The ClusterXL Control Protocol (CCP) on the cluster members uses multicast by default, because it is more efficient than broadcast.
If the connecting switch is incapable of forwarding multicast traffic, it is possible to change the CCP mode to broadcast. To change the CCP mode to broadcast, run:
cphaconf set_ccp broadcast
To change back to multicast, run the following command:
cphaconf set_ccp multicast