Explanation
Each instance of VRRP running on a supported interface may monitor the link state of other interfaces. The
monitored interfaces do not have to be running VRRP.
If a monitored interface loses its link state, then VRRP will decrement its priority over a VRID by the
specified delta value and then will send out a new VRRP HELLO packet. If the new effective priority is less
than the priority a backup platform has, then the backup platform will beging to send out its own HELLO
packet.
Once the master sees this packet with a priority greater than its own, then it releases the VIP.

Explanation/Reference:
Explanation:
Synchronization works in two modes:
Full Sync transfers all Security Gateway kernel table information from one cluster member to another. It is handled by the fwd daemon using an encrypted TCP connection on port 256.
Delta Sync transfers changes in the kernel tables between cluster members. Delta sync is handled by the Security Gateway kernel using UDP connections on port 8116.
Reference: https://sc1.checkpoint.com/documents/R80.10/WebAdminGuides/EN/ CP_R80.10_ClusterXL_AdminGuide/html_frameset.htm?topic=documents/R80.10/WebAdminGuides/EN/ CP_R80.10_ClusterXL_AdminGuide/7288