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Cisco IOS Software Configuration Guide

for Cisco Aironet Access Points

Cisco IOS Releases 12.4(10b)JA and 12.3(8)JEC

May 2010

Text Part Number: OL-14209-01

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STATEMENTS, INFORMATION, AND RECOMMENDATIONS IN THIS MANUAL ARE BELIEVED TO BE ACCURATE BUT ARE PRESENTED WITHOUT

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OR LIMITED WARRANTY, CONTACT YOUR CISCO REPRESENTATIVE FOR A COPY.

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Cisco IOS Software Configuration Guide for Cisco Aironet Access Points

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Cisco IOS Software Configuration Guide for Cisco Aironet Access Points

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CONTENTS

Preface xix

Audience 1-xix

Purpose 1-xix

Organization 1-xx

Conventions 1-xxi

Related Publications 1-xxiii

Obtaining Documentation, Obtaining Support, and Security Guidelines 1-xxiv

Overview 1-1

Features 1-2

Features Introduced in This Release 1-2

Management Options 1-2

Roaming Client Devices 1-3

Network Configuration Examples 1-3

Root Access Point 1-3

Repeater Access Point 1-4

Bridges 1-5

Workgroup Bridge 1-5

Central Unit in an All-Wireless Network 1-6

Using the Web-Browser Interface 2-1

Using the Web-Browser Interface for the First Time 2-3

Using the Management Pages in the Web-Browser Interface 2-3

Using Action Buttons 2-4

Character Restrictions in Entry Fields 2-5

Enabling HTTPS for Secure Browsing 2-5

CLI Configuration Example 2-13

Deleting an HTTPS Certificate 2-13

Using Online Help 2-14

Changing the Location of Help Files 2-14

Disabling the Web-Browser Interface 2-15

Contents

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Using the Command-Line Interface 3-1

Cisco IOS Command Modes 3-2

Getting Help 3-3

Abbreviating Commands 3-3

Using no and default Forms of Commands 3-4

Understanding CLI Messages 3-4

Using Command History 3-4

Changing the Command History Buffer Size 3-5

Recalling Commands 3-5

Disabling the Command History Feature 3-5

Using Editing Features 3-6

Enabling and Disabling Editing Features 3-6

Editing Commands Through Keystrokes 3-6

Editing Command Lines that Wrap 3-7

Searching and Filtering Output of show and more Commands 3-8

Accessing the CLI 3-9

Opening the CLI with Telnet 3-9

Opening the CLI with Secure Shell 3-9

Configuring the Access Point for the First Time 4-1

Before You Start 4-2

Resetting the Device to Default Settings 4-2

Resetting to Default Settings Using the MODE Button 4-2

Resetting to Default Settings Using the GUI 4-2

Resetting to Default Settings Using the CLI 4-3

Obtaining and Assigning an IP Address 4-4

Default IP Address Behavior 4-4

Connecting to the 1100 Series Access Point Locally 4-5

Connecting to the 1130 Series Access Point Locally 4-6

Connecting to the 1200, 1230, 1240, and 1250 Series Access Points Locally 4-6

Connecting to the 1300 Series Access Point/Bridge Locally 4-7

Default Radio Settings 4-7

Assigning Basic Settings 4-8

Default Settings on the Express Setup Page 4-14

Configuring Basic Security Settings 4-16

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Understanding Express Security Settings 4-18

Using VLANs 4-18

Express Security Types 4-19

Express Security Limitations 4-21

Using the Express Security Page 4-21

CLI Configuration Examples 4-22

Configuring System Power Settings for 1130 and 1240 Series Access Points 4-27

Assigning an IP Address Using the CLI 4-28

Using a Telnet Session to Access the CLI 4-28

Configuring the 802.1X Supplicant 4-29

Creating a Credentials Profile 4-29

Applying the Credentials to an Interface or SSID 4-30

Applying the Credentials Profile to the Wired Port 4-30

Applying the Credentials Profile to an SSID Used For the Uplink 4-31

Creating and Applying EAP Method Profiles 4-32

Administering the Access PointWireless Device Access 5-1

Disabling the Mode Button 5-2

Preventing Unauthorized Access to Your Access Point 5-3

Protecting Access to Privileged EXEC Commands 5-3

Default Password and Privilege Level Configuration 5-4

Setting or Changing a Static Enable Password 5-4

Protecting Enable and Enable Secret Passwords with Encryption 5-6

Configuring Username and Password Pairs 5-7

Configuring Multiple Privilege Levels 5-8

Setting the Privilege Level for a Command 5-8

Logging Into and Exiting a Privilege Level 5-9

Controlling Access Point Access with RADIUS 5-9

Default RADIUS Configuration 5-10

Configuring RADIUS Login Authentication 5-10

Defining AAA Server Groups 5-12

Configuring RADIUS Authorization for User Privileged Access and

Network Services 5-14

Displaying the RADIUS Configuration 5-15

Controlling Access Point Access with TACACS+ 5-15

Default TACACS+ Configuration 5-15

Contents

Cisco IOS Software Configuration Guide for Cisco Aironet Access Points

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Configuring TACACS+ Login Authentication 5-15

