Cisco 2960-48TC - Catalyst Switch Handbuch

C97-404-735-00

Ethernet Power

Consumption for

Cisco®Switches

Introduction

Why is network power

consumption important?

How can we measure it?

How much power do

Ethernet switches consume?

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 Examples

33 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.

Miercom Measures Power Consumption

Cisco®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 generated

Frame size sequence: 64, 128,

256, 512, 1024, 1280, and

1518 bytes

Layer 2 and Layer 3 tested

1GE and 10GE tested

KillAWatt is u

measure the power

consumption for each

device under test.

Traffic Generator

sed to

KillAWatt

Results: 100% Throughput

Power Consumption at 100%

122 129 142 143

161

205 212

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

HP ProCurve

2650 Cisco

2960G Nortel Baystack

5510 Cisco 3560-E Cisco 3750E Cisco 3750-G 3Com 5500

G-E ProCurve

3500yl

Cisco®

2960

Results: Layer 2 Switches

Power Consumption of Layer 2 switches at 100%

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.

Results: Layer 3 Switches

Power Consumption of Layer 3 switches at 100%

100

150

200

250

Nortel Baystack

5510

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

Supports Gig E 10/100/1000. Stackable

Supports up to 10 Gig - Stackable

Supports up to 10 Gig - Fixed

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

Layer 3: Cisco®3750-E vs. HP 3500yl vs. 3Com 5500GE

Cisco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

Power Consumption (Watts)

Cisco®switches consume 33%

less power than 3Com and HP

switches

3Com5500G‐E2x10GBUplinks100%

120 64 128 256 512 1024

Packet Size (Bytes) 1280 1518

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

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

Power Consumption (Watts)

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%

120 64 128 256 512 1024 1280 1518

Packet Size (Bytes)

Observation

Financial 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 3500yl

Comparative 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 switch

Over a 5-year period: $1228.10

1000 racks: $1,228,100.00

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