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

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Configuring QoS Chapter 15 Configuring QoS IGMP Snooping AVVID Priority Mapping WiFi Multimedia (WMM) When Internet Group Membership Protocol (IGMP) snooping is enabled on a switch and a client roams from one access point to another, the clients’ multicast session is dropped. When the access points’ IGMP snooping helper is enabled, the access point sends a general query to the wireless LAN, prompting the client to send in an IGMP membership report. When the network infrastructure receives the host’s IGMP membership report, it ensures delivery of that host’s multicast data stream. The IGMP snooping helper is enabled by default. To disable it, browse to the QoS Policies - Advanced page, select Disable, and click Apply. AVVID priority mapping maps Ethernet packets tagged as class of service 5 to class of service 6. This feature enables the access point to apply the correct priority to voice packets for compatibility with Cisco AVVID networks. AVVID priority mapping is enabled by default. To disable it, browse to the QoS Policies - Advanced page, select No for Map Ethernet Packets with CoS 5 to CoS 6, and click Apply. Using the Admission Control check boxes, you can enable WMM on the access point’s radio interface. When you enable admission control, clients associated to the access point must complete the WMM admission control procedure before they can use that access category. Adjusting Radio Access Categories The access point uses the radio access categories to calculate backoff times for each packet. As a rule, high-priority packets have short backoff times. The default values in the Min and Max Contention Window fields and in the Slot Time fields are based on settings recommended in IEEE Draft Standard 802.11e. For detailed information on these values, consult that standard. Cisco strongly recommends that you use the default settings on the Radio Access Categories page. Changing these values can lead to unexpected blockages of traffic on your wireless LAN, and the blockages might be difficult to diagnose. If you change these values and find that you need to reset them to defaults, use the default settings listed in Table 15-1. The values listed in Table 15-1 are to the power of 2. The access point computes Contention Window values with this equation: CW = 2 ** X minus 1 where X is the value from Table 15-1. 15-10 Cisco IOS Software Configuration Guide for Cisco Aironet Access Points OL-8191-01
Chapter 15 Configuring QoS Configuring QoS Table 15-1 Default QoS Radio Access Categories Min Contention Window Max Contention Window Fixed Slot Time Transmit Opportunity Admission Control Class of Service Local Cell Local Cell Local Cell Local Cell Local Cell Background 4 10 6 0 Best Effort 4 10 2 0 Video
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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 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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Page 271 and 272: CHAPTER 13 Configuring RADIUS and T
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Page 329 and 330: CHAPTER 16 Configuring Filters This
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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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Chapter 19 Configuring Repeater and
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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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