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OpenContrail is a SDN solution which offers additional networking features such as vDNS, IPAM and security ACL on both subnets and individual VM levels. It has a centralized controller serving as control plane and a distributed virtual router serving as forwarding/data plane. OpenContrail vrouter operates on each hypervisor abd VM is attached to the vRouter by VRF (virtual Forward Routing). The forwarding plane supports MPLS over GRE, VXLAN, L2/3 unicase and L3 Multicase for interconnection between virtual and physical networks. This page has excellent architecture overview for OpenContrail.