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The bridge names whichever you have mentioned don't need to be setup for linuxbridge . They are needed only when you configure openvswitch plugin. Especially br-tun is created for gre overlay network which linuxbridge doesn't support at this point

So I would suggest you go for simple flat networking setup . Single bridge would suffice . You can check out the docs.openstack.org for the configurations part.

The bridge names whichever you have mentioned don't need to be setup for linuxbridge linuxbridge(except br00) . They are needed only when you configure openvswitch plugin. Especially br-tun is created for gre overlay network which linuxbridge doesn't support at this point

So I would suggest you go for simple flat networking setup . Single bridge would suffice . You can check out the docs.openstack.org for the configurations part.