**Mandatory** on all nodes.
-You can run Ganeti either in "bridged mode" or in "routed mode". In
-bridged mode, the default, the instances network interfaces will be
-attached to a software bridge running in dom0. Xen by default creates
-such a bridge at startup, but your distribution might have a different
-way to do things, and you'll definitely need to manually set it up under
-KVM.
+You can run Ganeti either in "bridged mode", "routed mode" or
+"openvswitch mode". In bridged mode, the default, the instances network
+interfaces will be attached to a software bridge running in dom0. Xen by
+default creates such a bridge at startup, but your distribution might
+have a different way to do things, and you'll definitely need to
+manually set it up under KVM.
Beware that the default name Ganeti uses is ``xen-br0`` (which was used
in Xen 2.0) while Xen 3.0 uses ``xenbr0`` by default. See the
instances, through their interface, in the table you specified (under
KVM, and in the main table under Xen).
+Also for "openvswitch mode" under Xen a custom network script is needed.
+Under KVM everything should work, but you'll need to configure your
+switches outside of Ganeti (as for bridges).
+
.. admonition:: Bridging issues with certain kernels
Some kernel versions (e.g. 2.6.32) have an issue where the bridge
can be added, of course, if needed.
Alternatively, you can create your own OS definitions. See the manpage
-:manpage:`ganeti-os-interface`.
+:manpage:`ganeti-os-interface(7)`.
Initializing the cluster
++++++++++++++++++++++++