High Density & Resilient WLAN Network - Cisco · enterprise networks • Number of devices supported will increase significantly and it is important to optimize the WLAN deployment

High Density & Resilient WLAN Network

Tjie Seng, Njauw CSE

Summer Olympic 2012

© 2010 Cisco and/or its affiliates. All rights reserved. 3

True HD WiFi

Deployment

Cisco Confidential 4 © 2013-2014 Cisco and/or its affi l iates. All rights reserved.


UK Venues


BoH Client Stats 28-29th July



The first Blackberry with email was released

• ~300M+ PCs

• ~100M+ Smartphones

• iPhone is unveiled

Smartphones surpassed

PC units sold

• ~600M+ Smartphones

• ~320M+ PCs

• ~iPad is unveiled

Tablets will surpass PC units sold

• ~1+ Billion Smartphones

• ~300M+ Tablets

• ~250M+ PCs

• 150+ Billion mobile

applications downloaded

Pro

du

ctivi

ty

2015 1997 2010 2007

Device Trends


Traffic Trends

By 2016, Fixed/Wi-Fi IP Traffic Surpasses Fixed/Wired IP Traffic

-

20,000

40,000

60,000

80,000

100,000

120,000

2011 2012 2013 2014 2015 2016

53%

40%

7%

Mobile Data (70% CAGR)

Fixed/Wired (20% CAGR)

Fixed/Wi-Fi (34% CAGR)

Source: Cisco VNI Global Mobile Data Traffic Forecast, 2012–2017

Pe

tabyte

s p

er

Mo

nth


Summarizing the Trend…

WiFi is no longer “nice to have” or “best effort” access for the end users

• Instead, WLAN is mission critical network component that has to be ubiquitous and available

There is a blurred line between wired and wireless access in the enterprise

• With advent of smart devices and BYOD, WLAN is now the first line of access with wireline access as a back up

Despite the benefits of BYOD, they bring a string of complexities in the enterprise networks

• Number of devices supported will increase significantly and it is important to optimize the WLAN deployment supporting high density environment

• Video is driving the network bandwidth requirement and it is critical to prioritize mission critical application over personal application in the enterprise environment


Channel Efficiency

• 802.11a,b,g,n,ac is CSMA/CA – collision avoidance

• CCA is Clear Channel Assessment – and is the listen before talk component of Collision Avoidance

• Range versus rate is something that we are generally working to maximize in a design - However

• In High Density Design, the reverse is actually true – we want to minimize the propagation of a cell

• Minimizing the cell size is a function of limiting the effective propagation –

• Limiting supported rates

• Managing the power of the radio

• Using the right antenna’s

• This will maximize channel re-use in a small space


Points to Consider 2.4GHz v/s 5GHz

12

3 non-overlapping channels in 2.4 GHz

‒That’s 1 (one) 100 Mbps FastEthernet

interface!

4-21 non-overlapping channels in 5 GHz

( Indonesia = 4 )

5 GHz will be critical to supporting High Density

5 GHz device support on the rise

Trend is towards faster refresh

Cisco Confidential 13 © 2013-2014 Cisco and/or its affi l iates. All rights reserved. Spectrum Is a Shared Finite Resource

Understand Protocol Selection 802.11 b/g/a/n and Duty Cycle—Important? Why?

13

Longer Time = Slower Transmission = Higher Duty Cycle = Lower Efficiency


Every SSID Counts!

14

Each SSID requires a separate Beacon

Each SSID will advertise at the minimum mandatory data rate

Disabled – not available to a client

Supported – available to Existing associated client

Mandatory – Client must support to associate

Lowest mandatory rate is beacon rate

Highest mandatory rate is default mcast rate


• Capacity by coverage area becomes a DATA RATE and TRANSMIT POWER configuration issue.

• Faster data rates = smaller cells

• Lower transmit powers = smaller cells

• Smaller cells = more cells = more calls in a coverage area

Designing High Density Cell


Channel Utilization – Beacon Speed Made the Difference?

What made this

dramatic

change?

