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You need to use VLAN Manager with nova-network. To configure VlanManager networking in OpenStack, put the following lines into your nova.conf file:

#We point OpenStack to use VlanManager here: 
network_manager=nova.network.manager.VlanManager 

#Interface on which virtual vlan interfaces will be created:
vlan_interface=eth0 

#The first tag number for private vlans 
#(in this case, vlan numbers lower than 100 can serve our
#internal purposes and will not be consumed by tenants):
vlan_start=100

You can use the same manual for using multinic http://docs.openstack.org/admin-guide-cloud/content/using-multiple-nics-usage.html