With the network abstractions, VTN enables to configure virtual network across multiple SDN controllers. This provides highly scalable network system.
VTN can be created on each SDN controller. If users would like to manage those multiple VTNs with one policy, those VTNs can be integrated to a single VTN.
As a use case, this feature is deployed to multi data center environment. Even if those data centers are geographically separated and controlled with different controllers, a single policy virtual network can be realized with VTN.
Also, one can easily add a new SDN Controller to an existing VTN or delete a particular SDN Controller from VTN.
In addition to this, one can define a VTN which covers both OpenFlow network and Overlay network at the same time.
Flow Filter, which is set on the VTN, will be automatically applied on the newly added SDN Controller.
