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I'm experiencing the same issue here but even weird. Sometimes I can spawn several VMs without any issues, sometimes I can spawn only one and only services restart helps. Behaviour is like unpredictable. I'm using openvswitch plugin with vlans. I've tried both linuxnet_interface_driver=nova.network.linux_net.LinuxOVSInterfaceDriver and deprecated libvirt_vif_driver=nova.virt.libvirt.vif.LibvirtHybridOVSBridgeDriver

A workaroung mentioned above: vif_plugging_timeout = 10 vif_plugging_is_fatal = False

seems helps and networking is ok. There is interface attached with assigned ip. May 1 05:01:32 cirros kern.info kernel: [ 0.958597] e1000: Intel(R) PRO/1000 Network Driver - version 7.3.21-k8-NAPI May 1 05:01:32 cirros kern.info kernel: [ 0.958600] e1000: Copyright (c) 1999-2006 Intel Corporation.

But that's all looks like a bug. I'm on Wheezy though.