To prioritize specific application traffic using Cisco Application Visibility and Control (AVC) on a Wireless LAN Controller (WLC), the engineer configures a rule to 'mark' the traffic. This action assigns a Differentiated Services Code Point (DSCP) value, which maps to a pre-defined Quality of Service (QoS) profile (e.g., Platinum, Gold). Network devices use this marking to apply preferential queuing and forwarding, ensuring higher priority for the designated traffic, such as video streams from IP cameras. The other actions available are 'drop' or 'rate-limit', which are used to block or de-prioritize traffic, respectively.

A. permit-ACL: An ACL is a filter to permit or deny traffic based on network addresses and ports, not the primary mechanism for QoS prioritization within an AVC rule.

B. WMM required: Wi-Fi Multimedia (WMM) is a foundational QoS mechanism for the entire WLAN, not a specific action configured within an individual AVC rule to prioritize one application.

D. rate-limit: Rate-limiting restricts the bandwidth for an application. This is an action to de-prioritize or control traffic, which is the opposite of the required prioritization.

1. Cisco Wireless Controller Configuration Guide

Release 8.10: In the chapter "Configuring Quality of Service

" the section "Configuring AVC Profiles (GUI)" outlines the configuration steps. Step 6 explicitly lists the available rule actions: "From the Action drop-down list

choose one of the following actions to be applied to the application traffic: Drop

Mark

Rate-Limit (Ingress)

Rate-Limit (Egress)." The 'Mark' action is used for QoS prioritization.

2. Enterprise Mobility 8.5 Design Guide: In the "Wireless QoS Design" chapter

the "Application Visibility and Control" section states

"The AVC profile contains the different applications and the action to be taken on them. The action can be to drop

mark

or rate-limit the application." It clarifies that marking is the method to assign QoS levels for prioritization. (Cisco Validated Design

Document ID: CVD-1113

Page 138).

3. Application Visibility and Control Deployment Guide: The "Configuring Application Visibility" section details the three possible actions for classified traffic within an AVC profile: drop

mark

and rate-limit. The guide explains that the 'mark' action is used to apply a specific QoS policy to the application's traffic flow. (Document ID: OL-27226-01

"AVC Profile Configuration" section).