OpenStack offical web site has document to explain the existing HA options for networking. I think most of important item is the option 1: multi-host networking mode. This mode avoids from single point of failure when Nova-Network component is down and also eliminate the potential network bottleneck in single-host networking mode.
For more in details, please see the this:
http://docs.openstack.org/trunk/openstack-compute/admin/content/existing-ha-networking-options.html
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