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TRANSCRIPT
The Changing Role of Wi-Fi
in the Enterprise
Paul Kersse
Area Vice President
Xirrus, Inc.
Agenda
• Introduction – Ethernet market dynamics
• Wi-Fi Basics
• Capacity Planning – Wired vs. Wi-Fi
• The Xirrus Approach
• Things to Consider
• Q&A
• The ethernet switching market is a $20B worldwide market
• It is 10x the Wi-Fi market
• It is still slightly growing depending on quarter
• Cisco still has over 70% ethernet switching market share
• It is still Cisco’s #1 revenue and margin producer
• The #2 share is HP with 10%
• No other vendor has more than 2% market share
• Most of them make Wi-Fi equipment also
• Aruba just launched a LAN access switch
• In 3 years, most devices will NOT have an ethernet port
• We think this is crazy!
Ethernet Market Dynamics
© 2011 Xirrus, Inc. All Rights Reserved.
Wi-Fi Basics: The Technology Curve
802.11n effectively put Wi-Fi performance on par with Wired
© 2011 Xirrus, Inc. All Rights Reserved.
Ethernet
Fast
Ethernet
Gigabit
Ethernet
1990 1995 2000 2005 2010
Ent
erpr
ise
Ado
ptio
n R
ate
Wired Wi-Fi
802.11b
802.11a/g
802.11n
802.11ac/ad/af
….then why do we keep buying ethernet switches?
Wi-Fi Basics: Radio – The Building Block
Radio Improvements
IEEE 802.11b
11Mb 2.4GHz
802.11n
150Mb 2.4GHz
300Mb 5GHz
802.11ac
Gigabit
1000Mb
5GHz
802.11a
54Mb 5GHz
802.11i
Security
TKIP +AES Encryption
Wi-Fi is about Math – It’s not About Marketing
802.11g
54Mb 2.4GHz
802.11ad
Multi-Gig
2000Mb
60GHz
2012 1999 2000 2001 2003 2004 2005 2007 2008 2009 2010 2011
MAC Improvements 802.11e
Wi-Fi
Quality of
Service
802.11k
Radio
Resouce
Mgmt
802.11v
Wireless
Network
Mgmt
802.11r
Fast
Roaming
802.11w
Protected
Mgmt
Frames
802.11af
TV
White
Space
802.11u
External
Network
Interface
802.11n –Draft
150Mb 2.4GHz
300-Mb 5GHz
802.11s
Mesh
© 2011 Xirrus, Inc. All Rights Reserved.
Wi-Fi Basics: Bands & Channels
• Two frequency bands are used in Wi-Fi
• 2.4GHz – used by 802.11b/g/n clients
• 3 non-overlapping channels
• Limited bandwidth, prone to interference
• 5GHz – used by 802.11a/n clients
• 24 non-overlapping channels (differs by geo region)
• 8X the bandwidth, Less potential for interference
© 2011 Xirrus, Inc. All Rights Reserved.
2.4GHz 5GHz
Wi-Fi Basics: Clients
2.4Ghz Only 5Ghz Capable
© 2011 Xirrus, Inc. All Rights Reserved.
Traditional Wi-Fi Solutions
• Thin APs with 2 Fixed State Radios
• 1 - 2.4Ghz
• 1 - 5Ghz
• Centralized Controller
© 2011 Xirrus, Inc. All Rights Reserved.
Traditional Access Point Evolution
© 2011 Xirrus, Inc. All Rights Reserved.
• 1st Generation • Single Radio, omni antenna, independent
• 2.4GHz channel only, 802.11bg
• This is most likely in your house and works fine there!
• 2nd Generation • Dual Radios, omni antennas, dependent
• One 2.4Ghz radio and one 5Ghz radio, 802.11abg
• Relies on centralized controller
• 3rd Generation • Still dual Radios, omni antennas, dependent
• Still one each 2.4GHz and 5GHz radios, 802.11abgn
Capacity Planning – a lost art in Wi-Fi
Total Theoretical Bandwidth = 450Mb
2 Radios used
75 Devices Per Radio
3 Mb (theoretical) per Device
Traditional Wi-Fi Design
1 (2.4GHz)
108 & 112 (5 GHz)
Project Specifications: 150 devices, 20% growth
Total Bandwidth = 196,608Mb
192 Ports (150 Used)
1 Device Per Port
1 Gb per Device
Wired Design
48 Ports
10/100/1000 48 Ports
10/100/1000
48 Ports
10/100/1000 48 Ports
10/100/1000
© 2011 Xirrus, Inc. All Rights Reserved.
Capacity Planning – Actual Throughput per Radio
© 2011 Xirrus, Inc. All Rights Reserved.
