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Chapter 3

IP Multicast in a Wireless LAN

Summary

Summary

In summary, when using IP multicast in the WLAN, follow these recommendations.

Place the WLAN AP or bridge on a separate VLAN or Layer 3 interface so multicast boundaries can be implemented.

Use the ip multicast boundary command to prevent IGMP joins and multicast forwarding on denied multicast groups.

In a WLAN using AP, the boundary should be placed on the VLAN or Layer 3 interface connecting to the AP.

In a WLAN using bridges, the boundary is placed on the VLAN or Layer 3 interface connecting to the remote receiver side. If no Layer 3 capable device is used at the remote site, the boundary is placed on the VLAN or Layer 3 interface connecting to the bridge at the main site. Also, a combination of a boundary at the receiver side and bridge connection at the main site, may be needed in a P2MP deployment.

Set the highest possible fixed data rate on the APs and bridges to ensure the best possible performance for multicast and data traffic.

If dropped packets occur and impact the performance of the application, the fixed data rate on the APs and bridges may need to be reduced to ensure a better signal-to-noise ratio, which can reduce dropped packets.

Cisco AVVID Network Infrastructure IP Multicast Design

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