Cisco IOS Software Configuration Guide for Cisco Aironet Access ...

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Understanding WDS Chapter 12 Configuring WDS, Fast Secure Roaming, Radio Management, and Wireless Intrusion Detection Understanding WDS When you configure Wireless Domain Services on your network, access points on your wireless LAN use the WDS device (either an access point, an Integrated Services Router, or a switch configured as the WDS device) to provide fast, secure roaming for client devices and to participate in radio management. If you use a switch as the WDS device, the switch must be equipped with a Wireless LAN Services Module (WLSM). An access point configured as the WDS device supports up to 60 participating access points, an Integrated Services Router (ISR) configured as the WDS devices supports up to 100 participating access points, and a WLSM-equipped switch supports up to 600 participating access points and up to 240 mobility groups. Note A single access point supports up to 16 mobility groups. Fast, secure roaming provides rapid reauthentication when a client device roams from one access point to another, preventing delays in voice and other time-sensitive applications. Access points participating in radio management forward information about the radio environment (such as possible rogue access points and client associations and disassociations) to the WDS device. The WDS device aggregates the information and forwards it to a wireless LAN solution engine (WLSE) device on your network. Role of the WDS Device The WDS device performs several tasks on your wireless LAN: • Advertises its WDS capability and participates in electing the best WDS device for your wireless LAN. When you configure your wireless LAN for WDS, you set up one device as the main WDS candidate and one or more additional devices as backup WDS candidates. If the main WDS device goes off line, one of the backup WDS devices takes its place. • Authenticates all access points in the subnet and establishes a secure communication channel with each of them. • Collects radio data from access points in the subnet, aggregates the data, and forwards it to the WLSE device on your network. • Acts as a pass-through for all 802.1x-authenticated client devices associated to participating access points. • Registers all client devices in the subnet that use dynamic keying, establishes session keys for them, and caches their security credentials. When a client roams to another access point, the WDS device forwards the client’s security credentials to the new access point. Table 12-1 lists the number of participating access points supported by the platforms that can be configured as a WDS device: an access point, an ISR, or a WLSM-equipped switch. Table 12-1 Participating Access Points Supported by WDS Devices Unit Configured as WDS Device Participating Access Points Supported Access point that also serves client devices 30 Access point with radio interfaces disabled 60 12-2 Cisco IOS Software Configuration Guide for Cisco Aironet Access Points OL-8191-01
Chapter 12 Configuring WDS, Fast Secure Roaming, Radio Management, and Wireless Intrusion Detection Services Understanding Fast Secure Roaming Table 12-1 Participating Access Points Supported by WDS Devices (continued) Unit Configured as WDS Device Participating Access Points Supported Integrated Services Router (ISR) 100 (depending on ISR platform) WLSM-equipped switch 600 Role of Access Points Using the WDS Device The access points on your wireless LAN interact with the WDS device in these activities: • Discover and track the current WDS device and relay WDS advertisements to the wireless LAN. • Authenticate with the WDS device and establish a secure communication channel to the WDS device. • Register associated client devices with the WDS device. • Report radio data to the WDS device. Understanding Fast Secure Roaming Access points in many wireless LANs serve mobile client devices that roam from access point to access point throughout the installation. Some applications running on client devices require fast reassociation when they roam to a different access point. Voice applications, for example, require seamless roaming to prevent delays and gaps in conversation. During normal operation, LEAP-enabled client devices mutually authenticate with a new access point by performing a complete LEAP authentication, including communication with the main RADIUS server, as in Figure 12-1. OL-8191-01 Cisco IOS Software Configuration Guide for Cisco Aironet Access Points 12-3
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Cisco IOS Software Configuration Gu
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CONTENTS Preface xix Audience xix P
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Contents Opening the CLI with Secur
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Contents Optional ARP Caching 5-26
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Contents Guidelines for Using Multi
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Contents Applying an EAP Profile to
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Contents Assigning Names to VLANs 1
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Contents Verifying Repeater Operati
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Contents Displaying the Logging Con
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Preface Audience This guide is for
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Preface Conventions Appendix B, “
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Preface Related Publications ¡Adve
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Preface Documentation Feedback Cisc
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Preface Obtaining Technical Assista
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CHAPTER 1 Overview Cisco Aironet Ac
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Chapter 1 Overview Features WLSM Su
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Chapter 1 Overview Features VoWLAN
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Chapter 1 Overview Features • Wi-
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Chapter 1 Overview Management Optio
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Chapter 1 Overview Network Configur
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Chapter 1 Overview Network Configur
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CHAPTER 2 Using the Web-Browser Int
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Chapter 2 Using the Web-Browser Int
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CHAPTER 3 Using the Command-Line In
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Chapter 3 Using the Command-Line In
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CHAPTER 4 Configuring the Access Po
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Chapter 4 Configuring the Access Po
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CHAPTER 5 Administering the Access
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Chapter 5 Administering the Access
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CHAPTER 6 Configuring Radio Setting
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Chapter 6 Configuring Radio Setting
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CHAPTER 7 Configuring Multiple SSID
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Chapter 7 Configuring Multiple SSID
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CHAPTER 8 Configuring Spanning Tree
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Chapter 8 Configuring Spanning Tree
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Chapter 13 Configuring RADIUS and T
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CHAPTER 14 Configuring VLANs This c
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Chapter 14 Configuring VLANs Unders
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Chapter 14 Configuring VLANs Config
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Chapter 14 Configuring VLANs VLAN C
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Chapter 14 Configuring VLANs VLAN C
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CHAPTER 15 Configuring QoS This cha
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Chapter 15 Configuring QoS Understa
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Chapter 15 Configuring QoS Configur
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Chapter 15 Configuring QoS QoS Conf
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CHAPTER 16 Configuring Filters This
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Chapter 16 Configuring Filters Conf
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CHAPTER 17 Configuring CDP This cha
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Chapter 17 Configuring CDP Configur
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Chapter 17 Configuring CDP Monitori
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Chapter 17 Configuring CDP Monitori
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CHAPTER 18 Configuring SNMP This ch
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Chapter 18 Configuring SNMP Underst
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Chapter 18 Configuring SNMP Configu
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CHAPTER 19 Configuring Repeater and
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Chapter 19 Configuring Repeater and
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SP ED LED 1 5 2 6 3 7 4 8 1X 2X ETH
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20 CHAPTER Managing Firmware and Co
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Chapter 20 Managing Firmware and Co
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21 CHAPTER Configuring System Messa
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Chapter 21 Configuring System Messa
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22 CHAPTER Troubleshooting This cha
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Chapter 22 Troubleshooting Checking
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Chapter 22 Troubleshooting Resettin
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Chapter 22 Troubleshooting Reloadin
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APPENDIX A Protocol Filters The tab
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Appendix A Protocol Filters Table A
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Appendix A Protocol Filters Table A
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APPENDIX B Supported MIBs This appe
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APPENDIX C Error and Event Messages
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Appendix C Error and Event Messages
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GLOSSARY 802.11 The IEEE standard t
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Glossary dipole domain name DNS DSS
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Glossary roaming RP-TNC A feature o
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INDEX Numerics 1130AG series indica
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Index Telnet 4-9 terminal emulator
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Index reasons for 20-18 using FTP 2
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Index IP redirection 7-11, 7-12 IPS
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Index protected ports 6-25 protocol
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Index server groups 18-7 shutdown m
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Index tftp_init command 22-21 TFTP
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