When I change DHCP function of Logical Network from disabled to enabled, is there any impact on existing resources?

When DHCP is enabled, one IP address for logical port for setting (DHCP server port) is required. The lowest unused address in the IP address assignment pool will be automatically delivered.
In addition, there is no impact on existing resources.

DHCP (server address setting function) of Logical Network is a function to set the address to the server menu (Baremetal server / Virtual server).
Unlike general DHCP, as it is a mechanism to pass address information as an indefinite lease based on information on port and subnet, we will set the same IP address every time.
Even if this function is enabled, it is possible to assign an arbitrary IP address permanently.
Please specify an arbitrary address by the address payout function on the port.
Please refer to the following for details.
Service Descriptions - Logical Network - (Reference) Address Assignof Logical Network