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Achieving highly reliable networks is essential for network operators toensure proper packet delivery in the event of software errors or hardwarefailures. Networks must ensure reachability and routing correctness, such assubnet isolation and waypoint traversal. Existing work in network verificationrelies on centralized computation at the cost of fault tolerance, while otherapproaches either build an over-engineered, complex control plane, or composemultiple control planes without providing any guarantee on correctness. Thispaper presents Carbide, a novel system to achieve high reliability in networksthrough distributed verification and multiple control plane composition. Thecore of Carbide is a simple, generic, efficient distributed verificationframework that transforms a generic network verification problem to areachability verification problem on a directed acyclic graph (DAG), and solvesthe latter via an efficient distributed verification protocol (DV-protocol).Equipped with verification results, Carbide allows the systematic compositionof multiple control planes and realization of operator-specified consistency.Carbide is fully implemented. Extensive experiments show that (1) Carbidereduces downtime by 43% over the most reliable individual underlying controlplane, while enforcing correctness requirements on all traffic; and (2) bysystematically decomposing computation to devices and pruning unnecessarymessaging between devices during verification, Carbide scales to a productiondata center network.

Carbide: Highly Reliable Networks Through Real-Time Multiple Control Plane Composition