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