Huawei’s data center design guidelines emphasize that spine-leaf architecture is a flattened, two-layer fabric designed to overcome the limitations of traditional three-tier networks. One of its key advantages is low and predictable oversubscription ratios , achieved through equal-cost multi-path (ECMP) forwarding and uniform link distribution.
Option A is correct as an advantage because spine-leaf enables resource pooling across zones , eliminating isolated silos and improving utilization. Option C is also a core benefit: the architecture provides high reliability, redundancy, and scalable east-west traffic capacity , which is critical for cloud and distributed applications. Option D reflects the fundamental design principle where each leaf connects to multiple spine switches , ensuring full-mesh reachability and consistent latency.
However, Option B states that the architecture has a high oversubscription ratio , which contradicts Huawei best practices. In fact, spine-leaf is specifically designed to minimize oversubscription , ensuring balanced traffic and predictable performance.
Therefore, B is not an advantage , making it the correct answer.
