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© 2008 Cisco Systems, Inc. All rights reserved. Cisco Public 1 C97-404-735-00 Ethernet Power Consumption for Cisco ® Switches

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© 2008 Cisco Systems, Inc. All rights reserved. Cisco Public 1C97-404-735-00

Ethernet Power Consumption for Cisco® Switches

© 2008 Cisco Systems, Inc. All rights reserved. Cisco PublicC97-404-735-00 2

Introduction

Why is network power consumption important?

How can we measure it?

How much power do Ethernet switches consume?

© 2008 Cisco Systems, Inc. All rights reserved. Cisco PublicC97-404-735-00 3

Network Power Consumption

Customers calculating total cost of ownership need to factor in power consumption.

Likewise, power consumption contributes to a company’s carbon footprint.

Miercom was commissioned by Cisco to measure power consumption in Ethernet switches

Power Consumption Examples33 watts is the power consumed by a ceiling fan at average speed. 60 watts is the power required to light an incandescent bulb.80 watts is the power consumed by an average PC. 200 watts is the power consumed by an average LCD.

© 2008 Cisco Systems, Inc. All rights reserved. Cisco PublicC97-404-735-00 4

Miercom Measures Power ConsumptionCisco® Catalyst 2960 48TC-L

Cisco Catalyst 2960G-48-TC-L

Cisco Catalyst-3750G-48PS

Nortel BayStack 5510-48T

HP ProCurve 2650

Cisco Catalyst 3560E-48PD

Cisco Catalyst-3750E-48PD-F

3Com 5500G-E

HP ProCurve 3500yl-48G

Device Under Test

5% and 100% throughput traffic generatedFrame size sequence: 64, 128, 256, 512, 1024, 1280, and 1518 bytesLayer 2 and Layer 3 tested1GE and 10GE tested

KillAWatt is umeasure the power consumption for each device under test.

Traffic Generator

sed to

KillAWatt

© 2008 Cisco Systems, Inc. All rights reserved. Cisco PublicC97-404-735-00 5

Results: 100% Throughput

Power Consumption at 100%

37

56

122129

142 143161

205212

Fast Ethernet GE, no PoE Up to 10 Gig + PoE

HP ProCurve2650

Cisco2960G

Nortel Baystack5510

Cisco 3560-E Cisco 3750E Cisco 3750-G 3Com 5500G-E

ProCurve3500yl

Cisco®

2960

© 2008 Cisco Systems, Inc. All rights reserved. Cisco PublicC97-404-735-00 6

Results: Layer 2 SwitchesPower Consumption of Layer 2 switches at 100%

0

20

40

60

80

100

120

140

Cisco WS-C2960 HP Procurve 2650 Cisco WS-C2960G

Supports Gigabit Ethernet

The Cisco® WS-C2960G supports Gigabit Ethernet. The other switches support only Fast Ethernet, which results in

increased power consumption.

© 2008 Cisco Systems, Inc. All rights reserved. Cisco PublicC97-404-735-00 7

Results: Layer 3 Switches

Power Consumption of Layer 3 switches at 100%

0

50

100

150

200

250

Nortel Baystack5510

Cisco® 3560-E Cisco 3750ECisco 3750-G 3Com 5500G-E HP3500yl

Supports Gig E 10/100/1000. Stackable

Supports up to 10 Gig - StackableSupports up to 10 Gig - Fixed

© 2008 Cisco Systems, Inc. All rights reserved. Cisco PublicC97-404-735-00 8

Results: Layer 3 for Cisco, HP, and 3COM

Layer 3: Cisco® 3750-E vs. HP 3500yl vs. 3Com 5500GECisco 3750E Cu Uplinks 100%

Cisco 3750E Fiber Uplinks 100%

Cisco 3750E 2x10GB Uplinks 100%

HP 3500yl‐48 Cu uplinks 100%

HP 3500yl fiber uplinks 100%

HP 3500yl 2x10GB Uplinks 100%

3Com 5500G‐E Cu Uplinks 100%

3Com 5500G‐E Fiber Uplinks 100%140

160

180

200

220

240

Pow

er C

onsu

mpt

ion

(Wat

ts)

Cisco® switches consume 33% less power than 3Com and HP

switches

3Com 5500G‐E 2x10GB Uplinks 100%12064 128 256 512 1024

Packet Size (Bytes)1280 1518

The Continued Innovation in the Cisco® E Series is Proven Once Again

© 2008 Cisco Systems, Inc. All rights reserved. Cisco PublicC97-404-735-00 9

Results: “E Series” Improvements

Layer 3: Cisco® 3750-E vs. 3750-G Series

170 Cisco 3750-E Cu Uplinks 100%

165

130

135

140

145

150

155

160

Pow

er C

onsu

mpt

ion

(Wat

ts)

Cisco 3750-E 2x10G Uplinks 100%

Cisco 3750-G Fiber Uplinks 100%

Cisco 3750-E Fiber Uplinks 100%

125

Cisco 3750-G Cu Uplinks 100%12064 128 256 512 1024 1280 1518

Packet Size (Bytes)

© 2008 Cisco Systems, Inc. All rights reserved. Cisco PublicC97-404-735-00 10

ObservationFinancial Saving

Power per switch 212 W

Power in a 3-switch rack 636 W

Heat dissipated in BTU (1 W = 3.41 BTU) 2168.76 BTU

Power consumed in cooling 1 BTU 0.105 W

Power consumed for cooling 227.71 W

Total power consumed by switch 863.71 W

Cost per Kwh 10 cents

Cost per day $2.07

Cost per year $ 755.98

HP Procurve 3500ylComparative study

Power per switch 143 W

Power in a 3-switch rack 429 W

Heat dissipated in BTU (1 W = 3.41 BTU) 1462.89 BTU

Power consumed in cooling 1 BTU 0.105 W

Power consumed for cooling 153.60 W

Total power consumed by switch 582.60 W

Cost per Kwh 10 cents

Cost per day $1.39

Cost per year $ 510.36

Cisco® 3750-E

$245.62 is saved per 3-switch rack by a Cisco switch when compared to a HP switchOver a 5-year period: $1228.10

1000 racks: $1,228,100.00

© 2008 Cisco Systems, Inc. All rights reserved. Cisco PublicC97-404-735-00 11

More use for energy expenseRun a PC and a 3750E at the cost of a HP 3500yl !

Environmental BenefitsReduce your Co2 emission by 55 ton.Decrease your carbon footprint

Observation ContinuedFinancial Saving…

A Watt Saved Is A Watt Earned

C97-404-735-00 © 2008 Cisco Systems, Inc. All rights reserved. Cisco Public