[neutron][lbaas][octavia] How to implement health check using 100.64.0.0/10 network segments in loadbalancer?

There are some private cloud or public cloud introduction: They use 100.64.0.0/14 network segments to check vm's health status in load balancer. In Region supporting VPC, load balancing private network IP and health check IP will be switched to 100 network segment. I can't understand how to implement it. How to do it? --