Tiramisu: Fast Multilayer Network Verification

Today's distributed network control planes are highly sophisticated, with multiple interacting protocols operating at layers 2 and 3. The complexity makes network configurations highly complex and bug-prone. State-of-the-art tools that check if control plane bugs can lead to violations of key properties are either too slow, or do not model common network features. We develop a new, general multilayer graph control plane model that enables using fast, property-customized verification algorithms. Our tool, Tiramisu can verify if policies hold under failures for various real-world and synthetic configurations in < 0.08s in small networks and < 2.2s in large networks. Tiramisu is 2-600X faster than state-of-the-art without losing generality.