Capacity Planning – a lost art in Wi-FI
Usable Bandwidth = 60Mb (20Mb + 40Mb)
2 Radios used
75 Devices Per Radio
.4 Mb Per Device
Traditional Wi-Fi Design
1 (2.4GHz)
108 & 112
Total Bandwidth = 196,608Mb
192 Ports (150 Used)
1 Device Per Port
1 Gb Per Device
Wired Design
48 Ports
10/100/1000 48 Ports
10/100/1000
48 Ports
10/100/1000 48 Ports
10/100/1000
Project Specifications: 150 devices, 20% growth
© 2011 Xirrus, Inc. All Rights Reserved.
Capacity Planning – a lost art in Wi-FI
Usable Bandwidth = 300Mb (60Mb + 240Mb)
9 Radios used (3 Unused)
17 Devices Per Radio
2 Mb Per Device
2.4GHz Disabled
136 & 140 2.4GHz Disabled
36 & 40
1 (2.4GHz)
108 & 112
6 (2.4GHz)
44 & 48
2.4GHz Disabled
120 & 124 11 (2.4GHz)
52 & 56
Traditional Wi-Fi Design
Total Bandwidth = 196,608Mb
192 Ports (150 Used)
1 Device Per Port
1 Gb Per Device
Wired Design
48 Ports
10/100/1000 48 Ports
10/100/1000
48 Ports
10/100/1000 48 Ports
10/100/1000
Project Specifications: 150 devices, 20% growth
© 2011 Xirrus, Inc. All Rights Reserved.
Access Points
Xirrus Presents a New Approach
Wi-Fi Array
© 2011 Xirrus, Inc. All Rights Reserved.
15
Arrays Address Capacity and Density Like Cellular
Thin APs + Controller
• Short to medium range
• 1 or 2 radios per cell
• Centralized switching in the core
Multi-Radio Array
• Longer range
• Many radios per cell
• Distributed switching at the edge
© 2011 Xirrus, Inc. All Rights Reserved.
Learning From Cellular Network Evolution
From the first cellular networks of the 1980’s to today…
• Coverage expanded significantly
• Capacity increased significantly
• Device densities exploded
To handle the growth, cellular providers…
• Increased radios per base station
• Moved from omni to directional antennas
• Utilized additional channels of spectrum
© 2011 Xirrus, Inc. All Rights Reserved.
Results - Increased throughput per radio
© 2011 Xirrus, Inc. All Rights Reserved.
Wi-Fi Capacity Planning with Xirrus
Xirrus XN8
Usable Bandwidth = 680Mb (180Mb + 500Mb)
8 Radios, all used
19 Devices Per Radio
4.5 Mb Per Device
1
(2.4GHz)
44 & 48
136 &140
6 (2.4Ghz)
11 (2.4 Ghz)
108 & 112
52 & 56
120 & 124
Usable Bandwidth = 300Mb (60Mb + 240Mb)
9 Radios used (3 Unused)
17 Devices Per Radio
2 Mb Per Device
2.4GHz Disabled
136 & 140 2.4GHz Disabled
36 & 40
1 (2.4GHz)
108 & 112
6 (2.4GHz)
44 & 48
2.4GHz Disabled
120 & 124 11 (2.4GHz)
52 & 56
Traditional Wi-Fi Design
Project Specifications: 150 devices, 20% growth
© 2011 Xirrus, Inc. All Rights Reserved.
Wi-Fi Capacity Planning with Xirrus
Xirrus XN12
Usable Bandwidth = 1080Mb (180Mb + 900Mb)
12 Radios, all used
13 Devices Per Radio
7.2 Mb Per Device
1
(2.4GHz)
44 & 48
136 &140
6 (2.4Ghz)
11 (2.4 Ghz)
108 & 112
52 & 56
120 & 124
Usable Bandwidth = 420Mb (60Mb + 360Mb)
12 Radios used (6 Unused)
13 Devices Per Radio
2.8 Mb Per Device
2.4GHz Disabled
136 & 140 2.4GHz Disabled
36 & 40
1 (2.4GHz)
108 & 112
6 (2.4GHz)
44 & 48
2.4GHz Disabled
120 & 124 11 (2.4GHz)
52 & 56
Traditional Wi-Fi Design
36 & 40 60 & 64
100 & 104 128 & 132
Project Specifications: 150 devices, 20% growth
2.4GHz Disabled
128 & 132
2.4GHz Disabled
100 & 104
2.4GHz Disabled
60 & 64
© 2011 Xirrus, Inc. All Rights Reserved.
Things to Consider
• With proper planning you can dramatically lower your network spend
while enabling a wired like experience for the device explosion
• It used to be “switch where you can, route where you must”
• Xirrus says “Wi-Fi where you can, wire only where you must”
© 2011 Xirrus, Inc. All Rights Reserved.
Thank You
© 2011 Xirrus, Inc. All Rights Reserved.
Thank you!
Paul Kersse Area Vice President
Xirrus, Inc.
Q&A