The topology is divided into two major parts:
The production topology contains redundant components and is used for all mission-critical and end-user network traffic. A leaf-spine fabric is used for performance and scalability. SmartFabric Services (SFS) automates the deployment of this fabric.
With SmartFabric, two leaf switches are used in each rack for redundancy and performance. A Dell EMC Virtual-Link Trunking interconnect (VLTi) connects each pair of leaf switches. Every leaf switch is connected to every spine switch in the fabric using Inter Switch Links (ISL). Equal-Cost Multi routing (ECMP) is leveraged to utilize all available bandwidth on the leaf-spine connections.
SmartFabric uses BGP-EVPN to stretch L2 networks across the L3 leaf-spine fabric. This allows for the scalability of L3 networks with the VM mobility benefits of an L2 network. A VM can be migrated from one rack to another without the need to change its IP address and gateway information.
While the entire fabric may be deployed at once, the example in this guide builds the fabric shown in Figure 12 in two stages: