HP Power over Ethernet (PoE/PoE+) Planning and Implementation Guide

2-1

Operating Rules

Introduction

This chapter discusses the operating rules and characteristics of the HP

networking product capabilities, switches, and external power supplies,

including an overview of how PoE power is configured on these devices, and

how the switches prioritize PoE provisioning to their network ports.

Configuring PoE/PoE+ Power Using the

CLI

Allocating PoE Power by Class or User-defined Power

Level

The 2910al, 2920, 3500, 3500yl, 3800 and the 5400zl/8200zl switches provide

maximum flexibility by allowing the switch to detect and display 802.3af or

802.3at device class, but does not enforce the power level specified in each

device class. In addition to this, the switch can allocate PoE/PoE+ power

according to the power level specified in each device class or a level defined

by the customer.

There are three methods to allocate PoE/PoE+ power:

■ By device usage (default). The switch does not enforce the power limit.

■ By power level specified in 802.3af or 802.3at. The device class will be

detected according to the specification and power limits will be enforced.

■ By user-defined configuration. Using the poe-value command, you can

configure per port values or for a range of ports to power values of 1-17

watts for PoE switches, or 1-33 watts for the PoE+ switches. Incorrectly

setting the PoE/PoE+ maximum value to be less than the connected

device requires will result in a PoE/PoE+ fault.

For more information, see the Management and Configuration Guide for

your switch at: