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Controller-based Wireless LAN Fundamentals: An end-to-end reference guide to design, deploy, manage, and secure 802.11 wireless networks

by: Jeff Smith, Jake Woodhams, Robert Marg

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Publisher: CISCO PRESS,25.11.10

Category: Cisco Level:

ISBN: 1587058251
ISBN13: 9781587058257

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Features and Benefits

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The first end-to-end reference guide for every network professional who wants to design, deploy, or manage next-generation wireless networks


# Covers the principles and components of next-generation wireless networks built with Cisco wireless controllers and Cisco 802.11n AP
# Contains valuable tips, insights, and best practices for designing and implementing next generation networks, direct from Cisco experts with extensive first-hand experience
# Presents configuration examples for common deployment scenarios



Table of Contents

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Introduction

Chapter 1 The Need for Controller-Based Wireless Networks

Why Wireless LAN Controllers Were Created

Why You Need to Use a Wireless LAN Controller

Controller-Based WLAN Functional and Elemental Architecture

Autonomous AP Issues and the WLC Remedy


  Problem: WLAN APs Are Difficult to Deploy


  Problem: WLANs Are Not Secure


  Problem: Infrastructure Device Configuration and Scaling


          Problem: Autonomous AP Costs for Configuring Each AP


          Problem: Autonomous AP Costs for Keeping Each AP's Software Up to Date


          Problem: RF Expertise and Configuration Challenges

Mobility Applications Enabled by Controller-Based WLANs

WLANs Do Not Provide the Performance and Robustness Needed for Use as a Primary Access Network

Summary

Chapter 2 Wireless LAN Protocols

Understanding the Relevant Standards


  Wi-Fi Alliance


  Cisco Compatible Extensions


  IETF

The Physical Layer


  Physical Layer Concepts

CAPWAP


  CAPWAP Versus LWAPP


  CAPWAP Protocol Fundamentals


          CAPWAP Terminology


          CAPWAP Control Messages


          CAPWAP Data Messages


          CAPWAP State Machine


          CUWN Implementation of the CAPWAP Discovery


          CAPWAP Transport


  CAPWAP MAC Modes


          Split MAC Mode


          Local MAC Mode


  Summary of CAPWAP

Packet Flow in the Cisco Unified Wireless Network


  CAPWAP Control


  CAPWAP Data Path: Centrally Bridged Traffic


  CAPWAP Data Path: Locally Bridged Traffic

Summary of Packet Flow

Summary

References

Chapter 3 802.11n

IEEE 802.11n Standard


  802.11n MAC


  Other 802.11 Standards Used with 802.11n


  Frequency Bands Supported by 802.11n

Antenna Arrays


  Transmit Beam Forming (TxBF)


  Beam Steering


  Spatial Multiplexing


  Transmit Diversity

Multiple Input, Multiple Output (MIMO)


  Multipath


  MIMO Nomenclature


  Receiver Diversity


          Branch Selection Diversity


          Branch-Combining Diversity


          Diversity Antenna Array, Type, Orientation, and Spacing


  Transmit Beam-Forming Types


          Legacy Beam Forming


          Implicit Beam Forming


          Explicit Beam Forming


  MIMO Antenna Array Coverage and Placement

Coding


  Binary Convolutional Coding (BCC)


  Low-Density Parity Checking (LDPC)

HT PHY and Operation


  HT Mixed


  HT-Greenfield Format

Channel Bonding/40-MHz-Wide Channels


  Protection

Power Management

Packet Aggregation


  Bursting/Block ACK (BACK)


  Short Guard Interval (GI)


  Reduced Inter-Frame Spacing (RIFS)

Reverse Direction Protocol (RDP)

Modulation and Coding Schemes (MCS)

