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Network functions virtualization (NFV) allows operators to employ NF chainsto realize custom policies, and dynamically add instances to meet demand or forfailover. NFs maintain detailed per- and cross-flow state which needs carefulmanagement, especially during dynamic actions. Crucially, state managementmust: (1) ensure NF chain-wide correctness and (2) have good performance. Tothis end, we built \name, an NFV framework that leverages an external statestore coupled with state management algorithms and metadata maintenance forcorrect operation even under a range of failures. Our evaluation shows that CHCcan support ~10Gbps per-NF throughput and <0.6mus increase in median per-NFpacket processing latency, and chain-wide correctness at little additionalcost.

Correctness and Performance for Stateful Chained Network Functions