802-11n slides-network computing

8/7/2019 802-11n slides-network computing

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Enterprise 802.11n: Navigating a Minefield of

Opportunities

A Network Computing Editorial Perspectives Webcast

Sponsored by

Wednesday, January 16, 20089:00 AM PT / 12:00 PM ET

WELCOMEWELCOME


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Dave Molta , Editor at Large, Network Computing

Keerti Melkote , Founder, Products andPartnerships

Our Distinguished PanelOur Distinguished Panel


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Enterprise 802.11n:Navigating a Minefield of Opportunities

Dave MoltaNetwork ComputingSyracuse University

WELCOMEWELCOME


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Technology in Brief

The promise Higher speed: 5-10X that of 802.11ag

Enhanced reliability: fewer dropped packets Greater rate versus range: 11n and 11ag

Key technology enhancements MIMO 40 MHz channels MAC efficiency: Packet aggregation and block

acknowledgements Enhanced power save


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Standards Update

802.11n draft 3.0 approved by TGn working group inNovember, 2007

85% vote 884 comments compared to 6700 for Draft 1.0 and 3,076 for

Draft 2.0

Final approval now projected for March, 2009Wi-Fi Alliance

Certification provides basic guarantee of interoperability Database lists 179 11n-certified products as of 1/6/08

Risk of fundamental incompatibilities with the finalstandard is low but vendors unlikely to offer guarantees


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Market Overview

Silicon Highly competitive markets: Atheros, Broadcom, Intel, Marvel Second generation 11n silicon emerging

Consumer 3Q07 (DellOro): Draft-N products represented 13% of unit shipments; 22% of

revenues $100 price barrier has been broken for 11n wireless routers Some vendors embracing 5 GHz, especially for multimedia

Enterprise Vendors are delivering products in advance of the final ratification of the

standard Colleges and Universities highlighted as early adopters


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802.11n Client Devices

Demand for enterprise 11n infrastructure is driven in large part bythe transition of clients to 11n

Full benefits of 11n cannot be achieved with legacy abg clients

Enterprise notebook computer refresh cycles are typically 3-4 years 11n has not yet become the default WLAN interface in todays market~ Dell Large Business Notebooks: The most current Latitude

and Precision lines do not include 11n by default but it isoffered as a $20 upgrade

~ Lenovo Medium Large Enterprise: 11n is offered on selectmodels of the ThinkPad R, T, and X series~ On CDW, none of the three highlighted notebooks for

enterprise included 11n by default, though 9 of the 18 HPnotebooks offered included 11n

Over time, non-notebook clients, including dual-mode smartphones,will evolve to 11n, but its not clear how quickly the price and power issues will be addressed


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Spectrum Utilization Issues

Today: Its an 11g world Most current enterprise WLANs have been designed primarily

for coverage and compatibility rather than capacity Many enterprises have embraced dual-radio, 802.11ag

Future enterprise WLANs will leverage all availableunlicensed spectrum

2.4 GHz: 3 non-overlapping 20 MHz channels 5 GHz: Up to 22 non-overlapping 20 MHz channels (11 40

MHz channels) with dynamic frequency selection (DFS) Rate versus range for 5 GHz 11n approximates or exceeds 2.4

GHz 11g Legacy client support is a key transition issue


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11n AP Deployment Strategies

Greenfield Offers best performance New installations or those suitable for rip-and-replace upgrade of

clients and APs May need to accommodate specialized devices that only support bg

Overlay Existing APs remain in place with additional 11n APs added based

on new site survey Works best with 5 GHz 11n overlay to 2.4 GHz 11bg network

~ New notebooks use 5 GHz 11n~ Legacy and highly mobile devices use 11g

AP Substitution Existing APs are replaced with 11n APs

Incremental substitution to meet capacity needs in key locations Provides lowest implementation costs if UTP is adequate May not result in optimal coverage design


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Network Capacity Issues

Network capacity issues A single 11n AP can process over 200 Mbps of traffic at the edge GigE connections from APs to edge/distribution switches is highly

desirable, though probably not absolutely necessary Upgrades to core network connections may be necessary, especially

if controllers are centralized Controller capacity issues

Deploying WLAN controllers at the core is efficient and convenient butmay introduce performance bottlenecks

11n is driving vendors to enhance their distributed controlarchitectures

~ Multi-tiered controller deployments~ More intelligence at the network edge~ Addressing remote/branch office needs


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Backwards Compatibility

Greenfield deployments are rare, backwardscompatibility is the norm

Issues surrounding the coexistence of 802.11b and 802.11ghave been well-documented

802.11n devices will not achieve optimal performance whencoexisting with 802.11g and 802.11a traffic

Coexistence issues will make 40 MHz channels difficult to

support at 2.4 GHz Expect very modest rate-versus-range improvements for 11ag

clients from maximum ratio combining (MRC) In many cases, the need to provide backwards

compatibility will make it tougher to justify the addedcosts of 11n


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Power over Ethernet

Enterprises have grown accustomed to running APsusing Power over Ethernet (PoE)

802.11n radios require more power than is provided by802.3af The 802.3at standard will eventually solve this problem

but todays pre-standard solutions are proprietarySome enterprise WLAN vendors promise to offer dual-

radio 11n APs that work with 802.3af Does that mean two concurrent 11n radios?

