Cisco IOS Software Configuration Guide for Cisco Aironet Access Points

Transcription

1 Cisco IOS Software Configuration Guide for Cisco Aironet Access Points Cisco IOS Release 12.2(15)JA April 2004 Corporate Headquarters Cisco Systems, Inc. 170 West Tasman Drive San Jose, CA USA Tel: NETS (6387) Fax: Text Part Number:

2 THE SPECIFICATIONS AND INFORMATION REGARDING THE PRODUCTS IN THIS MANUAL ARE SUBJECT TO CHANGE WITHOUT NOTICE. ALL STATEMENTS, INFORMATION, AND RECOMMENDATIONS IN THIS MANUAL ARE BELIEVED TO BE ACCURATE BUT ARE PRESENTED WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED. USERS MUST TAKE FULL RESPONSIBILITY FOR THEIR APPLICATION OF ANY PRODUCTS. THE SOFTWARE LICENSE AND LIMITED WARRANTY FOR THE ACCOMPANYING PRODUCT ARE SET FORTH IN THE INFORMATION PACKET THAT SHIPPED WITH THE PRODUCT AND ARE INCORPORATED HEREIN BY THIS REFERENCE. IF YOU ARE UNABLE TO LOCATE THE SOFTWARE LICENSE OR LIMITED WARRANTY, CONTACT YOUR CISCO REPRESENTATIVE FOR A COPY. The Cisco implementation of TCP header compression is an adaptation of a program developed by the University of California, Berkeley (UCB) as part of UCB s public domain version of the UNIX operating system. All rights reserved. Copyright 1981, Regents of the University of California. NOTWITHSTANDING ANY OTHER WARRANTY HEREIN, ALL DOCUMENT FILES AND SOFTWARE OF THESE SUPPLIERS ARE PROVIDED AS IS WITH ALL FAULTS. CISCO AND THE ABOVE-NAMED SUPPLIERS DISCLAIM ALL WARRANTIES, EXPRESSED OR IMPLIED, INCLUDING, WITHOUT LIMITATION, THOSE OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT OR ARISING FROM A COURSE OF DEALING, USAGE, OR TRADE PRACTICE. IN NO EVENT SHALL CISCO OR ITS SUPPLIERS BE LIABLE FOR ANY INDIRECT, SPECIAL, CONSEQUENTIAL, OR INCIDENTAL DAMAGES, INCLUDING, WITHOUT LIMITATION, LOST PROFITS OR LOSS OR DAMAGE TO DATA ARISING OUT OF THE USE OR INABILITY TO USE THIS MANUAL, EVEN IF CISCO OR ITS SUPPLIERS HAVE BEEN ADVISED OF THE POSSIBILITY OF SUCH DAMAGES. CCIP, CCSP, the Cisco Arrow logo, the Cisco Powered Network mark, Cisco Unity, Follow Me Browsing, FormShare, and StackWise are trademarks of Cisco Systems, Inc.; Changing the Way We Work, Live, Play, and Learn, and iquick Study are service marks of Cisco Systems, Inc.; and Aironet, ASIST, BPX, Catalyst, CCDA, CCDP, CCIE, CCNA, CCNP, Cisco, the Cisco Certified Internetwork Expert logo, Cisco IOS, the Cisco IOS logo, Cisco Press, Cisco Systems, Cisco Systems Capital, the Cisco Systems logo, Empowering the Internet Generation, Enterprise/Solver, EtherChannel, EtherSwitch, Fast Step, GigaStack, Internet Quotient, IOS, IP/TV, iq Expertise, the iq logo, iq Net Readiness Scorecard, LightStream, Linksys, MGX, MICA, the Networkers logo, Networking Academy, Network Registrar, Packet, PIX, Post-Routing, Pre-Routing, RateMUX, Registrar, ScriptShare, SlideCast, SMARTnet, StrataView Plus, Stratm, SwitchProbe, TeleRouter, The Fastest Way to Increase Your Internet Quotient, TransPath, and VCO are registered trademarks of Cisco Systems, Inc. and/or its affiliates in the United States and certain other countries. All other trademarks mentioned in this document or Website are the property of their respective owners. The use of the word partner does not imply a partnership relationship between Cisco and any other company. (0402R) Copyright 2004 Cisco Systems, Inc. All rights reserved.

3 CONTENTS Preface xvii Audience xvii Purpose xvii Organization xvii Conventions xix Related Publications xxi Obtaining Documentation xxi Cisco.com xxi Documentation CD-ROM xxii Ordering Documentation xxii Documentation Feedback xxii Obtaining Technical Assistance xxii Cisco TAC Website xxiii Opening a TAC Case xxiii TAC Case Priority Definitions xxiii Obtaining Additional Publications and Information xxiv CHAPTER 1 Overview 1-1 Features 1-2 Management Options 1-4 Roaming Client Devices 1-4 Network Configuration Examples 1-4 Root Unit on a Wired LAN 1-4 Repeater Unit that Extends Wireless Range 1-6 Central Unit in an All-Wireless Network 1-7 CHAPTER 2 Configuring the Access Point for the First Time 2-1 Before You Start 2-2 Resetting the Access Point to Default Settings 2-2 Obtaining and Assigning an IP Address 2-3 Connecting to the 350 Series Access Point Locally 2-4 Connecting to the 1100 Series Access Point Locally 2-5 Connecting to the 1200 Series Access Point Locally 2-6 iii

