Most network designs are validated by review: Capable people read the diagram and agree on what will happen when something fails. This session will show an alternative approach using an AI coding assistant: Write the design as a machine-readable spec, have the assistant generate both the Cisco Modeling Labs topology and the failure test plan from that same spec, run the tests, and find out which of your assumptions survive contact with packets.
This session will open with the method: what a spec-driven workflow actually is, what belongs in the spec and what does not, and why the topology and the test plan have to come from one source of truth. It will follow with two demos. The first demo is small enough to follow along at home: a three-node topology built live from a thirty-line spec. The second is a twenty-node dual-site firewall design drawn from a real enterprise internet edge migration, which we will break one component at a time: Pull the site interconnect, kill an edge router, and watch the traffic generator. In the original engagement one of those tests had exposed an inbound blackhole that had already cleared two rounds of human design review. The finding changed the design.
You'll leave with the repository and enough working knowledge to start building and testing your own designs.