Within VRRP the election process of becoming the master switch takes place with the following precedence
Step 1 The switch with the virtual router IP address becomes the master switch
Step 2 The switch with the highest VRRP priority becomes the master switch
Step 3 The switch with the highest IP address becomes the master switch
Health checking is used in SLB to determine the health of nodes by activity poling these nodes. The default health check called ping-check will keep working when the switch has an active access-list denying ICMP echo replies.