4 Contents Assigning Basic Settings 2-6 Default Settings on the Express Setup Page 2-10 Configuring Basic Security Settings 2-11 Understanding Express Security Settings 2-12 Using VLANs 2-12 Express Security Types 2-12 Express Security Limitations 2-13 Using the Express Security Page 2-14 CLI Configuration Examples 2-14 Using the IP Setup Utility 2-19 Obtaining and Installing IPSU 2-20 Using IPSU to Find the Access Point s IP Address 2-20 Using IPSU to Set the Access Point s IP Address and SSID 2-21 Assigning an IP Address Using the CLI 2-23 Using a Telnet Session to Access the CLI 2-23 CHAPTER 3 Using the Web-Browser Interface 3-1 Using the Web-Browser Interface for the First Time 3-2 Using the Management Pages in the Web-Browser Interface 3-2 Using Action Buttons 3-4 Character Restrictions in Entry Fields 3-5 Using Online Help 3-5 CHAPTER 4 Using the Command-Line Interface 4-1 Cisco IOS Command Modes 4-2 Getting Help 4-3 Abbreviating Commands 4-3 Using no and default Forms of Commands 4-3 Understanding CLI Messages 4-4 Using Command History 4-4 Changing the Command History Buffer Size 4-4 Recalling Commands 4-5 Disabling the Command History Feature 4-5 Using Editing Features 4-5 Enabling and Disabling Editing Features 4-6 Editing Commands Through Keystrokes 4-6 Editing Command Lines that Wrap 4-7 Searching and Filtering Output of show and more Commands 4-8 iv

5 Contents Accessing the CLI 4-8 Opening the CLI with Telnet 4-8 Opening the CLI with Secure Shell 4-9 CHAPTER 5 Administering the Access Point 5-1 Preventing Unauthorized Access to Your Access Point 5-2 Protecting Access to Privileged EXEC Commands 5-2 Default Password and Privilege Level Configuration 5-2 Setting or Changing a Static Enable Password 5-3 Protecting Enable and Enable Secret Passwords with Encryption 5-4 Configuring Username and Password Pairs 5-5 Configuring Multiple Privilege Levels 5-6 Setting the Privilege Level for a Command 5-6 Logging Into and Exiting a Privilege Level 5-7 Controlling Access Point Access with RADIUS 5-7 Default RADIUS Configuration 5-8 Configuring RADIUS Login Authentication 5-8 Defining AAA Server Groups 5-9 Configuring RADIUS Authorization for User Privileged Access and Network Services 5-11 Displaying the RADIUS Configuration 5-12 Controlling Access Point Access with TACACS Default TACACS+ Configuration 5-13 Configuring TACACS+ Login Authentication 5-13 Configuring TACACS+ Authorization for Privileged EXEC Access and Network Services 5-14 Displaying the TACACS+ Configuration 5-15 Configuring Ethernet Speed and Duplex Settings 5-15 Configuring the Access Point for Wireless Network Management 5-16 Configuring the Access Point for Local Authentication and Authorization 5-16 Configuring the Access Point to Provide DHCP Service 5-18 Setting up the DHCP Server 5-18 Monitoring and Maintaining the DHCP Server Access Point 5-19 Show Commands 5-19 Clear Commands 5-20 Debug Command 5-20 Configuring the Access Point for Secure Shell 5-20 Understanding SSH 5-20 Configuring SSH 5-21 Configuring Client ARP Caching 5-21 v

6 Contents Understanding Client ARP Caching 5-21 Optional ARP Caching 5-22 Configuring ARP Caching 5-22 Managing the System Time and Date 5-22 Understanding the System Clock 5-23 Understanding Network Time Protocol 5-23 Configuring NTP 5-24 Default NTP Configuration 5-25 Configuring NTP Authentication 5-25 Configuring NTP Associations 5-27 Configuring NTP Broadcast Service 5-28 Configuring NTP Access Restrictions 5-29 Configuring the Source IP Address for NTP Packets 5-31 Displaying the NTP Configuration 5-32 Configuring Time and Date Manually 5-32 Setting the System Clock 5-33 Displaying the Time and Date Configuration 5-33 Configuring the Time Zone 5-34 Configuring Summer Time (Daylight Saving Time) 5-35 Configuring a System Name and Prompt 5-37 Default System Name and Prompt Configuration 5-37 Configuring a System Name 5-37 Understanding DNS 5-38 Default DNS Configuration 5-38 Setting Up DNS 5-39 Displaying the DNS Configuration 5-40 Creating a Banner 5-40 Default Banner Configuration 5-40 Configuring a Message-of-the-Day Login Banner 5-40 Configuring a Login Banner 5-42 CHAPTER 6 Configuring Radio Settings 6-1 Disabling and Enabling the Radio Interface 6-2 Configuring the Role in Radio Network 6-3 Configuring Radio Data Rates 6-4 Configuring Radio Transmit Power 6-6 Limiting the Power Level for Associated Client Devices 6-7 Configuring Radio Channel Settings 6-8 Enabling and Disabling World-Mode 6-10 vi

7 Contents Disabling and Enabling Short Radio Preambles 6-11 Configuring Transmit and Receive Antennas 6-11 Disabling and Enabling Aironet Extensions 6-12 Configuring the Ethernet Encapsulation Transformation Method 6-13 Enabling and Disabling Reliable Multicast to Workgroup Bridges 6-14 Enabling and Disabling Public Secure Packet Forwarding 6-15 Configuring Protected Ports 6-15 Configuring the Beacon Period and the DTIM 6-16 Configure RTS Threshold and Retries 6-16 Configuring the Maximum Data Retries 6-17 Configuring the Fragmentation Threshold 6-17 Enabling Short Slot Time for g Radios 6-18 Performing a Carrier Busy Test 6-18 CHAPTER 7 Configuring Multiple SSIDs 7-1 Understanding Multiple SSIDs 7-2 Configuring Multiple SSIDs 7-2 Default SSID Configuration 7-3 Creating an SSID 7-3 Using Spaces in SSIDs 7-4 Using a RADIUS Server to Restrict SSIDs 7-5 CHAPTER 8 Configuring an Access Point as a Local Authenticator 8-1 Understanding Local Authentication 8-2 Configuring a Local Authenticator 8-2 Guidelines for Local Authenticators 8-3 Configuration Overview 8-3 Configuring the Local Authenticator Access Point 8-3 Configuring Other Access Points to Use the Local Authenticator 8-6 Unblocking Locked Usernames 8-7 Viewing Local Authenticator Statistics 8-7 Using Debug Messages 8-7 CHAPTER 9 Configuring Cipher Suites and WEP 9-1 Understanding Cipher Suites and WEP 9-2 Configuring Cipher Suites and WEP 9-3 Creating WEP Keys 9-3 vii