Configuring TACACS+ Authorization for Privileged EXEC Access and Network Services 5-17

Displaying the TACACS+ Configuration 5-17

Configuring Ethernet Speed and Duplex Settings 5-18

Configuring the Access Point for Wireless Network Management 5-18

Configuring the Access Point for Local Authentication and Authorization 5-19

Configuring the Authentication Cache and Profile 5-20

Configuring the Access Point to Provide DHCP Service 5-22

Setting up the DHCP Server 5-22

Monitoring and Maintaining the DHCP Server Access Point 5-24

Show Commands 5-24

Clear Commands 5-25

Debug Command 5-25

Configuring the Access Point for Secure Shell 5-25

Understanding SSH 5-25

Configuring SSH 5-26

Configuring Client ARP Caching 5-26

Understanding Client ARP Caching 5-26

Optional ARP Caching 5-26

Configuring ARP Caching 5-27

Managing the System Time and Date 5-27

Understanding Simple Network Time Protocol 5-27

Configuring SNTP 5-28

Configuring Time and Date Manually 5-28

Setting the System Clock 5-28

Displaying the Time and Date Configuration 5-29

Configuring the Time Zone 5-29

Configuring Summer Time (Daylight Saving Time) 5-30

Defining HTTP Access 5-32

Configuring a System Name and Prompt 5-32

Default System Name and Prompt Configuration 5-32

Configuring a System Name 5-32

Understanding DNS 5-33

Default DNS Configuration 5-33

Setting Up DNS 5-34

Displaying the DNS Configuration 5-35

Creating a Banner 5-35

Contents

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Cisco IOS Software Configuration Guide for Cisco Aironet Access Points

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Default Banner Configuration 5-35

Configuring a Message-of-the-Day Login Banner 5-35

Configuring a Login Banner 5-37

Upgrading Autonomous Cisco Aironet Access Points to Lightweight Mode 5-37

Migrating to Japan W52 Domain 5-37

Verifying the Migration 5-39

Configuring Multiple VLAN and Rate Limiting for Point-to-Multipoint Bridging 5-39

CLI Command 5-40

Configuring Radio Settings 6-1

Enabling the Radio Interface 6-2

Configuring the Role in Radio Network 6-2

Universal Workgroup Bridge Mode 6-5

Configuring Dual-Radio Fallback 6-5

Radio Tracking 6-6

Fast Ethernet Tracking 6-6

MAC-Address Tracking 6-6

Bridge Features Not Supported 6-7

Configuring Radio Data Rates 6-7

Access Points Send Multicast and Management Frames at Highest Basic Rate 6-8

Configuring MCS Rates 6-10

Configuring Radio Transmit Power 6-11

Limiting the Power Level for Associated Client Devices 6-13

Configuring Radio Channel Settings 6-14

802.11n Channel Widths 6-15

Dynamic Frequency Selection 6-16

CLI Commands 6-18

Confirming that DFS is Enabled 6-18

Configuring a Channel 6-19

Blocking Channels from DFS Selection 6-19

Setting the 802.11n Guard Interval 6-20

Configuring Location-Based Services 6-21

Understanding Location-Based Services 6-21

Configuring LBS on Access Points 6-21

Enabling and Disabling World Mode 6-22

Contents

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Cisco IOS Software Configuration Guide for Cisco Aironet Access Points

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Disabling and Enabling Short Radio Preambles 6-23

