How to use external DHCP server for an instance in a neutron provider network

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Issue

How to get an instance to use an external dhcp server
vm on external dhcp server
Use external dhcp server instead of having dhcp enabled in the neutron network
instance external dhcp
Instance in tenant network has a fixed ip from the external network.
port security
port_security
port-security

Environment

Red Hat OpenStack Platform 7.0
Red Hat OpenStack Platform 8.0

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