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Openstack + Opendaylight + Mininet

I am working on SDN + NFV. I am successfully able to interface ODL and Mininet via Openflow and can see the mininet topology on OpenDayLight controller.

I now want to connect ODL with OpenStack and want to forward packets from the mininet to Openstack, so that openstack would act as a controller and run various networking functions (like VPN, Firewall, etc).

Now I am confused on how the integration works, I have followed Madhu's and Brents tutorials on ODL+Openstack integration from networkstatic blog, but still I dont understand how the communication actually works, how does the packets flow to ODL and how does they come back. I know there is neutron ML2 plugin which does it.

So can anyone help me with it? I mean do i have to write another plugin if I want to take a packet from mininet -> ODL -> OpenStack and back?