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Yes, you are correct that the root cause of the problem is that the XML template is getting populated with an empty bridge name.

Your configuration looks correct. Can you confirm that the nova.conf is used across all hosts? In particular, that all nova-compute nodes have the flag:

libvirt_vif_driver=nova.virt.libvirt.vif.LibvirtHybirdOVSBridgeDriver

Are there any other exceptions further up in the Nova log than the one you show above? Pasting the entire log output from spinning up a single VM would be helpful.

Also, what version of the code are you running? Is this a Folsom release, or something newer?

Thanks for the detailed report.