Hello!

I've faced a weird problem. And I totally can't understand how libvirt
handles networks. The thing that i need to do is simple. I create a bridge
in my ubuntu host, the following config:

*iface eth0 inet manual*
*
*
*auto br0*
*iface br0 inet dhcp*
*  bridge_ports eth0*
*  bridge_stp on*
*  bridge_maxwait 0*

That's OK, and my bridge turns up automatically. But I don't understand why
libvirt can't use it, it always want to create bridge on its own. So that
when I try to create bridged network with the command:
  virsh virsh net-create net.xml

net.xml contents:
* <network>*
*  <name>virbreth0</name>*
*  <bridge name='br0' stp='on' delay='0' />*
* </network>*

I always get error ===>
error: Failed to create network from net.xml
error: cannot create bridge 'br0': File exists

That's pretty obvious that libvirt wants to create bridge on its own. But
what should I do in my specific situation. May be there is a workaround.
I appreciate any help and ideas...

Thanks for your answers.

Best regards,
  Denis Barishev.
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