Switch(config)# interface fastethernet 5/2
Switch(config-if)# power inline never
Switch(config-if)# end
Switch#
Intelligent Power Management
All Catalyst 4500 PoE-capable modules use Intelligent Power Management to provide power on each
interface. When a powered device (PD) is attached to a PoE-capable port, the port detects the PD and
provision power accordingly. If a Cisco PD is used, the switch and PD negotiate power using CDP
packets to determine the precise amount of power needed by the PD. If the PD is 802.3af compatible,
the difference between what is mandated by the 802.3af class and what is actually needed by the PD is
returned to the power budget for use by additional devices. In this way, power negotiation enables
customers to stretch their power budget and use it more effectively.
Power negotiation also enables the interoperability of newer Cisco powered devices with older legacy
PoE-capable ports from Cisco. Newer Cisco PDs do not consume more than what the switch port can
provide.

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