8 Contents WEP Key Restrictions 9-4 Example WEP Key Setup 9-5 Enabling Cipher Suites and WEP 9-6 Matching Cipher Suites with WPA and CCKM 9-7 Enabling and Disabling Broadcast Key Rotation 9-7 CHAPTER 10 Configuring Authentication Types 10-1 Understanding Authentication Types 10-2 Open Authentication to the Access Point 10-2 Shared Key Authentication to the Access Point 10-3 EAP Authentication to the Network 10-3 MAC Address Authentication to the Network 10-5 Combining MAC-Based, EAP, and Open Authentication 10-6 Using CCKM for Authenticated Clients 10-6 Using WPA Key Management 10-7 Software and Firmware Requirements for WPA, CCKM, CKIP, and WPA-TKIP 10-8 Configuring Authentication Types Default Authentication Settings Assigning Authentication Types to an SSID Configuring WPA Migration Mode Configuring Additional WPA Settings Configuring MAC Authentication Caching Configuring Authentication Holdoffs, Timeouts, and Intervals Matching Access Point and Client Device Authentication Types CHAPTER 11 Configuring WDS, Fast Secure Roaming, and Radio Management 11-1 Understanding WDS 11-2 Role of the WDS Device 11-2 Role of Access Points Using the WDS Device 11-3 Understanding Fast Secure Roaming 11-3 Understanding Radio Management 11-4 Understanding Layer 3 Mobility 11-4 IP-Based Wireless Domain Services 11-5 Layer 3 Mobility Service Through Fast Secure Roaming Tunnels 11-5 Components Required for Layer 3 Mobility 11-5 Configuring WDS on the WLSM 11-6 Configuring WDS and Fast Secure Roaming 11-6 Guidelines for WDS 11-7 Requirements for WDS and Fast Secure Roaming 11-7 viii

9 Contents Configuration Overview 11-7 Configuring Access Points as Potential WDS Access Points 11-8 CLI Configuration Example Configuring Access Points to use the WDS Device CLI Configuration Example Enabling Layer 3 Mobility on an SSID CLI Configuration Example Configuring the Authentication Server to Support Fast Secure Roaming Viewing WDS Information Using Debug Messages Configuring Radio Management CLI Configuration Example CHAPTER 12 Configuring RADIUS and TACACS+ Servers 12-1 Configuring and Enabling RADIUS 12-2 Understanding RADIUS 12-2 RADIUS Operation 12-3 Configuring RADIUS 12-4 Default RADIUS Configuration 12-4 Identifying the RADIUS Server Host 12-4 Configuring RADIUS Login Authentication 12-7 Defining AAA Server Groups 12-9 Configuring RADIUS Authorization for User Privileged Access and Network Services Starting RADIUS Accounting Selecting the CSID Format Configuring Settings for All RADIUS Servers Configuring the Access Point to Use Vendor-Specific RADIUS Attributes Configuring the Access Point for Vendor-Proprietary RADIUS Server Communication Configuring WISPr RADIUS Attributes Displaying the RADIUS Configuration RADIUS Attributes Sent by the Access Point Configuring and Enabling TACACS Understanding TACACS TACACS+ Operation Configuring TACACS Default TACACS+ Configuration Identifying the TACACS+ Server Host and Setting the Authentication Key Configuring TACACS+ Login Authentication Configuring TACACS+ Authorization for Privileged EXEC Access and Network Services ix

10 Contents Starting TACACS+ Accounting Displaying the TACACS+ Configuration CHAPTER 13 Configuring VLANs 13-1 Understanding VLANs 13-2 Related Documents 13-3 Incorporating Wireless Devices into VLANs 13-4 Configuring VLANs 13-4 Configuring a VLAN 13-4 Using a RADIUS Server to Assign Users to VLANs 13-6 Viewing VLANs Configured on the Access Point 13-6 VLAN Configuration Example 13-7 CHAPTER 14 Configuring QoS 14-1 Understanding QoS for Wireless LANs 14-2 QoS for Wireless LANs Versus QoS on Wired LANs 14-2 Impact of QoS on a Wireless LAN 14-3 Precedence of QoS Settings 14-3 Configuring QoS 14-4 Configuration Guidelines 14-4 Configuring QoS Using the Web-Browser Interface 14-4 Adjusting Radio Access Categories 14-8 Disabling IGMP Snooping Helper Disabling AVVID Priority Mapping QoS Configuration Examples Giving Priority to Voice Traffic Giving Priority to Video Traffic CHAPTER 15 Configuring Proxy Mobile IP 15-1 Understanding Proxy Mobile IP 15-2 Overview 15-2 Components of a Proxy Mobile IP Network 15-2 How Proxy Mobile IP Works 15-3 Agent Discovery 15-3 Subnet Map Exchange 15-4 Registration 15-5 Tunneling 15-5 Proxy Mobile IP Security 15-6 x

11 Contents Configuring Proxy Mobile IP 15-6 Configuration Guidelines 15-7 Configuring Proxy Mobile IP on Your Wired LAN 15-7 Configuring Proxy Mobile IP on Your Access Point 15-8 CHAPTER 16 Configuring Filters 16-1 Understanding Filters 16-2 Configuring Filters Using the CLI 16-2 Configuring Filters Using the Web-Browser Interface 16-2 Configuring and Enabling MAC Address Filters 16-3 Creating a MAC Address Filter 16-4 Using MAC Address ACLs to Block or Allow Client Association to the Access Point 16-5 CLI Configuration Example 16-8 Configuring and Enabling IP Filters 16-8 Creating an IP Filter Configuring and Enabling Ethertype Filters Creating an Ethertype Filter CHAPTER 17 Configuring CDP 17-1 Understanding CDP 17-2 Configuring CDP 17-2 Default CDP Configuration 17-2 Configuring the CDP Characteristics 17-2 Disabling and Enabling CDP 17-3 Disabling and Enabling CDP on an Interface 17-4 Monitoring and Maintaining CDP 17-4 CHAPTER 18 Configuring SNMP 18-1 Understanding SNMP 18-2 SNMP Versions 18-2 SNMP Manager Functions 18-3 SNMP Agent Functions 18-3 SNMP Community Strings 18-3 Using SNMP to Access MIB Variables 18-4 Configuring SNMP 18-4 Default SNMP Configuration 18-5 Enabling the SNMP Agent 18-5 Configuring Community Strings 18-5 xi

