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Networks are difficult to configure correctly, and tricky to debug. Theseproblems are accentuated by temporal and stateful behavior. Staticverification, while useful, is ineffectual for detecting behavioral deviationsinduced by hardware faults, security failures, and so on, so dynamic propertymonitoring is also valuable. Unfortunately, existing monitoring and runtimeverification for networks largely focuses on properties about individualpackets (such as connectivity) or requires a digest of all network events besent to a server, incurring enormous cost.  We present a network monitoring system that avoids these problems. Becausetraces of network events correspond well to temporal logic, we use a subset ofMetric First-Order Temporal Logic as the query language. These queries arecompiled down to execute completely on the network switches. This vastlyreduces network load, improves the precision of queries, and decreasesdetection latency. We show the practical feasibility of our work by extending awidely-used software switch and deploying it on networks. Our work alsosuggests improvements to network instruction sets to better support temporalmonitoring.

Compiling Stateful Network Properties for Runtime Verification