Before

5% After


IMPROVED PERFORMANCE FOR ALL CLIENTS

Improve Downlink Performance for ALL DevicesAP , ClientLink with Beam Forming

MAXIMIZE SIGNAL STRENGTH

WHEREVER YOU ARE & AS YOU MOVE FOR 802.11a/g/n Clients

1S

71

1S

71

2S

300

3S

450

802.11a/g/

n


Test: 802.11a/g device measured at 16 antenna orientations w/ 802.11n network Source: Miercom

Client Link: Higher System Capacity

• Faster data transmission, less retries = more efficient use of RF channel.

• Faster 11a/g transactions opens airtime for 11n devices, providing them improved experience

Up to 27% Improvement in Channel Capacity

Channel Util of 74.2% Channel Util of 45.2%


Antenna Radiation Patterns

19

#CiscoPlusCA

Dipole Omni

Patch

Yagi

Antenna Choice Plays a Critical Part in Design for Proper Coverage


High Density Deployment

20

Example : Overhead Is Optimal Using Directional Antennas


2.4 GHz Patterns (AIR-ANT2566P4W-R )

High-Performance Mobile Infrastructure

Performance

of 802.11n 802.11ac

3x4 MIMO 3 Spatial Streams

Gigabit Wi-Fi • 802.11ac Performance

• Enterprise Class

CleanAir for 80Mhz RF Interference Detection

and Mitigation

HIGH DENSITY EXPERIENCE (HDX)

ClientLink 3.0 Increase Performance

and Range

Optimized Roaming Intelligent Handoff

in High Density

Turbo Performance More 802.11ac Clients per AP

Introducing Cisco Aironet 3700 & 2700 Series


Multi-Client Performance Performance

• With 802.11ac, the total bandwidth available to clients is increased to 1.3Gbps, but this is still a shared medium technology.

• An efficient packet scheduler designed for the needs of 802.11ac is needed to keep up with client counts of 60+ per radio.

• Cisco’s AP3700 provides on-radio caching technology which leverages additional RAM for per-client queuing techniques.

Traditional AP Design

DRAM

(512Mb) CPU

Radio – 2.4GHz

Radio – 5GHz

Enterprise AP Design

DRAM

(512Mb)

CPU 800 MHz

4x4 Antennas

for Reliability On-Radio Cache

for Speed

Performance

CPU 512 MHz

DRAM (128Mb)

Radio – 5GHz

CPU 384 MHz

DRAM (128Mb)

Radio – 2.4GHz


Multi-Client performance numbers

Miercom Report:

http://www.cisco.com/en/US/prod/collateral/wireless/ps5678/ps13367/miercom-report-cisco-ap-3702i.pdf

Performance












CiscoLive London 2013

• 22 3502P’s mounted overhead

• 22 with 2.4Ghz enabled

• 24 Mbps first mandatory data rate

• 4500 seats – 30-40% take rate expected

• Everybody was a hero

• Used Grayling -30°

• Rail height was 12 M (38 ft)

• No closer that 30 Ft, no farther than 100 Ft


CISCO MERAKI CENTRALISED CONVERGED

• Centralised control plane • Distributed data plane • Common LAN & WLAN OS • LAN and WLAN feature

consistency • No controller at remote sites • Optimised for distributed

enterprise or branch deployments

• Centralised control plane • Distributed data plane • Data centre hosted

controller • No controller at remote sites • Optimised for distributed


• Centralised control plane • Centralised data plane • Premise-based controller • Controller at every location • Optimised for campus

deployments

• Centralised control plane • Distributed data plane • Common LAN & WLAN OS • LAN & WLAN feature

consistency • Controller at every location • Optimised for distributed


• Centralised control plane • Centralised OR distributed

data plane • Premise-based OR data

centre controller • Controller at every location • Optimised for campus

deployments

• MR Access Points • MS switches • MX security • Dashboard

• Aironet Access Points • FlexConnect Controllers • Catalyst switches • Identity Services Engine • Mobility Services Engine • Prime Infrastructure

• Aironet Access Points • Centralised Controllers • Catalyst switches • Identity Services Engine • Mobility Services Engine • Prime Infrastructure

