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The Internet's interdomain routing architecture has undergone only minor changes since its inception. It presents issues difficult to solve such as the difficulty in deploying new features, understanding its behavior and dynamics, and identification and faults correction. Efforts have been made to address these issues but implementation of new applications onto the Internet architecture is a hard task due to the need to deploy directly to routers; a task that is compounded by the requirement of global acceptance of new protocols and modifications. This work presents the Inter-SDN component, a novel mechanism to provide interdomain routing using the Software-Defined Networking (SDN) approach. We discuss the main issues of current interdomain routing, describe the Inter-SDN component, its behavior and experimental evaluation. We also demonstrate that building interdomain mechanisms through the SDN approach is not complex, and discuss how our solution takes advantage of SDN features to address issues on interdomain routing.