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Software-Defined-eXchanges (SDXes) promise to tackle the timely quest ofbringing improving the inter-domain routing ecosystem through SDN deployment.Yet, the naive deployment of SDN on the Internet raises concerns about thecorrectness of the inter-domain data-plane. By allowing operators to deflecttraffic from the default BGP route, SDN policies are susceptible of creatingpermanent forwarding loops invisible to the control-plane.  In this paper, we propose a system, called Prelude, for detecting SDN-inducedforwarding loops between SDXes with high accuracy without leaking the privaterouting information of network operators. To achieve this, we leverage SecureMulti-Party Computation (SMPC) techniques to build a novel and generalprivacy-preserving primitive that detects whether any subset of SDN rules mightaffect the same portion of traffic without learning anything about those rules.We then leverage that primitive as the main building block of a distributedsystem tailored to detect forwarding loops among any set of SDXes. We leveragethe particular nature of SDXes to further improve the efficiency of our SMPCsolution.  The number of valid SDN rules, i.e., not creating loops, rejected by oursolution is 100x lower than previous privacy-preserving solutions, and alsoprovides better privacy guarantees. Furthermore, our solution naturallyprovides network operators with some hindsight on the cost of the deflectedpaths.

Prelude: Ensuring Inter-Domain Loop-Freedom in~SDN-Enabled Networks