12 Contents Configuring Trap Managers and Enabling Traps 18-7 Setting the Agent Contact and Location Information 18-9 Using the snmp-server view Command 18-9 SNMP Examples 18-9 Displaying SNMP Status CHAPTER 19 Configuring Repeater and Standby Access Points 19-1 Understanding Repeater Access Points 19-2 Configuring a Repeater Access Point 19-3 Default Configuration 19-4 Guidelines for Repeaters 19-4 Setting Up a Repeater 19-4 Verifying Repeater Operation 19-5 Setting Up a Repeater As a LEAP Client 19-6 Setting Up a Repeater As a WPA Client 19-7 Understanding Hot Standby 19-8 Configuring a Hot Standby Access Point 19-8 Verifying Standby Operation CHAPTER 20 Managing Firmware and Configurations 20-1 Working with the Flash File System 20-2 Displaying Available File Systems 20-2 Setting the Default File System 20-3 Displaying Information About Files on a File System 20-3 Changing Directories and Displaying the Working Directory 20-4 Creating and Removing Directories 20-4 Copying Files 20-5 Deleting Files 20-5 Creating, Displaying, and Extracting tar Files 20-6 Creating a tar File 20-6 Displaying the Contents of a tar File 20-6 Extracting a tar File 20-7 Displaying the Contents of a File 20-8 Working with Configuration Files 20-8 Guidelines for Creating and Using Configuration Files 20-9 Configuration File Types and Location 20-9 Creating a Configuration File by Using a Text Editor Copying Configuration Files by Using TFTP Preparing to Download or Upload a Configuration File by Using TFTP xii

13 Contents Downloading the Configuration File by Using TFTP Uploading the Configuration File by Using TFTP Copying Configuration Files by Using FTP Preparing to Download or Upload a Configuration File by Using FTP Downloading a Configuration File by Using FTP Uploading a Configuration File by Using FTP Copying Configuration Files by Using RCP Preparing to Download or Upload a Configuration File by Using RCP Downloading a Configuration File by Using RCP Uploading a Configuration File by Using RCP Clearing Configuration Information Deleting a Stored Configuration File Working with Software Images Image Location on the Access Point tar File Format of Images on a Server or Cisco.com Copying Image Files by Using TFTP Preparing to Download or Upload an Image File by Using TFTP Downloading an Image File by Using TFTP Uploading an Image File by Using TFTP Copying Image Files by Using FTP Preparing to Download or Upload an Image File by Using FTP Downloading an Image File by Using FTP Uploading an Image File by Using FTP Copying Image Files by Using RCP Preparing to Download or Upload an Image File by Using RCP Downloading an Image File by Using RCP Uploading an Image File by Using RCP Reloading the Image Using the Web Browser Interface Browser HTTP Interface Browser TFTP Interface CHAPTER 21 Configuring System Message Logging 21-1 Understanding System Message Logging 21-2 Configuring System Message Logging 21-2 System Log Message Format 21-2 Default System Message Logging Configuration 21-3 Disabling and Enabling Message Logging 21-4 Setting the Message Display Destination Device 21-5 Enabling and Disabling Timestamps on Log Messages 21-6 xiii

14 Contents Enabling and Disabling Sequence Numbers in Log Messages 21-6 Defining the Message Severity Level 21-7 Limiting Syslog Messages Sent to the History Table and to SNMP 21-8 Setting a Logging Rate Limit 21-9 Configuring UNIX Syslog Servers Logging Messages to a UNIX Syslog Daemon Configuring the UNIX System Logging Facility Displaying the Logging Configuration CHAPTER 22 Troubleshooting 22-1 Checking the Top Panel Indicators 22-2 Checking Basic Settings 22-5 SSID 22-5 WEP Keys 22-5 Security Settings 22-5 Resetting to the Default Configuration 22-5 Using the MODE Button 22-6 Using the Web Browser Interface 22-6 Using the CLI 22-7 Reloading the Access Point Image 22-8 Using the MODE button 22-8 Using the Web Browser Interface 22-9 Browser HTTP Interface 22-9 Browser TFTP Interface Using the CLI Obtaining the Access Point Image File Obtaining TFTP Server Software APPENDIX A Channels and Antenna Settings A-1 Channels A-2 IEEE b (2.4-GHz Band) A-2 IEEE g (2.4-GHz Band) A-3 IEEE a (5-GHz Band) A-4 Maximum Power Levels and Antenna Gains A-5 IEEE b (2.4-GHz Band) A-5 IEEE g (2.4-GHz Band) A-6 IEEE a (5-GHz Band) A-7 xiv

15 Contents APPENDIX B Protocol Filters B-1 APPENDIX C Supported MIBs C-1 MIB List C-1 Using FTP to Access the MIB Files C-2 APPENDIX D Error and Event Messages D-1 Software Auto Upgrade Messages D-1 Association Management Messages D-2 Proxy Mobile IP Subsystem Messages D-2 Unzip Messages D Subsystem Messages D-5 Inter-Access Point Protocol Messages D-9 Radio Diagnostic Messages D-10 G LOSSARY I NDEX xv

