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In this paper, we discuss about how to orchestrate service function chaining (SFC) over geographically distributed cloud-based infrastructure. By introducing an automated inter-connection tool for graph-based SFC with distributed cloud VMs (virtual machines), we attempt to improve the large-scale scalability and underlay-aware efficiency of SFC-leveraged service realization.

In realizing futuristic services with agility, testbed environments that provide converged computing/networking resources based on SDN (Software--Defined Networking) and CC (Cloud Computing) are becoming important. Following this trend, OF@TEIN OpenFlow--enabled SDN testbed environment is built with internationally-distributed unique SmartX Racks. In this paper, to automate the multi-point L2 inter-connections of OpenFlow islands, we design and implement a configuration tool for NVGRE (Network Virtualization using Generic Routing Encapsulation) tunneling. The proposed tool manages the desired topology by leveraging the OVSDB (Open vSwitch Database) configuration interface for OpenFlow switches. With the implemented tool and appropriate admin/user privilege management, we can quickly inter-connect the multi-point international OpenFlow islands while letting users to freely control (i.e., tag/steer/map) their own flows for experimentation.