现代无线网络QoS的内部工作原理.pdf

1、#CiscoLive#CiscoLiveRobert Barton,Distinguished Architect,Americas SalesBRKEWN-2031The Inner Working of QoS for Modern Wireless Networks 2023 Cisco and/or its affiliates.All rights reserved.Cisco Public#CiscoLiveEnter your personal notes hereCisco Webex App 3Questions?Use Cisco Webex App to chat wit

2、h the speaker after the sessionFind this session in the Cisco Live Mobile AppClick“Join the Discussion”Install the Webex App or go directly to the Webex spaceEnter messages/questions in the Webex spaceHowWebex spaces will be moderated by the speaker until June 9,2023.12343https:/ 2023 Cisco and/or i

3、ts affiliates.All rights reserved.Cisco PublicBRKEWN-2031Agenda 2023 Cisco and/or its affiliates.All rights reserved.Cisco Public802.11 QoS Building BlocksLegacy QoS:The Enhanced Distributed Channel Access(EDCA)ModelHow QoS Works in Wi-Fi6/6EAireOS Wireless LAN QoS DeploymentsIOS-XE/Catalyst 9800 Qo

4、S DeploymentsNext-Gen QoS:IEEE 802.11be and beyondBRKEWN-20314802.11 QoS Building Blocks 2023 Cisco and/or its affiliates.All rights reserved.Cisco Public#CiscoLiveComparing Wired and Wireless QoSWired environments are Full Duplex,Wireless is Half Duplex(for now)Half duplex environments are very sus

5、ceptible to collisionsThus,wired QoS is mostly concerned with managing packet loss due to congestion problems(solved with queuing,etc.)6Wireless QoS is focused on a much bigger problem:1.WLAN QoS is mostly concerned with reducing the probabilityprobability of a collision for high-priority traffic,ba

6、sed on its QoS classification2.Managing congestion is a secondary concernBRKEWN-2031 2023 Cisco and/or its affiliates.All rights reserved.Cisco Public#CiscoLiveCarrier Sense Multiple Access/Collision AvoidanceWired Hubs use CSMA/CD(collision detection)A station must listen to the medium to see if it