openstack heat: Add port to instance based on condition

I want to add port to the instance only if the name is zee_1

template file:

resources:

  vm_port_routable:
    type: OS::Neutron::Port
    properties:
      network: { get_param: abc_routable_net }
      name:
        str_replace:
          template: $stack_$name_routable_port
          params:
            $stack: { get_param: stack }
            $name: { get_param: vm_name }
      security_groups: [{ get_param: security_group }]
      fixed_ips:
        - ip_address: { get_param: port_ip_routable }

  test_vm_port_routable:
    type: OS::Neutron::Port
    properties:

      network: { get_param: test_zee_routable_net }
      name:
        str_replace:
          template: $stack_$name_routable_port
          params:
            $stack: { get_param: stack }
            $name: { get_param: vm_name }
      security_groups: [{ get_param: security_group }]
      fixed_ips:
        - ip_address: { get_param: test_port_ip_routable }

      zee_server:
        type: OS::Nova::Server
        properties:
          block_device_mapping_v2:
            - boot_index: 0
              delete_on_termination: false
              volume_id: { get_resource: root_volume }
              device_name: vda
              device_type: disk
            - boot_index: -1
              delete_on_termination: false
              volume_id: { get_param: backup_volume }
              device_name: vdc
              device_type: disk
          flavor: { get_param: flavor }
          key_name: { get_param: ssh_keypair }
          name: { get_param: vm_name }

          networks:
            - port: { get_resource: vm_port_routable }
            - port: { get_resource: test_vm_port_routable }

I want to add port "test_vm_port_routable" only if name is zee_1....

I tried with below condition but it is giving error :ERROR: The template section is invalid: conditions

conditions:
       create_prod_res: { equal: [{get_param: "vm_name"},"zee_1"]}
resources:

  vm_port_routable:
    type: OS::Neutron::Port
    properties:
      network: { get_param: abc_routable_net }
      name:
        str_replace:
          template: $stack_$name_routable_port
          params:
            $stack: { get_param: stack }
            $name: { get_param: vm_name }
      security_groups: [{ get_param: security_group }]
      fixed_ips:
        - ip_address: { get_param: port_ip_routable }

  test_vm_port_routable:
    type: OS::Neutron::Port
    properties:

      network: { get_param: test_zee_routable_net }
      name:
        str_replace:
          template: $stack_$name_routable_port
          params:
            $stack: { get_param: stack }
            $name: { get_param: vm_name }
      security_groups: [{ get_param: security_group }]
      fixed_ips:
        - ip_address: { get_param: test_port_ip_routable }

      zee_server:
        type: OS::Nova::Server
        properties:
          block_device_mapping_v2:
            - boot_index: 0
              delete_on_termination: false
              volume_id: { get_resource: root_volume }
              device_name: vda
              device_type: disk
            - boot_index: -1
              delete_on_termination: false
              volume_id: { get_param: backup_volume }
              device_name: vdc
              device_type: disk
          flavor: { get_param: flavor }
          key_name: { get_param: ssh_keypair }
          name: { get_param: vm_name }
          condition:create_prod_res  
          networks:
            - port: { get_resource: vm_port_routable }
            - port: { get_resource: test_vm_port_routable }

with the above changes to template it is failing
can some one help me in this .....

If you read the specification, you will note that support for the conditions section was only added in Newton. So you need either:

heat_template_version: newton

Or:

heat_template_version: 2016-10-14

Or the equivalent for a later release. If you're running an openstack release earlier than Newton, you simply won't be able to use this feature.