300-365 · Question #59
A client reports that video is not streaming. The administrator determines the client is connecting at a data rate of 12 Mbps and is trying to stream to a valid multicast address on the network…
The correct answer is B. Video-stream for the multicast video is configured in the controller. D. WLAN has been configured to allow multicast-direct to work correctly and multicast- direct has E. WLAN has been set for a QoS value of Gold. Troubleshooting wireless multicast video requires verifying the video-stream feature, multicast-direct WLAN configuration, and the correct QoS level (Gold) on the controller.
Question
A client reports that video is not streaming. The administrator determines the client is connecting at a data rate of 12 Mbps and is trying to stream to a valid multicast address on the network. What three items should the administrator check next to troubleshoot the issue? (Choose three)
Options
- AIGMP snooping is turned off because the client cannot request to join a group, only access points
- BVideo-stream for the multicast video is configured in the controller.
- CWLAN has been set for a QoS value of Platinum.
- DWLAN has been configured to allow multicast-direct to work correctly and multicast- direct has
- EWLAN has been set for a QoS value of Gold.
- FRTSP is used to stream the video due to wireless multicast not using acknowledgements.
How the community answered
(38 responses)- A5% (2)
- B61% (23)
- C24% (9)
- F11% (4)
Why each option
Troubleshooting wireless multicast video requires verifying the video-stream feature, multicast-direct WLAN configuration, and the correct QoS level (Gold) on the controller.
IGMP snooping should be enabled, not disabled, so the controller can track which clients have joined a multicast group and direct traffic appropriately.
The Cisco WLC Video Stream feature must be explicitly configured to optimize multicast video delivery to wireless clients, without it the stream will not be properly managed.
Platinum QoS is reserved for voice traffic and uses DSCP EF; using it for video misrepresents traffic priority and wastes the highest-tier queue on non-voice streams.
Multicast-direct must be enabled on the WLAN to allow the controller to convert multicast frames to unicast for each associated client, which is required for reliable wireless multicast delivery.
Gold QoS is the correct WLAN QoS tier for video traffic; it marks frames with DSCP AF41/AF42 and provides the priority queuing appropriate for video without over-allocating voice-level resources.
RTSP is an application-layer signaling protocol and is not a requirement or a valid troubleshooting step for the underlying wireless multicast forwarding problem.
Concept tested: Wireless multicast video stream configuration on WLC
Source: https://www.cisco.com/c/en/us/td/docs/wireless/controller/8-10/config-guide/b_cg810/multicast.html
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