16 Contents xvi

17 Preface Audience This guide is for the networking professional who installs and manages Cisco Aironet Access Points. To use this guide, you should have experience working with the Cisco IOS software and be familiar with the concepts and terminology of wireless local area networks. Purpose This guide provides the information you need to install and configure your access point. This guide provides procedures for using the Cisco IOS software commands that have been created or changed for use with the access point. It does not provide detailed information about these commands. For detailed information about these commands, refer to the Cisco IOS Command Reference for Cisco Aironet Access Points and Bridges for this release. For information about the standard Cisco IOS software commands, refer to the Cisco IOS software documentation set available from the Cisco.com home page at Service and Support > Technical Documents. On the Cisco Product Documentation home page, select Release 12.2 from the Cisco IOS Software drop-down list. This guide also includes an overview of the access point web-based interface (APWI), which contains all the funtionality of the command-line interface (CLI). This guide does not provide field-level descriptions of the APWI windows nor does it provide the procedures for configuring the access point from from the APWI. For all APWI window descriptions and procedures, refer to the access point online help, which is available from the Help buttons on the APWI pages. Organization This guide is organized into these chapters: Chapter 1, Overview, lists the software and hardware features of the access point and describes the access point s role in your network. Chapter 2, Configuring the Access Point for the First Time, describes how to configure basic settings on a new access point. Chapter 3, Using the Web-Browser Interface, describes how to use the web-browser interface to configure the access point. Chapter 4, Using the Command-Line Interface, describes how to use the command-line interface (CLI) to configure the access point. xvii

18 Organization Preface Chapter 5, Administering the Access Point, describes how to perform one-time operations to administer your access point, such as preventing unauthorized access to the access point, setting the system date and time, and setting the system name and prompt. Chapter 6, Configuring Radio Settings, describes how to configure settings for the access point radio such as the role in the radio network, data rates, transmit power, channel settings, and others. Chapter 7, Configuring Multiple SSIDs, describes how to configure and manage multiple service set identifiers (SSIDs) on your access point. You can configure up to 16 SSIDs on your access point and assign different configuration settings to each SSID. Chapter 8, Configuring an Access Point as a Local Authenticator, describes how to configure the access point to act as a local RADIUS server for your wireless LAN. If the WAN connection to your main RADIUS server fails, the access point acts as a backup server to authenticate wireless devices. Chapter 9, Configuring Cipher Suites and WEP, describes how to configure the cipher suites required to use authenticated key management, Wired Equivalent Privacy (WEP), and WEP features including MIC, CMIC, TKIP, CKIP, and broadcast key rotation. Chapter 10, Configuring Authentication Types, describes how to configure authentication types on the access point. Client devices use these authentication methods to join your network. Chapter 11, Configuring WDS, Fast Secure Roaming, and Radio Management, describes how to configure the access point to allow fast reassociation of roaming client devices. Using Cisco Centralized Key Management (CCKM) and an access point configured as a subnet context manager, client devices can roam from one access point to another without causing a delay in timing-sensitive applications, such as Voice over IP. Chapter 12, Configuring RADIUS and TACACS+ Servers, describes how to enable and configure the Remote Authentication Dial-In User Service (RADIUS) and Terminal Access Controller Access Control System Plus (TACACS+), which provide detailed accounting information and flexible administrative control over authentication and authorization processes. Chapter 13, Configuring VLANs, describes how to configure your access point to interoperate with the VLANs set up on your wired LAN. Chapter 14, Configuring QoS, describes how to configure quality of service (QoS) on your access point. With this feature, you can provide preferential treatment to certain traffic at the expense of others. Chapter 15, Configuring Proxy Mobile IP, describes how to configure your access point s proxy mobile IP feature. When you enable proxy mobile IP on your access point and on your wired network, the access point helps client devices from other networks remain connected to their home networks. Chapter 16, Configuring Filters, describes how to configure and manage MAC address, IP, and Ethertype filters on the access point using the web-browser interface. Chapter 17, Configuring CDP, describes how to configure Cisco Discovery Protocol (CDP) on your access point. CDP is a device-discovery protocol that runs on all Cisco network equipment. Chapter 18, Configuring SNMP, describes how to configure the Simple Network Management Protocol (SNMP) on your access point. Chapter 19, Configuring Repeater and Standby Access Points, descibes how to configure your access point as a hot standby unit or as a repeater unit. Chapter 20, Managing Firmware and Configurations, describes how to manipulate the Flash file system, how to copy configuration files, and how to archive (upload and download) software images. Chapter 21, Configuring System Message Logging, describes how to configure system message logging on your access point. Chapter 22, Troubleshooting, provides troubleshooting procedures for basic problems with the access point. xviii

19 Preface Conventions Appendix A, Channels and Antenna Settings, lists the access point radio channels and the maximum power levels supported by the world s regulatory domains. Appendix B, Protocol Filters, lists some of the protocols that you can filter on the access point. Appendix C, Supported MIBs, lists the Simple Network Management Protocol (SNMP) Management Information Bases (MIBs) that the access point supports for this software release. Appendix D, Error and Event Messages, lists the CLI error and event messages and provides an explanation and recommended action for each message. Conventions This publication uses these conventions to convey instructions and information: Command descriptions use these conventions: Commands and keywords are in boldface text. Arguments for which you supply values are in italic. Square brackets ([ ]) mean optional elements. Braces ({ }) group required choices, and vertical bars ( ) separate the alternative elements. Braces and vertical bars within square brackets ([{ }]) mean a required choice within an optional element. Interactive examples use these conventions: Terminal sessions and system displays are in screen font. Information you enter is in boldface screen font. Nonprinting characters, such as passwords or tabs, are in angle brackets (< >). Notes, cautions, and timesavers use these conventions and symbols: Tip Means the following will help you solve a problem. The tips information might not be troubleshooting or even an action, but could be useful information. Note Means reader take note. Notes contain helpful suggestions or references to materials not contained in this manual. Caution Means reader be careful. In this situation, you might do something that could result equipment damage or loss of data. xix

