This paper provides a configuration example on how to configure Wireless LAN Controllers (WLCs) and Lightweight Access Points (LAPs) for multicasting and communication with a multicast enabled wired network. Before Cisco Unified Wireless Network Software Release 3.2, when IP multicast was enabled, the controller delivered multicast packets to wireless LAN (WLAN) clients by making copies of the multicast packets, then forwarded the packets through a unicast Lightweight Access Point Protocol (LWAPP) tunnel to each access point (AP) connected to the controller. Each multicast frame received by the controller from a VLAN on the first hop router was copied and sent over the LWAPP tunnel to each of the APs connected to it.
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