Council slides describe the municipal fabric as “Layer 2 everywhere.” What is the accurate IP-fabric correction?
Select an answer to reveal the explanation.
Short Explanation
“Layer 2 everywhere” is a catchy slide and a bad fabric. The underlay is IP; if departments still need L2 adjacency, that is usually an overlay on top. Do not flatten the Clos back into one giant broadcast domain.
Full Explanation
An IP fabric underlay is Layer 3 between leaves and spines. Tenant Layer 2 adjacency, when required, is commonly delivered as an overlay service rather than by extending VLANs across the underlay. MLAG alone does not make the underlay L3-optional. Treating the fabric as one broadcast domain reintroduces the scaling limits Clos designs avoid.