20 Conventions Preface Warning Waarschuwing Varoitus Attention Warnung Avvertenza Advarsel Aviso This warning symbol means danger. You are in a situation that could cause bodily injury. Before you work on any equipment, be aware of the hazards involved with electrical circuitry and be familiar with standard practices for preventing accidents. (To see translations of the warnings that appear in this publication, refer to the appendix Translated Safety Warnings. ) Dit waarschuwingssymbool betekent gevaar. U verkeert in een situatie die lichamelijk letsel kan veroorzaken. Voordat u aan enige apparatuur gaat werken, dient u zich bewust te zijn van de bij elektrische schakelingen betrokken risico s en dient u op de hoogte te zijn van standaard maatregelen om ongelukken te voorkomen. (Voor vertalingen van de waarschuwingen die in deze publicatie verschijnen, kunt u het aanhangsel Translated Safety Warnings (Vertalingen van veiligheidsvoorschriften) raadplegen.) Tämä varoitusmerkki merkitsee vaaraa. Olet tilanteessa, joka voi johtaa ruumiinvammaan. Ennen kuin työskentelet minkään laitteiston parissa, ota selvää sähkökytkentöihin liittyvistä vaaroista ja tavanomaisista onnettomuuksien ehkäisykeinoista. (Tässä julkaisussa esiintyvien varoitusten käännökset löydät liitteestä "Translated Safety Warnings" (käännetyt turvallisuutta koskevat varoitukset).) Ce symbole d avertissement indique un danger. Vous vous trouvez dans une situation pouvant entraîner des blessures. Avant d accéder à cet équipement, soyez conscient des dangers posés par les circuits électriques et familiarisez-vous avec les procédures courantes de prévention des accidents. Pour obtenir les traductions des mises en garde figurant dans cette publication, veuillez consulter l annexe intitulée «Translated Safety Warnings» (Traduction des avis de sécurité). Dieses Warnsymbol bedeutet Gefahr. Sie befinden sich in einer Situation, die zu einer Körperverletzung führen könnte. Bevor Sie mit der Arbeit an irgendeinem Gerät beginnen, seien Sie sich der mit elektrischen Stromkreisen verbundenen Gefahren und der Standardpraktiken zur Vermeidung von Unfällen bewußt. (Übersetzungen der in dieser Veröffentlichung enthaltenen Warnhinweise finden Sie im Anhang mit dem Titel Translated Safety Warnings (Übersetzung der Warnhinweise).) Questo simbolo di avvertenza indica un pericolo. Si è in una situazione che può causare infortuni. Prima di lavorare su qualsiasi apparecchiatura, occorre conoscere i pericoli relativi ai circuiti elettrici ed essere al corrente delle pratiche standard per la prevenzione di incidenti. La traduzione delle avvertenze riportate in questa pubblicazione si trova nell appendice, Translated Safety Warnings (Traduzione delle avvertenze di sicurezza). Dette varselsymbolet betyr fare. Du befinner deg i en situasjon som kan føre til personskade. Før du utfører arbeid på utstyr, må du være oppmerksom på de faremomentene som elektriske kretser innebærer, samt gjøre deg kjent med vanlig praksis når det gjelder å unngå ulykker. (Hvis du vil se oversettelser av de advarslene som finnes i denne publikasjonen, kan du se i vedlegget "Translated Safety Warnings" [Oversatte sikkerhetsadvarsler].) Este símbolo de aviso indica perigo. Encontra-se numa situação que lhe poderá causar danos fisicos. Antes de começar a trabalhar com qualquer equipamento, familiarize-se com os perigos relacionados com circuitos eléctricos, e com quaisquer práticas comuns que possam prevenir possíveis acidentes. (Para ver as traduções dos avisos que constam desta publicação, consulte o apêndice Translated Safety Warnings - Traduções dos Avisos de Segurança ). xx

21 Preface Related Publications Advertencia! Varning! Este símbolo de aviso significa peligro. Existe riesgo para su integridad física. Antes de manipular cualquier equipo, considerar los riesgos que entraña la corriente eléctrica y familiarizarse con los procedimientos estándar de prevención de accidentes. (Para ver traducciones de las advertencias que aparecen en esta publicación, consultar el apéndice titulado Translated Safety Warnings. ) Denna varningssymbol signalerar fara. Du befinner dig i en situation som kan leda till personskada. Innan du utför arbete på någon utrustning måste du vara medveten om farorna med elkretsar och känna till vanligt förfarande för att förebygga skador. (Se förklaringar av de varningar som förekommer i denna publikation i appendix "Translated Safety Warnings" [Översatta säkerhetsvarningar].) Related Publications These documents provide complete information about the access point: Quick Start Guide: Cisco Aironet 350 Series Access Points Quick Start Guide: Cisco Aironet 1100 Series Access Points Quick Start Guide: Cisco Aironet 1200 Series Access Points Cisco IOS Command Reference for Cisco Aironet Access Points and Bridges Installation Instructions for Cisco Aironet Power Injectors Cisco Aironet g Radio Upgrade Instructions Release Notes for 350, 1100, and 1200 Series Access Points for Cisco IOS Release 12.2(13)JA Click this link to browse to the Cisco Aironet documentation home page: Obtaining Documentation Cisco provides several ways to obtain documentation, technical assistance, and other technical resources. These sections explain how to obtain technical information from Cisco Systems. Cisco.com You can access the most current Cisco documentation on the World Wide Web at this URL: You can access the Cisco website at this URL: International Cisco websites can be accessed from this URL: xxi

22 Documentation Feedback Preface Documentation CD-ROM Cisco documentation and additional literature are available in a Cisco Documentation CD-ROM package, which may have shipped with your product. The Documentation CD-ROM is updated regularly and may be more current than printed documentation. The CD-ROM package is available as a single unit or through an annual or quarterly subscription. Registered Cisco.com users can order a single Documentation CD-ROM (product number DOC-CONDOCCD=) through the Cisco Ordering tool: All users can order annual or quarterly subscriptions through the online Subscription Store: Click Subscriptions & Promotional Materials in the left navigation bar. Ordering Documentation You can find instructions for ordering documentation at this URL: You can order Cisco documentation in these ways: Registered Cisco.com users (Cisco direct customers) can order Cisco product documentation from the Networking Products MarketPlace: Nonregistered Cisco.com users can order documentation through a local account representative by calling Cisco Systems Corporate Headquarters (California, USA) at or, elsewhere in North America, by calling NETS (6387). Documentation Feedback You can submit comments about technical documentation to bug-doc@cisco.com. You can submit comments by using the response card (if present) behind the front cover of your document or by writing to the following address: Cisco Systems Attn: Customer Document Ordering 170 West Tasman Drive San Jose, CA We appreciate your comments. Obtaining Technical Assistance For all customers, partners, resellers, and distributors who hold valid Cisco service contracts, the Cisco Technical Assistance Center (TAC) provides 24-hour-a-day, award-winning technical support services, online and over the phone. Cisco.com features the Cisco TAC website as an online starting point for technical assistance. If you do not hold a valid Cisco service contract, please contact your reseller. xxii

