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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…