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You may follows in general design from http://lxer.com/module/newswire/view/236967/index.html
or http://dbaxps.blogspot.com/2015/10/rdo-liberty-set-up-for-three-nodes.html

    CONFIG_CONTROLLER_HOST=CONFIG_NETWORK_HOSTS
    eth1 is eth0 
    eth2 is eth0
    On Controller/Network Node
    eth1 is eth0
    On Compute Node

Mgmt, VLXLAN tunnel ant External network should be the same

I would suggest plug in  Controller/Network Node second nic for External Network
for security reasons , avoiding network congestion for South/North packets forwarding 
and splitting South/North and East/West traffics