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Here are the instructions: http://trickycloud.wordpress.com/2013/11/12/setting-up-a-flat-network-with-neutron/

The gist is that you'll configuring all compute nodes with a new bridge, connected to the physical NIC of the pre-existing network you'd like to use. You'll then configure the OVS agent(s) to know about this new bridge. Then you'll create a new provider network, which is mapped to the physical network you'd like your VMs to connect to. Connect your VMs to this new Neutron provider network, and you're done.