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Mission critical systems deployed in data centers today are facing moresophisticated failures. Byzantine fault tolerant (BFT) protocols are capable ofmasking these types of failures, but are rarely deployed due to theirperformance cost and complexity. In this work, we propose a new approach todesigning high performance BFT protocols in data centers. By re-examining theordering responsibility between the network and the BFT protocol, we advocate anew abstraction offered by the data center network infrastructure. Concretely,we design a new authenticated ordered multicast primitive (AOM) that providestransferable authentication and non-equivocation guarantees. Feasibility of thedesign is demonstrated by two hardware implementations of AOM -- one using HMACand the other using public key cryptography for authentication -- onnew-generation programmable switches. We then co-design a new BFT protocol,Matrix, that leverages the guarantees of AOM to eliminate cross-replicacoordination and authentication in the common case. Evaluation results showthat Matrix outperforms state-of-the-art protocols on both latency andthroughput metrics by a wide margin, demonstrating the benefit of our newnetwork ordering abstraction for BFT systems.

The Case for Accelerating BFT Protocols Using In-Network Ordering