Multi-controller collaborative interconnecting for multilayer heterogeneous SDON

With the rapid development of converged network technology, the network shows an obvious trend to be heterogeneous. In order to solve this problem, this paper proposes a multi-controller collaborative interconnection architecture for multilayer heterogeneous SDON (Software Defined Optical Network). And to enable this architecture, OpenFlow protocol is extended accordingly. Furthermore, the inter-domain path construction under the control of multiple controller is described to illustrate the collaborative interconnecting.