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with no valid physical interface, instance are created in nova

Hi, I am beginner to openstack I have 2node setup with one controller and one compute.

I have one physical interface eth0 for the management network and eth1 is not connected to any port. But in nova.conf file the values are provided as flat_interface = eth1 public_interface = eth1 and the br100 is mapped with eth1(no physical interface) and still the vm's are created successfully without any errors.

Is this the correct behaviour, even without any physical interface the VM's are created successfully without any errors.

can anybody please tell me how the VM are created without the physical interface. -Divya