In a Virtualized Campus Network (Fabric) , Huawei recommends Distributed Gateway deployment. In this model, the Layer 3 gateway functionality for a tenant is moved down to the Edge nodes (Access or Aggregation switches). This ensures that "East-West" traffic (communication between devices in the same subnet but on different switches) is routed locally at the edge, preventing traffic from having to travel up to a centralized core and back down, thus reducing latency and avoiding bottlenecks.
The Huawei Xinghe Intelligent Campus leverages SDN to deliver four core benefits:
Open Programmability (A): Via Northbound APIs for integration with 3rd-party apps.
Network Automation (B): Automating full-lifecycle O & M.
Rapid Service Provisioning (C): Reducing deployment time from weeks to minutes via templates.
Network Virtualization (D): Using VXLAN/EVPN to create multiple isolated logical networks (e.g., IoT, Office, Security) on a single physical infrastructure.
Stacking (iStack) is a key reliability technology for the access and aggregation layers. By connecting multiple switches into a single logical unit, the network gains device-level redundancy . If one switch in the stack fails, the other member switches continue to forward traffic. Furthermore, it allows for the use of Inter-device Eth-Trunk (link aggregation across different physical switches), which prevents loops without the need for STP, leading to faster convergence and higher network availability.
