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Module 9

Module 9. QOS Turning Wireless Service into Quality Wireless Service. Objectives. Describe key WLAN and radio QoS polices Describe QoS radio hardware queues Identify the Default QoS Mapping tables Discuss the typed of QoS Mappings. WLAN QoS Policies. WLAN QoS Policies. WLAN.

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Module 9

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  1. Module 9 QOS Turning Wireless Service into Quality Wireless Service

  2. Objectives • Describe key WLAN and radio QoS polices • Describe QoS radio hardware queues • Identify the Default QoS Mapping tables • Discuss the typed of QoS Mappings

  3. WLAN QoS Policies

  4. WLAN QoS Policies WLAN • Each WLAN is assigned to a WLAN QoS policy that defines: • The Wireless Client classification: • WMM • Static QoS (Voice, Video, Normal, Low) • Enables / Disables SVP support • WLAN upstream / downstream rate limits • Wireless Client upstream / downstream rate limits: • A default QoS policy is created by default that supports WMM • One default or user defined WLAN QoS policy must be assigned per WLAN WLAN WLAN SVP WLAN QoS Policy Wireless Client Classification Wireless Client Rate Limits WLAN Rate Limits

  5. Radio Hardware Queues

  6. Radio Hardware Queues • Each AP radio supports 6 hardware queues, each assigned to a specific traffic class: • One hardware queue is dedicated for 802.11 management frames such as beacons etc.. • One strict hardware queue is provided for SVP (if enabled) • Four hardware queues are provided for each WMM AC • Traffic is placed into one of the hardware queues based on the DSCP /802.1p QoS markings of ingress traffic • Ethernet interfaces on Controllers and APs can be configured to trust 802.1p and DSCP marked packets Management SVP (Strict) Voice Queue Scheduler Radio Video Background Best Effort

  7. Radio QoS Policies

  8. Radio QoS Policies Radio • Each Radio is assigned a Radio QoS Policy that defines the radio queue parameters for each WMM Access Category and Admission Control • Per WMM AC Queue Parameters: • Arbitration Inter Frame Spacing Number • Maximum Contention Window • Minimum Contention Window • Transmit Opportunity • Per WMM AC Admission Control Parameters: • Max Airtime Percentage • Maximum Clients • Maximum Roamed Clients • Reserved for Roam Percentage • In most cases the default values will suffice and the default Radio QoS policy can be used • One default or user defined Radio QoS policy must be assigned per radio Radio Radio Radio Policy WMM TSPEC Admission Control

  9. Default QoS Mapping Tables

  10. Default QoS Mapping Tables 802.1p Priority  WMM Mapping Table WMM  802.1p Priority Mapping Table DSCP  802.1p Priority Mapping Table WMM  DSCP Mapping Table

  11. Wired QoS Mappings

  12. Wired QoS Mappings (Wireless  Wired) • Access Points will automatically mark Wired QoS headers for MiNTTunnelled traffic and Local VLANs based on the WMM AC received in the Wireless frame • QoS values are marked depending on the frame type egressing the Access Point: • 802.1q tagged IP or Non-IP frames will be marked using 802.1p in the Ethernet header • Untagged IP frames will be marked using DSCP in the IP header • Untagged non-IP Ethernet Frames cannot be marked • WMM  Wired QoS values are determined based on the QoS mapping table • DSCP values marked by the Wireless Client are maintained Access Point (Layer 3) Access Point (Layer 3) Handset QoS Aware Switch Handset 802.1Q Untagged WMM DSCP 802.1p DSCP 802.1p WMM

  13. Wired QoS Mappings (Wired  Wireless) • Traffic originating from the wired network requires 802.1P or DSCP QoS markings to be forwarded out of the appropriate hardware queues on the Access Point radios • If the wired traffic is not previously marked, Wireless Controllers and Access Points can optionally mark inbound wired traffic using IP and MAC Firewall rules applied to physical Ports and Virtual IP interfaces • The Access Points use the QoS mapping table to place the traffic in the appropriate hardware queue before scheduling and forwarding Access Point (Layer 3) Handset Wireless Controller PBX Untagged MiNT Traffic can be marked by the wired device Traffic can be marked by a firewall rule WMM DSCP DSCP DSCP DSCP

  14. Describe key WLAN and radio QoS polices • Describe QoS radio hardware queues • Identify the Default QoS Mapping tables • Discuss the typed of QoS Mappings • Module Summary

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