Packet-optical Integration (POI) of networks has been implemented in various ways. O3 Orchestrator Suite, which is the framework that manages virtual resources in the multilayer network and reports changes to resources to the OpenFlow controller, has been used as the framework in most deployments.

There exist two implementations, which are Optical Core Network Resource Manager (OCNRM) and the OpenFlow agent implementation:

• OCNRM: In the OCNRM implementation, the layer 0 and layer 1 resources of the optical networks are virtualized and then registered with the ODENOS. These resources get managed by the OCNRM in collaboration with the ODENOS. Division is made in the network into two virtual network resources, the Lower Order (LO) unit and the Higher Upper (HO) unit. The LO is mapped to the client signal and the HO is mapped to the LO. The LO ODU corresponds to the ODU layer (L1), and the HO ODU to the optical channel layer (L0). The architecture of this setup is diagrammatically represented as follows:

• OpenFlow agent: In this implementation, OpenFlow messages are translated into information used by existing optical network elements (NEs). The OpenFlow agent is responsible for the translation: it translates OpenFlow messages into optical Transaction Language 1 (TL1) commands, which are used to control the OTN nodes with OpenFlow. The architecture of this setup is diagrammatically represented as follows: