Hi, is there a way to reference on VM1 private IP of VM2 and viceversa?

I found the following exception: ERROR: Remote error: CircularDependencyException Circular Dependency Found: {Server "vm1": {Server "vm2"}, Server "vm2": {Server "vm1"}}

  vm1:
    type: OS::Nova::Server
    properties:
      name: vm1
      image: image1
      flavor: m1.small
      key_name: { get_param: KeyName }
      user_data:                                                        
        str_replace:                                                    
          template: |                                                   
            #!/bin/bash -x
            echo 'nameserver "%vm2_ip%"' | sudo tee -a /etc/resolv.conf
          params:       
            "%vm2_ip%": {get_attr: [vm2, first_address]}
      networks: 
        - port: { get_resource: vm1_port }

  vm2:
    type: OS::Nova::Server
    properties:
      name: vm2
      image: image1
      flavor: m1.small
      key_name: { get_param: KeyName }
      user_data:                                                        
        str_replace:                                                    
          template: |                                                   
            #!/bin/bash -x
            echo 'nameserver "%vm1_ip%"' | sudo tee -a /etc/resolv.conf
          params:       
            "%vm1_ip%": {get_attr: [vm1, first_address]}
      networks: 
        - port: { get_resource: vm2_port }

UPDATE 1 Is anyone aware of a solution to this problem? Could it be possible to cross reference Floating/static IP on resources?

Thanks