Configuring Transmit and Receive Antennas 6-24

Enabling and Disabling Gratuitous Probe Response 6-25

Disabling and Enabling Aironet Extensions 6-26

Configuring the Ethernet Encapsulation Transformation Method 6-27

Enabling and Disabling Reliable Multicast to Workgroup Bridges 6-28

Enabling and Disabling Public Secure Packet Forwarding 6-29

Configuring Protected Ports 6-30

Configuring the Beacon Period and the DTIM 6-30

Configure RTS Threshold and Retries 6-31

Configuring the Maximum Data Retries 6-32

Configuring the Fragmentation Threshold 6-32

Enabling Short Slot Time for 802.11g Radios 6-33

Performing a Carrier Busy Test 6-33

Configuring VoIP Packet Handling 6-33

Viewing VoWLAN Metrics 6-34

Viewing Voice Reports 6-34

Viewing Wireless Client Reports 6-37

Viewing Voice Fault Summary 6-38

Configuring Voice QoS Settings 6-38

Configuring Voice Fault Settings 6-39

Configuring Multiple SSIDs 7-1

Understanding Multiple SSIDs 7-2

Effect of Software Versions on SSIDs 7-2

Configuring Multiple SSIDs 7-4

Default SSID Configuration 7-4

Creating an SSID Globally 7-4

Viewing SSIDs Configured Globally 7-6

Using Spaces in SSIDs 7-6

Using a RADIUS Server to Restrict SSIDs 7-7

Configuring Multiple Basic SSIDs 7-8

Requirements for Configuring Multiple BSSIDs 7-8

Guidelines for Using Multiple BSSIDs 7-8

Configuring Multiple BSSIDs 7-8

CLI Configuration Example 7-10

Contents

Cisco IOS Software Configuration Guide for Cisco Aironet Access Points

OL-14209-01

Displaying Configured BSSIDs 7-10

Assigning IP Redirection for an SSID 7-11

Guidelines for Using IP Redirection 7-12

Configuring IP Redirection 7-12

Including an SSID in an SSIDL IE 7-13

NAC Support for MBSSID 7-13

Configuring NAC for MBSSID 7-16

Configuring Spanning Tree Protocol 8-1

Understanding Spanning Tree Protocol 8-2

STP Overview 8-2

1300 and 350 Series Bridge Interoperability 8-3

Access Point/Bridge Protocol Data Units 8-3

Election of the Spanning-Tree Root 8-4

Spanning-Tree Timers 8-5

Creating the Spanning-Tree Topology 8-5

Spanning-Tree Interface States 8-5

Blocking State 8-7

Listening State 8-7

Learning State 8-7

Forwarding State 8-8

Disabled State 8-8

Configuring STP Features 8-8

Default STP Configuration 8-8

Configuring STP Settings 8-9

STP Configuration Examples 8-10

Root Bridge Without VLANs 8-10

Non-Root Bridge Without VLANs 8-11

Root Bridge with VLANs 8-11

Non-Root Bridge with VLANs 8-13

Displaying Spanning-Tree Status 8-14

Configuring an Access Point as a Local Authenticator 9-1

Understanding Local Authentication 9-2

Configuring a Local Authenticator 9-2

Guidelines for Local Authenticators 9-3

Configuration Overview 9-3

Contents

Cisco IOS Software Configuration Guide for Cisco Aironet Access Points

OL-14209-01

Configuring the Local Authenticator Access Point 9-3

Configuring Other Access Points to Use the Local Authenticator 9-6

Configuring EAP-FAST Settings 9-7

Configuring PAC Settings 9-7

Configuring an Authority ID 9-8

Configuring Server Keys 9-8

Possible PAC Failures Caused by Access Point Clock 9-8

Limiting the Local Authenticator to One Authentication Type 9-9

Unblocking Locked Usernames 9-9

Viewing Local Authenticator Statistics 9-9

Using Debug Messages 9-11

Configuring Cipher Suites and WEP 10-1

Understanding Cipher Suites and WEP 10-2

Configuring Cipher Suites and WEP 10-3

Creating WEP Keys 10-3

WEP Key Restrictions 10-5

Example WEP Key Setup 10-5

Enabling Cipher Suites and WEP 10-6

Matching Cipher Suites with WPA and CCKM 10-7

Enabling and Disabling Broadcast Key Rotation 10-7

Configuring Authentication Types 11-1

Understanding Authentication Types 11-2

Open Authentication to the Access Point 11-2

Shared Key Authentication to the Access Point 11-3

EAP Authentication to the Network 11-4

MAC Address Authentication to the Network 11-5

Combining MAC-Based, EAP, and Open Authentication 11-6

Using CCKM for Authenticated Clients 11-6

Using WPA Key Management 11-7

Software and Firmware Requirements for WPA, CCKM, CKIP, and WPA-TKIP 11-8

Configuring Authentication Types 11-10

Assigning Authentication Types to an SSID 11-10

Configuring WPA Migration Mode 11-13

Configuring Additional WPA Settings 11-14

Configuring MAC Authentication Caching 11-15

Configuring Authentication Holdoffs, Timeouts, and Intervals 11-16

Creating and Applying EAP Method Profiles for the 802.1X Supplicant 11-17

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