Do these solutions impose any radio configuration restrictionson users?


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Security Considerations

802.11n does not significantly alter best-practice WLANsecurity strategies

Adopt WPA/WPA2 and 802.1x Implement wireless security monitoring

Increased performance of 802.11n may stress capacityof VPN-based security and controller-based securityservices

An 802.11n pilot may provide a convenient venue for implementing a best-practice security model

Incremental implementation of 802.11n APs can providethe ability to detect 11n rogue APs


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Costs and Benefits of Early Deployment

Benefits Enhanced performance and capacity for demanding

environments Real World experience will help with subsequent

upgrades/rollouts Provides capability to detect rogue 11n APs Vendors may be willing to offer incentives

Visibility may enhance reputationCosts

Unproven functionality and reliability APs are likely to cost twice as much May require more controllers and expensive network upgrades The longer you wait, the easier it is


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Conclusions and Recommendations

802.11n represents the most significant advance in WLANs sincethe development of 802.11

802.11n allows enterprise to consider replacing Ethernet as aprimary network access mechanism Enterprise adoption plans should be developed based on real needsand an understanding of the broader 802.11 ecosystem

Pilot 11n implementations will provide real-world experience and anopportunity to consider alternative vendors

Early adoption may provide advantages to some enterprises but thetrue cost will be high

Consider internal policies that require 11n on all enterprise-purchased notebook computers


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Copyright 2008. Aruba Networks, Inc. All rights reserved

Implementing 802.11n NetworksImplementing 802.11n Networks


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Aruba At A GlanceAruba At A Glance Market Position

#2 worldwide in enterprise wireless LANs Market Capitalization

>$1 billion (NASDAQ: ARUN)Russell 2000 Index company

Customers>3,500

Chief Executive OfficerDominic Orr

Executive OfficesSunnyvale, California

Worldwide Presence130 countries

Employees>500


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Leveraging 802.11n Requires A System PerspectiveLeveraging 802.11n Requires A System Perspective

No single-point-of-bottlenecking No compromises to security or user access


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Aruba Offers A System SolutionAruba Offers A System Solution Family of Hardware-Based Multi-ServiceMobility Controllers

80Gbps Controller Capable of Scaling to Massive 802.11n Networks Centralized WLAN Architecture Makes Integration Easy Controller Clustering Enables Large-Scale Deployments Programmable Hardware-Based Services Delivers Flexibility

Family of High-Performance 3 x 3 MIMOAccess Points

Evolution to Higher Speeds with 802.11a/b/g/draft-n Support MIMO Capabilities Improve Reliability and Performance Powered From Existing POE Switches Lowering Migration Costs Built-in TPM Module Stores Encryption Keys in a Secure Vault

ArubaOS Operating Software 802.11n-Aware Adaptive Radio Management (ARM) Software Defined AP Services Including Mesh, Remote Access,

Sensor and WLAN Access Wired + Wireless Guest Access Services Support for New Controllers and Access Points


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Arubas 802.11n Adaptive Radio ManagementArubas 802.11n Adaptive Radio ManagementSingle-Channel Multi-Channel

L2-3Network Awareness

L4-7ApplicationAwareness

FatAP

SingleChannel AP

LightweightAP

Aruba Solution: Adaptive Radio Management Dynamically and continuously tunes the wireless LAN Automatically monitors the spectrum, selects best channel & power Minimizes contention and interference Balances traffic and maintains voice and video quality Offers fair access for slow/fast clients Self-heals if an access point fails

AdaptiveAP

ROBUSTNESS

PERFORM

ANCE


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ARM Supports All 802.11n Migration ScenariosARM Supports All 802.11n Migration Scenarios

New802.11n Access Points

Existing802.11a/g Access Points

PointSubstitution

Add capacityin high usage

areas

New802.11n Access Points

Existing802.11a/g Access Points

802.11nOverlay

Only somedevices need

higher capacity

New802.11n Access PointsOld802.11a/g Access Poi ntsretired

Network-WideSubstitution

Add capacityeverywhere


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Great Features, Less FillingGreat Features, Less Filling

5 pounds (2.3 kilos)

11 ounces (0.3 kilos)

3 x 3 MIMO Powered from standard 802.3af

over a single cable

MIPS CPU with hardware cryptoacceleration Software upgradable Redundancy - high availability

operation Integral, dual-band, high-gain,

omni-directional

Less than 1/3 the volume ofcompeting 802.11n access point Less than 1/8 the weight


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Introducing The Industrys First 80Gbps

Multi-Service Mobility Controller

Introducing The Industrys First 80Gbps

Multi-Service Mobility Controller

Integrated ServicesHardware-Based Controller Scales Up To 80Gbps10GE Wired Interconnects

Wireless Mesh Services

Network Access Control

Firewall/VPN Security

Wireless LAN Services

Wireless IDS Services

Wi-Fi Cellular Roaming

Multi-ServiceMobilityModule (M3)20Gbps Each


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POLL 1:How would it affect your purchasing decision if an802.11n access point could use your existing802.3af Power-over-Ethernet power source?

