Cisco 2960-48TC - Catalyst Switch Manual
© 2008 Cisco Systems, Inc. All rights reserved. Cisco Public 1
C97-404-735-00
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 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.
© 2008 Cisco Systems, Inc. All rights reserved. Cisco PublicC97-404-735-00 4
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
© 2008 Cisco Systems, Inc. All rights reserved. Cisco PublicC97-404-735-00 5
Results: 100% Throughput
Power Consumption at 100%
37
56
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
© 2008 Cisco Systems, Inc. All rights reserved. Cisco PublicC97-404-735-00 6
Results: Layer 2 Switches
Power 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 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
© 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 5500GE
Cisco3750ECuUplinks100%
Cisco3750EFiberUplinks100%
Cisco3750E2x10GBUplinks100%
HP3500yl‐48Cuuplinks100%
HP3500ylfiberuplinks100%
HP3500yl2x10GBUplinks100%
3Com5500G‐ECuUplinks100%
3Com5500G‐EFiberUplinks100%
140
160
180
200
220
240
Power Consumption (Watts)
Cisco®switches consume 33%
less power than 3Com and HP
switches
3Com5500G‐E2x10GBUplinks100%
120 64 128 256 512 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
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)
© 2008 Cisco Systems, Inc. All rights reserved. Cisco PublicC97-404-735-00 10
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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