© 2006 Cisco Systems, Inc. All rights reserved.ONT v Implement Wireless Scalability Implementing WLAN QoS

© 2006 Cisco Systems, Inc. All rights reserved.ONT v WLAN and LAN Wireless LAN (WLAN) as an extension to wired LAN

© 2006 Cisco Systems, Inc. All rights reserved.ONT v The Need for WLAN QoS

© 2006 Cisco Systems, Inc. All rights reserved.ONT v The Need for QoS Wireless QoS extension to to provide more consistent and quality RF transmission for: Voice Video

© 2006 Cisco Systems, Inc. All rights reserved.ONT v WLAN QoS Description

© 2006 Cisco Systems, Inc. All rights reserved.ONT v WLAN QoS Queuing Overview

© 2006 Cisco Systems, Inc. All rights reserved.ONT v WLAN QoS RF Backoff Timing

© 2006 Cisco Systems, Inc. All rights reserved.ONT v Lightweight Access PointSplit MAC Architecture

© 2006 Cisco Systems, Inc. All rights reserved.ONT v QoS WLAN Deployment Issues Wireless RF is a Layer 2 technology and therefore based on e or WMM, versus Layer 3 DSCP. Layer 2 marking will be lost in end-to-end transient, losing QoS information. Access points connect to switches as access ports versus trunks and lack 802.1p trunk tagging. The goal is to utilize the Layer 3 DSCP information to preserve end-to-end QoS in the absence of Layer 2 QoS information.

© 2006 Cisco Systems, Inc. All rights reserved.ONT v QoS Description WLAN data is tunneled between the access point and WLAN controller via LWAPP. QoS settings of the encapsulated data packet are mapped to the Layer 2 (802.1p) and Layer 3 (IP DSCP) fields of the outer tunnel packet.

© 2006 Cisco Systems, Inc. All rights reserved.ONT v WLAN QoS Implementation

© 2006 Cisco Systems, Inc. All rights reserved.ONT v QoS Implementation Overview

© 2006 Cisco Systems, Inc. All rights reserved.ONT v QoS Implementation Ethernet to Controller

© 2006 Cisco Systems, Inc. All rights reserved.ONT v Feature: QoS Packet-Marking Translations Cisco 802.1p Priority- Based Traffic Type DSCP Priority 802.1p Priority IEEE e Priority Reserved56–62 77 IP routing4867 Voice46 (EF)56 Video34 (AF41)45 Voice control26 (AF 31)34 Background gold18 AF21)22 Background silver10 (AF11)11 Best effort0 (BE)00 or 3

© 2006 Cisco Systems, Inc. All rights reserved.ONT v From Access Point to Wireless Client

© 2006 Cisco Systems, Inc. All rights reserved.ONT v From Client to Access Point

© 2006 Cisco Systems, Inc. All rights reserved.ONT v Traffic from Access Point to Controller The access point will not send tagged packets on a nontrunk port destined for the controller; therefore, the access point will not copy the e client incoming priority value to the 802.1p (outer) destined for the switch.

© 2006 Cisco Systems, Inc. All rights reserved.ONT v From Controller to Ethernet Switch

© 2006 Cisco Systems, Inc. All rights reserved.ONT v QoS Implementation 802.1p or DSCP-tagged packets received from LAN: –Tag is propagated to LWAPP frame. –WLAN ID-configured QoS takes priority for assigned access category; if tag is lower than configured QoS, access point will queue packet at lower access category. –AAA override can be applied to Cisco IBNS WLAN clients. Untagged packets received from LAN: –WLAN ID-configured QoS will be applied for access category. –AAA override can be applied to Cisco IBNS WLAN clients.

© 2006 Cisco Systems, Inc. All rights reserved.ONT v QoS Implementation (Cont.) e QoS packets received from WLAN: –Tag is propagated to LWAPP frame. –WLAN ID-configured QoS takes priority for assigned 802.1p tag; if e access category is lower than configured QoS, lower 802.1p tag will be applied. –802.11e QoS packets received from WLAN will be 802.1p-tagged when transmitted on the LAN by the controller. Non-QoS packets received from WLAN will be best effort (default silver) when transmitted on the LAN by the controller.

© 2006 Cisco Systems, Inc. All rights reserved.ONT v WLAN QoS Configuration

© 2006 Cisco Systems, Inc. All rights reserved.ONT v QoS-Configurable Profiles Each level has a configurable per-bandwidth contract rate: Per-user data bandwidth contractConfigurable peak and average data rate enforcement for non-UDP traffic Per-user real-time bandwidth contractConfigurable peak and average data rate enforcement for UDP traffic

© 2006 Cisco Systems, Inc. All rights reserved.ONT v QoS-Configurable Profiles (Cont.) Each level has configurable over the air QoS rates: Maximum RF usage per access point (%)Defined maximum percentage of air bandwidth given to an access category Queue depthDefined depth of queue for a particular user level that will cause packets in excess of the defined value to be dropped

© 2006 Cisco Systems, Inc. All rights reserved.ONT v QoS-Configurable Profiles (Cont.) The 802.1p tag is applied to the wired side to allow proper precedence to be applied to traffic across the entire network infrastructure.

© 2006 Cisco Systems, Inc. All rights reserved.ONT v Configuring WLAN IDs for QoS

© 2006 Cisco Systems, Inc. All rights reserved.ONT v Summary Video and voice applications are used with wireless clients as well as date applications, and QoS is required for them e or WMM scheduling and queuing is implemented on access points. DCSP and 802.1p tagging is used to tag different types of traffic inside LWAPP tunnels. QoS policies and types of traffic are defined for each WLAN ID in the Wireless LAN Controller.

© 2006 Cisco Systems, Inc. All rights reserved.ONT v