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I am in the same situation. I have installed openstack using devstack. Now I am at the point of linking br-ex interface to an external interface. I have used the above commands (ovs-vsctl , etc) and now I cannot access anymore my external interface only the br-ex interface IP. External interface is setup to use DHCP, is getting the IP but is not accessible from outside. When I am powering on instances they are hanging on powering on state. At the end, I have managed to regain access to external interface using command ovs-vsctl del-port br-ex ens160 Any suggestion to solve this situation ?