23 Preface Obtaining Technical Assistance Cisco TAC Website The Cisco TAC website ( provides online documents and tools for troubleshooting and resolving technical issues with Cisco products and technologies. The Cisco TAC website is available 24 hours a day, 365 days a year. Accessing all the tools on the Cisco TAC website requires a Cisco.com user ID and password. If you have a valid service contract but do not have a login ID or password, register at this URL: Opening a TAC Case Using the online TAC Case Open Tool ( is the fastest way to open P3 and P4 cases. (P3 and P4 cases are those in which your network is minimally impaired or for which you require product information.) After you describe your situation, the TAC Case Open Tool automatically recommends resources for an immediate solution. If your issue is not resolved using the recommended resources, your case will be assigned to a Cisco TAC engineer. For P1 or P2 cases (P1 and P2 cases are those in which your production network is down or severely degraded) or if you do not have Internet access, contact Cisco TAC by telephone. Cisco TAC engineers are assigned immediately to P1 and P2 cases to help keep your business operations running smoothly. To open a case by telephone, use one of the following numbers: Asia-Pacific: (Australia: ) EMEA: USA: For a complete listing of Cisco TAC contacts, go to this URL: TAC Case Priority Definitions To ensure that all cases are reported in a standard format, Cisco has established case priority definitions. Priority 1 (P1) Your network is down or there is a critical impact to your business operations. You and Cisco will commit all necessary resources around the clock to resolve the situation. Priority 2 (P2) Operation of an existing network is severely degraded, or significant aspects of your business operation are negatively affected by inadequate performance of Cisco products. You and Cisco will commit full-time resources during normal business hours to resolve the situation. Priority 3 (P3) Operational performance of your network is impaired, but most business operations remain functional. You and Cisco will commit resources during normal business hours to restore service to satisfactory levels. Priority 4 (P4) You require information or assistance with Cisco product capabilities, installation, or configuration. There is little or no effect on your business operations. xxiii

24 Obtaining Additional Publications and Information Preface Obtaining Additional Publications and Information Information about Cisco products, technologies, and network solutions is available from various online and printed sources. The Cisco Product Catalog describes the networking products offered by Cisco Systems, as well as ordering and customer support services. Access the Cisco Product Catalog at this URL: Cisco Press publishes a wide range of general networking, training and certification titles. Both new and experienced user will benefit from these publications. For current Cisco Press titles and other information, go to Cisco Press online at this URL: Packet magazine is the Cisco quarterly publication that provides the latest networking trends, technology breakthroughs, and Cisco products and solutions to help industry professionals get the most from their networking investment. Included are networking deployment and troubleshooting tips, configuration examples, customer case studies, tutorials and training, certification information, and links to numerous in-depth online resources. You can access Packet magazine at this URL: iq Magazine is the Cisco bimonthly publication that delivers the latest information about Internet business strategies for executives. You can access iq Magazine at this URL: Internet Protocol Journal is a quarterly journal published by Cisco Systems for engineering professionals involved in designing, developing, and operating public and private internets and intranets. You can access the Internet Protocol Journal at this URL: Training Cisco offers world-class networking training. Current offerings in network training are listed at this URL: xxiv

25 CHAPTER 1 Overview Cisco Aironet Access Points (hereafter called access points) provide a secure, affordable, and easy-to-use wireless LAN solution that combines mobility and flexibility with the enterprise-class features required by networking professionals. With a management system based on Cisco IOS software, Cisco Aironet 350, 1100, and 1200 series access points are Wi-Fi certified, b-compliant, g-compliant, and a-compliant wireless LAN transceivers. The 350 series access point, which can be upgraded to run Cisco IOS software, uses a single, b, 2.4-GHz mini-pci radio. The 1100 series access point uses a single, b, 2.4-GHz mini-pci radio that can be upgraded to an g, 2.4-GHz radio. The 1200 series access point can contain two radios: a 2.4-GHz radio in an internal mini-pci slot and a 5-GHz radio module in an external, modified cardbus slot. The 1200 series access point supports one radio of each type, but it does not support two 2.4-GHz or two 5-GHz radios. You can configure the radios separately, using different settings on each radio. Access points serves as the connection point between wireless and wired networks or as the center point of a stand-alone wireless network. In large installations, wireless users within radio range of an access point can roam throughout a facility while maintaining seamless, uninterrupted access to the network. You can configure and monitor the access point using the command-line interface (CLI), the browser-based management system, or Simple Network Management Protocol (SNMP). This chapter provides information on the following topics: Features, page 1-2 Management Options, page 1-4 Roaming Client Devices, page 1-4 Network Configuration Examples, page

26 Features Chapter 1 Overview Features Access points running Cisco IOS software offer these software features: World mode Use this feature to communicate the access point s regulatory setting information, including maximum transmit power and available channels, to world mode-enabled clients. Clients using world mode can be used in countries with different regulatory settings and automatically conform to local regulations. World mode is supported only on the 2.4-GHz radio. Repeater mode Configure the access point as a wireless repeater to extend the coverage area of your wireless network. Standby mode Configure the access point as a standby unit that monitors another access point and assumes its role in the network if the monitored access point fails. Multiple SSIDs Create up to 16 SSIDs on your access point and assign any combination of these settings to each SSID: Broadcast SSID mode for guests on your network Client authentication methods Maximum number of client associations VLAN identifier Proxy Mobile IP RADIUS accounting list identifier A separate SSID for infrastructure devices such as repeaters and workgroup bridges VLANs Assign VLANs to the SSIDs on your access point (one VLAN per SSID) to differentiate policies and services among users. QoS Use this feature to support quality of service for prioritizing traffic from the Ethernet to the access point. The access point also supports the voice-prioritization schemes used by b wireless phones such as Spectralink's Netlink and Symbol s Netvision. Proxy Mobile IP Use this feature to configure the access point to provide proxy Mobile IP service for clients that do not have mobile IP software installed. RADIUS Accounting Enable accounting on the access point to send accounting data about wireless client devices to a RADIUS server on your network. TACACS+ adminstrator authentication Enable TACACS+ for server-based, detailed accounting information and flexible administrative control over authentication and authorization processes. It provides secure, centralized validation of administrators attempting to gain access to your access point. Enhanced security Enable three advanced security features to protect against sophisticated attacks on your wireless network's WEP keys: Message Integrity Check (MIC), WEP key hashing, and broadcast WEP key rotation. Enhanced authentication services Set up repeater access points to authenticate to your network like other wireless client devices. After you provide a network username and password for the repeater, it authenticates to your network using LEAP, Cisco's wireless authentication method, and receives and uses dynamic WEP keys. 1-2

