In ClusterXL Load Sharing Multicast Mode:

 In ClusterXL Load Sharing Multicast Mode, every member of the cluster receives all of the packets sent to the cluster IP address. This mode uses multicast MAC addresses to distribute packets to all cluster members. Each member decides whether to accept or reject the packet based on a load balancing algorithm. This mode provides better performance and scalability than Unicast mode, but requires a switch that supports multicast MAC addresses.