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OVS is SDN enabled switch or legacy ?

In OpenStack without connected/integrated to any SDN Controller(ODL,ONOS), is OVS functioning as legacy switch or SDN enabled switch? Is it like SDN enabled switch but working as legacy switch ? If it is SDN enabled switch, are there any default flows within it? What are those flows?

Just to my knowledge i understood like switching is handled by neutron-ovs-agent and routing by neutron-l3-agent. How actually they are working? What is the scenario when OpenStack is integrated to SDN Controller in production setups?

Could someone please share some thoughts ?? Any good pointers to get understanding of neutron routing & switching in detail ??

--Thanks