27 Chapter 1 Overview Features Wi-Fi Protected Access (WPA) Wi-Fi Protected Access is a standards-based, interoperable security enhancement that strongly increases the level of data protection and access control for existing and future wireless LAN systems. It is derived from and will be forward-compatible with the upcoming IEEE i standard. WPA leverages TKIP (Temporal Key Integrity Protocol) for data protection and 802.1X for authenticated key management. Fast secured roaming using Cisco Centralized Key Management (CCKM) Using CCKM, authenticated client devices can roam securely from one access point to another without any perceptible delay during reassociation. An access point on your network provides wireless domain services (WDS) and creates a cache of security credentials for CCKM-enabled client devices on the subnet. The WDS access point s cache of credentials dramatically reduces the time required for reassociation when a CCKM-enabled client device roams to a new access point. Access point as backup or stand-alone authentication server You can configure an access point to act as a local authentication server to provide authentication service for small wireless LANs without a RADIUS server or to provide backup authentication service in case of a WAN link or a server failure. The access point can authenticate up to 50 LEAP-enabled wireless client devices and allow them to join your network. Access points running Cisco IOS Release 12.2(15)JA also can provide backup MAC-address authentication service for up to 50 addresses. Client ARP caching To reduce traffic on the wireless LAN, you can configure access points running Cisco IOS Release 12.2(13)JA or later to reply to ARP queries on behalf of associated client devices. In previous releases, the access point forwards ARP queries to all associated client devices, and the specified client responds with its MAC address. When the access point maintains an ARP cache, however, it responds to ARP queries on behalf of the client device and does not forward the queries through its radio port. CCKM voice clients and WPA clients on the same VLAN Access points running Cisco IOS Release 12.2(13)JA or later allow both b CCKM voice clients and b WPA clients on the same VLAN. WISPr RADIUS attributes The Wi-Fi Alliance s WISPr Best Current Practices for Wireless Internet Service Provider (WISP) Roaming document lists RADIUS attributes that access points must send with RADIUS accounting and authentication requests. You can configure access points running Cisco IOS Release 12.2(13)JA or later to include these attributes in all RADIUS accounting and authentication requests. Support for g radios Cisco IOS Releases 12.2(13)JA or later support the g, 2.4-GHz mini-pci radio. You can upgrade the b, 2.4-GHz radio in 1100 and 1200 series access points with an g, 2.4-GHz radio. Radio management features on a, b, and g radios Access points running Cisco IOS Release 12.2(15)JA can participate in radio management using a, b, and g radios. Access points configured for WDS interact with the WDS device on your wireless LAN. The WDS device forwards radio data to and from the WLSE device or wireless network manager on your network. Radio management includes these features, which are configured on your WLSE device: Rogue access point detection, including the rogue device s IP and MAC addresses, SSID, and, if it is connected to a Cisco device, the switch port to which the rogue is connected Self-healing wireless LAN; if an access point fails, nearby access points increase their transmit power to cover the gap in your wireless LAN Client tracking to identify the access point to which each client device is associated Scanning-only mode Access points running Cisco IOS Release 12.2(15)JA can act as scanners to detect rogue access points and monitor radio traffic on your wireless LAN. Access points configured as scanners participate in radio management but do not accept client associations. 1-3

28 Management Options Chapter 1 Overview Management Options You can use the access point management system through the following interfaces: The Cisco IOS command-line interface (CLI), which you use through a Telnet session. Most of the examples in this manual are taken from the CLI. Chapter 4, Using the Command-Line Interface, provides a detailed description of the CLI. A web-browser interface, which you use through a web browser. Chapter 3, Using the Web-Browser Interface, provides a detailed description of the web-browser interface. Simple Network Management Protocol (SNMP). Chapter 18, Configuring SNMP, explains how to configure your access point for SNMP management. Roaming Client Devices If you have more than one access point in your wireless LAN, wireless client devices can roam seamlessly from one access point to another. The roaming functionality is based on signal quality, not proximity. When a client s signal quality drops, it roams to another access point. Wireless LAN users are sometimes concerned when a client device stays associated to a distant access point instead of roaming to a closer access point. However, if a client s signal to a distant access point remains strong and the signal quality is high, the client will not roam to a closer access point. Checking constantly for closer access points would be inefficient, and the extra radio traffic would slow throughput on the wireless LAN. Using CCKM and a device providing Wireless Domain Services (WDS), client devices can roam from one access point to another so quickly that there is no perceptible delay in voice or other time-sensitive applications. Network Configuration Examples This section describes the access point s role in common wireless network configurations. The access point s default configuration is as a root unit connected to a wired LAN or as the central unit in an all-wireless network. The repeater role requires a specific configuration. Root Unit on a Wired LAN An access point connected directly to a wired LAN provides a connection point for wireless users. If more than one access point is connected to the LAN, users can roam from one area of a facility to another without losing their connection to the network. As users move out of range of one access point, they automatically connect to the network (associate) through another access point. The roaming process is seamless and transparent to the user. Figure 1-1 shows access points acting as root units on a wired LAN. 1-4