The -MAC magic- value must be modified under the following condition:

A. There is more than one cluster connected to the same VLAN

B. A firewall cluster is configured to use Multicast for CCP traffic

C. There are more than two members in a firewall cluster

D. A firewall cluster is configured to use Broadcast for CCP traffic

Reference: https://supportcenter.checkpoint.com/supportcenter/portal?eventSubmit_doGoviewsolutiondetails=&solutionid=sk25977