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Managing Power Conservation With Cisco EnergyWise


Cisco TAC engineers Blayne Dreier and Joe Clarke answer this question sent in by TS Newsletter reader Martin Eardly.

You can routinely reduce the power consumption of 6900, 8900, and 9900 series Cisco IP Phones to 1 watt or less by using the Cisco EnergyWise Power Save Plus mode. Power over Ethernet-capable switches, including the 2960, 2960-S, 3560, 3560-E, 3560-X, 3750, 3750-E, 3750-X, 4500, and 6500, support Cisco EnergyWise.

Power usage statistics can be viewed centrally from Cisco Prime LAN Management Solution 4.1. Additionally, since Cisco EnergyWise uses a distributed protocol, statistics for all endpoints can be viewed directly from the command line of any switch in the EnergyWise domain by using the command:

energywise query importance 100 name * collect usage

EW policies can be scheduled so that port power levels can be set to 0 at a certain time. For example, you can configure the following for an EnergyWise-controlled port:

energywise level 0 recurrence importance 100 at 0 19 * * * energywise

level 10 recurrence importance 100 at 0 7 * * *

This will set the power level to 0 (no power) at 7:00 pm, then back to 10 (full power) at 7:00 am.

This is a good info page:

TS Newsletter Editor's Note:  Many thanks to Martin Eardley for sending his question to our Cisco TAC engineers. If you have a question for a Cisco TAC engineer, send it to If we publish your question, you’ll be the envy of all your friends, and we’ll send you some free stuff...

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