Strong positive impact -----Modest position impact -----

Neutral -----Modest negative impact -----Strong negative impact -----


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Designed For Speed From The Silicon UpDesigned For Speed From The Silicon Up

2 x 10GEExternal

Ports

20Gbps

20Gbps

10 x 1GEExternal

Ports

ArubaMobility Processor

Multi-CoreNetwork Processor

Non-BlockingSwitch Fabric

Software-Based ServicesArubaOS Control PlaneArubaOS Data PlaneCentralized Crypto 8 CP, 24 DP Threads 4 Crypto Cores

Performance 3 Million PPS 20 Gbps Clear-text

Hardware-BasedServicesPolicy EnforcementStateful Firewall, NATIP Forwarding, BridgingData Plane Acceleration

Performance15 Million PPS20 Gbps Clear-text

Connectivity Options2 XFP Ports for 10GE Connectivity10 SFP Ports for GE Connectivity

CRYPTO

CRYPTO

CRYPTO

CRYPTO

DP

DP

DP

DP

DP

DP

DP

DP

DP

DP

DP

DP

DP

DP

DP

DP

DP

DP

DP

DP

DP

DP

DP

DP

CP CP CP CP CP CP CP CP


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Concurrently Runs All Forwarding ArchitecturesConcurrently Runs All Forwarding Architectures

CentralizedForwarding

DistributedForwarding

Split TunnelForwarding

Remote MeshForwarding

Internet InternetEthernet

ControlOnly

Data Center

LocalServices

IP Network

Split control and dataplanes to meet applicationand site requirements


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Copyright 2008. Aruba Networks, Inc. All rights reserved 27

Mid-SizedBranch

DMZNetwork

Wide AreaNetwork

Internet

SmallOffice

The Net Result: A High Performance SystemThe Net Result: A High Performance System

HomeOffice

Layer 2tunnelsallows voiceand multicastapplications

10GE capablecore networkinterconnects

80Gbpshardware-basedWLAN controller

802.11noptimizedadaptive radiomanagement

Standard PoE(802.3af) for

3x3 MIMO AP

80Gbps policyenforcementstateful firewall

Identity-basedsecurity policyfollows usersfor consistentaccess and

roaming

Remote APconfigurationsupports 4x thenumber of Local

APs

SOHO APs canbe managed asthin APs


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Poll 2

How would it affect your purchasing decision if

an 802.11n solution could support all four listed forwarding architectures instead of requiring you to select only one?

Strong positive impact -----Modest position impact -----Neutral -----Modest negative impact -----Strong negative impact -----


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Competitive ComparisonCompetitive Comparison

SUP720

WISM

FWSMVPNSM

FWSMFWSM

WISMWISM

ESM

80Gbps Multi-ServiceMobility Controller SUP720

WISM

FWSMVPNSM

FWSMFWSM

WISMWISM

ESM

SUP720

WISM

FWSM

VPNSM

FWSMFWSM

WISMWISM

ESM

SUP720

WISM

FWSMVPNSM

FWSMFWSM

WISMWISM

ESM

SUP720

WISM

FWSMVPNSM

FWSMFWSM

WISMWISM

ESM

400 Watts Each

>2kW Each


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SummarySummary

A well designed 802.11n solution will allow enterprises to run an all-wireless workplace A fundamentally more flexible, more easily deployed alternative to Ethernet

Deployment considerations should include how much legacyinfrastructure power, cabling, edge, core you want to keep orreplace Retaining legacy clients Intel Centrino, 802.11b voice devices should

not impact performance Most users will migrate to 802.11n as clients and funding become

available A migration-friendly wireless LAN that can accommodate both old and new

infrastructure is highly desirable The 802.11n platform should be able to expand as needs grow

Throughput and processing should support WPA2-encrypted voice andstreaming video

The architecture should be both adaptable and scalable The infrastructure should adapt to your needs, not the other way around


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Poll 3Poll 3 How would you rank the importance of fewer appliances

and lower power consumption on your buying decision?

Strong positive impact ----- Modest position impact ----- Neutral -----

Modest negative impact ----- Strong negative impact -----


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The All-Wireless Workplace Is Now

Open For Business

www.arubanetworks.com

The All-Wireless Workplace Is Now

Open For Business www.arubanetworks.com


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Submit Your Questions NowSubmit Your Questions Now

Dave Molta , Editor at Large, Network Computing

Keerti Melkote , Founder, Products andPartnerships

Q & AQ & A


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ResourcesResources

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802-11n slides-network computing