Before

heat_template_version: '2014-10-16'
resources:
  net1:
    type: OS::Neutron::Net
  subnet1:
    type: OS::Neutron::Subnet
    properties:
      cidr: 10.0.0.0/16
      enable_dhcp: false
      ip_version: 4
      network_id: {get_resource: net1}
  port1:
    type: OS::Neutron::Port
    properties:
      fixed_ips:
      - ip_address: 10.0.0.10
        subnet_id: {get_resource: subnet1}
      network_id: {get_resource: net1}