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

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Understanding SNMP Chapter 18 Configuring SNMP • Set a MIB variable—The SNMP agent begins this function in response to a message from the NMS. The SNMP agent changes the value of the MIB variable to the value requested by the NMS. The SNMP agent also sends unsolicited trap messages to notify an NMS that a significant event has occurred on the agent. Examples of trap conditions include, but are not limited to, when a port or module goes up or down, when spanning-tree topology changes occur, and when authentication failures occur. SNMP Community Strings SNMP community strings authenticate access to MIB objects and function as embedded passwords. In order for the NMS to access the access point, the community string definitions on the NMS must match at least one of the three community string definitions on the access point. A community string can have one of these attributes: • Read-only—Gives read access to authorized management stations to all objects in the MIB except the community strings, but does not allow write access • Read-write—Gives read and write access to authorized management stations to all objects in the MIB, but does not allow access to the community strings Using SNMP to Access MIB Variables An example of an NMS is the CiscoWorks network management software. CiscoWorks 2000 software uses the access point MIB variables to set device variables and to poll devices on the network for specific information. The results of a poll can be displayed as a graph and analyzed to troubleshoot internetworking problems, increase network performance, verify the configuration of devices, monitor traffic loads, and more. As shown in Figure 18-1, the SNMP agent gathers data from the MIB. The agent can send traps (notification of certain events) to the SNMP manager, which receives and processes the traps. Traps are messages alerting the SNMP manager to a condition on the network such as improper user authentication, restarts, link status (up or down), MAC address tracking, and so forth. The SNMP agent also responds to MIB-related queries sent by the SNMP manager in get-request, get-next-request, and set-request format. Figure 18-1 SNMP Network NMS get-request, get-next-request, get-bulk, set-request Network device SNMP manager get-response, traps MIB SNMP agent 81949 For information on supported MIBs and how to access them, see Appendix B, “Supported MIBs.” 18-4 Cisco IOS Software Configuration Guide for Cisco Aironet Access Points OL-8191-01
Chapter 18 Configuring SNMP Configuring SNMP Configuring SNMP This section describes how to configure SNMP on your access point. It contains this configuration information: • Default SNMP Configuration, page 18-5 • Enabling the SNMP Agent, page 18-5 • Configuring Community Strings, page 18-6 • Specifying SNMP-Server Group Names, page 18-7 • Configuring SNMP-Server Hosts, page 18-8 • Configuring SNMP-Server Users, page 18-8 • Configuring Trap Managers and Enabling Traps, page 18-8 • Setting the Agent Contact and Location Information, page 18-10 • Using the snmp-server view Command, page 18-10 • SNMP Examples, page 18-10 Default SNMP Configuration Table 18-3 shows the default SNMP configuration. Table 18-3 Default SNMP Configuration Feature SNMP agent SNMP community strings SNMP trap receiver SNMP traps Default Setting Disabled No strings are configured by default. However, when you enable SNMP using the web-browser interface, the access point automatically creates the public community with read-only access to the IEEE802dot11 MIB. None configured None enabled Enabling the SNMP Agent No specific CLI command exists to enable SNMP. The first snmp-server global configuration command that you enter enables the supported versions of SNMP. You can also enable SNMP on the SNMP Properties page on the web-browser interface. When you enable SNMP on the web-browser interface, the access point automatically creates a community string called public with read-only access to the IEEE802dot11 MIB. OL-8191-01 Cisco IOS Software Configuration Guide for Cisco Aironet Access Points 18-5
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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 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 9 Configuring an Access Poi
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Chapter 9 Configuring an Access Poi
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CHAPTER 10 Configuring Cipher Suite
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Chapter 10 Configuring Cipher Suite
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CHAPTER 11 Configuring Authenticati
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Chapter 11 Configuring Authenticati
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CHAPTER 12 Configuring WDS, Fast Se
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Chapter 12 Configuring WDS, Fast Se
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CHAPTER 13 Configuring RADIUS and T
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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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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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