Configuration Requirements to Obtain HT Rates

Predicting 802.11 Link Performance

Summary

Chapter 4 Cisco Unified Wireless LAN Security Fundamentals

Understanding WLAN Security Challenges


  Vulnerabilities Inherent to the Radio Transmission Medium


          Physical Containment Problem


          Unlicensed Radio Spectrum Problem


  Vulnerabilities Inherent to the Standards Definitions


          Authentication and Encryption Weaknesses


          Unauthenticated Management Frames


  Vulnerabilities Inherent to Mobility


  Misconfigured Wireless Devices and Clients


  Rogue Access Points and Devices


  Readily Available Profiling and Attack Tools

Addressing the WLAN Security Challenges


  Background on Strong Authentication and Privacy


          How WEP Encryption Works


          How WEP Is Broken


          802.11 Authentication


  Addressing the Strong Authentication and Privacy Challenges


          Authentication Framework


          Authentication Algorithm


          Data Privacy and Integrity


          Alternative Approaches to Authentication and Data Privacy


  Rogue Access Point Detection and Wireless Intrusion Prevention


  Secure Management and Security Policies

Summary

References

Chapter 5 Design Considerations

100 Percent Wireless Access Layer


  Client Device Power


  RF Vulnerability


  Volume of Network Traffic

Increased and Difficult WLAN Coverage Requirements


  Elevators


          External Bleed-Through


          Elevator Shaft Coverage


          Access Point Installed in Elevator Car

Continuous Availability and Outage Planning


  Power Loss


          Equipment Failures: APs, WLCs, and Backhaul Network


  RF Interference


          Denial of Service Attacks


          Business Operation Continuity in the WLAN Era

Power Conservation

Flexibility

WLAN Capacity

Summary

Chapter 6 Cisco Unified Wireless LAN Architectures

Cisco Unified Wireless LAN Architecture Review

Architectural Flexibility, Scalability, and Resiliency


  Architectural Flexibility


  Architectural Resiliency


          N:1 WLC Redundancy


          N:N WLC Redundancy


          N:N:1 WLC Redundancy


  Architectural Scalability


          Mobility


          Mobility Domains

Campus Architectures


  Enterprise Wiring Closet Deployment


  Enterprise Distribution Layer Deployment


  Data Center or Services Block Deployments


  Campus HREAP

Branch Architectures


  Distributed Branch Controller Placement


  Centralized Controller Placement with HREAP


  Office Extend AP (OEAP)

Summary

Chapter 7 Troubleshooting

Tools for Troubleshooting 802.11 Wireless Networks


  Wireless LAN Controller Command-Line Interface


  Wireless Control System (WCS)


  Wireless Protocol Analyzer


  Spectrum Analyzers

Isolating Issues on the Cisco Unified Wireless Network


  Protocol/Network Issues


          LWAPP/CAPWAP Discovery Process


          Troubleshooting the LWAPP CAPWAP Discovery Process


          Network Considerations


  Client Troubleshooting


          Troubleshooting Client Issues Using the WLC CLI


          Troubleshooting Client Issues Using WCS


          Common Client Problems and Solutions

The Wireless Medium: Troubleshooting Performance-Related Issues


  Coverage and Interference Issues


          Detecting, Isolating, and Solving Coverage Issues


          Detecting, Isolating, and Solving Interference Issues

Troubleshooting Advanced Wireless LAN Services


  Voice over WLAN


          Voice over WLAN Challenges


          Troubleshooting VoWLAN


  Location Troubleshooting


          Troubleshooting Location Accuracy

Summary

Chapter 8 Introduction to WCS

Designing Wireless Networks with WCS


  WCS Requirements


  WCS Interface


  WCS Monitoring


          Maps


          Controllers and AP Monitor


          Client Monitoring


  WCS Reporting


  WCS Configuration


          Controller Configuration Templates


          WCS Configuration and Template Auditing


          AP Configuration Templates


  WCS Services


  WCS Administration


          Role-Based Access Control (RBAC)


          WCS Virtual Domains


          WCS License Center

Additional Benefits of WCS: Planning and Calibration Tools


  WCS Planning


  WCS Calibration

Summary

Chapter 9 Next-Generation Advanced Topics: Multicast

Multicast


  Multicast Definition


  Multicast Addressing


  Multicast Forwarding


          Multicast Distribution Trees


          Protocol Independent Multicasting (PIM)


          IGMP

Multicast Configuration in the CUWN


  Access Point-to-Client Delivery


  Client-to-Access Point Delivery


  Enabling Multicast on a Cisco WLAN Controller


          MGIDs


  Multicast Mobility Messaging


  Enabling Multicast on a Cisco Router or Layer 3 Switch

VideoStream


  Principles of VideoStream


          Multicast Reliability


          QoS


  Configuring VideoStream on the WLC

Additional Design Recommendations


  Wireless Multicast Roaming


  Wireless CAPWAP Fragmentation


  All WLCs Have the Same CAPWAP Multicast Group Address


  WLC Placement

Summary

9781587058257


  TOC


  10/11/2010



About the Authors

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Jeff Smith is a wireless consulting systems engineer in the Cisco Systems Borderless Networking Organization. His 25 years of experience include the planning, analysis, design, implementation, installation, and support of numerous wireless network-based solutions for enterprises, municipalities, hospitals, universities, airports, warehouses, mines, and product manufacturers worldwide. He has developed and instructed dozens of training courses on wireless networking topics. Prior to joining Cisco Systems, Jeff was an early employee at several wireless and security startup companies. Jeff's education includes a bachelor's degree in electrical engineering and a master's degree in telecommunications with emphasis on wireless communications. Jeff's certifications include CWNE (Certified Wireless Network Expert), IEEE WCET (Wireless Communications Engineering Technology Certification), and CISSP (Certified Information Systems Security Professional).

Jake Woodhams is a senior manager of technical marketing in the Cisco Wireless Networking Business Unit. In this role, he is responsible for technical product definition and systems architecture, focusing on Cisco Unified Wireless LAN architecture. He hass been working with wireless technology at Cisco for seven years and has an intimate knowledge of the protocols and products in the Cisco wireless portfolio. As a writer, he's the author of numerous white papers and design and deployment guides as well as several contributed articles.

Robert Marg is a wireless consulting systems engineer in the Cisco Systems Borderless Networks Organization. As a technical leader in wireless, Robert is responsible for planning, designing, and supporting numerous wireless network-based solutions for enterprises, hospitals, universities, manufacturers, and K-12 customers. Prior to his role as a wireless consulting systems engineer, Robert spent time as a member of the federal, public sector, enterprise, and commercial sales organizations as a systems engineer, helping customers solve business challenges with technical solutions. Mr. Marg holds a bachelor's degree in bacteriology from the University of Wisconsin-Madison. As a writer, Robert has been the author of numerous white papers and a technical editor for the Cisco Press CCNA Exam Certification Guide.