For balancing DHCP server usage, a good practice is to use the "80/20" rule to divide the IP addresses in a scope between ...

For balancing DHCP server usage, a good practice is to use the "80/20" rule to divide the IP addresses in a scope between two DHCP servers. If the first DHCP server is configured to make available most (approximately 80 percent) of the addresses, then the second DHCP server can be configured to make the other addresses (approximately 20 percent) available to clients.