• Aironet Access Points • Catalyst 3850 Switch • Catalyst 3650 Switch • Catalyst 4500 Switch • Identity Services Engine • Mobility Services Engine • Prime Infrastructure

• Aironet Access Points • Centralised Controllers • Catalyst switches • Identity Services Engine • Mobility Services Engine • Prime Infrastructure

Internet

Internet or Intranet

Deployment Options

FLEXCONNECT MESH


Out of band cloud management

• Scalable

• Unlimited throughput, no bottlenecks

• Add devices or sites in minutes

• Reliable

• Highly available cloud with multiple datacenters

• Network functions even if connection to cloud is interrupted

• 99.99% uptime SLA

• Secure

• No user traffic passes through cloud

• Fully HIPAA / PCI compliant (level 1 certified)

• 3rd party security audits, daily penetration testing

Reliability and security information at meraki.cisco.com/trust

Management

data (1 kb/s)

WAN


Intuitive web-based dashboard

Wired +

wireless

Client

fingerprints

Application

QoS

Instant

search

Location

analytics

Real-time

control


Converged Access Switching WLAN Controllers

Catalyst 3850

WLAN Access Points

1600 2700 3600

Catalyst 4500-E w/ Sup. 8-E

Branch / Small Campus

2500 Virtual Controller

8500 5500 WiSM2 5760

7500

700W

Catalyst 3650

1530 & 1552

Cisco Unified Access Portfolio Leadership

3700


Standby WLC

Redundancy Link Established (Over dedicated Redundancy Port)

AP and Client info Sync Keep-Alive failure/Notify Peer

Client session intact. Does not re-associate

Client Associate

AP Join

AP session intact. Does not re-establish capwap

Effective downtime for client is Detection time + Switchover time

Switch

Redundancy Role Negotiation Active WLC


Controller Redundancy – Architecture Resilency

N:N:1 Redundancy N:N Redundancy

N:1 Redundancy Resiliency


3

2

FlexConnect Group: Local Backup RADIUS

• Normal authentication is done centrally

• On WAN failure, AP authenticates new clients with locally defined RADIUS server

• Existing connected clients stay connected

• Clients can roam with

• CCKM fast roaming, or

• Reauthentication

Backup Scenario

Remote Site

WAN

Central Site

FlexConnect Group 1

Central RADIUS

Local Backup

RADIUS

CCKM Fast Roaming


Controller

L3/L2 switch

Mesh Deployment Flexibility: LAN-to-LAN connectivity

Multiple hop backhaul

2.4 GHz and 5GHz wireless client access

Ethernet Access to wired clients

LAN-to-LAN in motion with Work Group Bridge (WGB)

2.4 GHz Access

5 GHz Access

MAP

(Mesh AP) RAP

(Root AP) Backhaul 5GHz

MAP

Backhaul 5GHz

WGB

5 GHz Access

Wired access

L2 switch

Cisco Outdoor Mesh architecture overview


WLAN

WLAN

RAP

RAP

Mesh Reliability and Failover

35 © 2013-2014 Cisco and/or its affi l iates. All rights reserved.

Uncompromised User Experience on Any Workspace

U n i f i e d A c c e s s One Policy

One Management

One Network


Introducing CleanAir

Cisco CleanAir

A system-wide feature that uses silicon-level intelligence to automatically mitigate the impact of wireless interference, optimize network performance and reduce troubleshooting costs

Cisco CleanAir Wi-Fi chipset

Spectral Resolution at 78 to 156 KHz

Po

wer


View of Video Interference


Zoom &

Pan Controls

Next-Gen Maps • Reduced Clutter • Faster Loading • Better Navigation • Scalable Vector

Graphics • High quality images

with zoom in/out

Design Site and Maps Hierarchy of Campuses, buildings and floors

Active

Rogue APs

802.11u location specific service

THANK YOU

Documents

High Density & Resilient WLAN Network - Cisco · enterprise networks • Number of devices supported will increase significantly and it is important to optimize the WLAN deployment