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The production topology uses a leaf-spine fabric for performance and scalability. SmartFabric Services (SFS) automates the deployment of this fabric.
Figure 10. SmartFabric topology with connections to VxRail nodes and external network
Note: The deployment examples in this guide use two network adapter ports per VxRail node, as shown in Figure 10. See the Dell EMC VxRail Network Planning Guide for VxRail node connectivity options.
With SFS, two leaf switches are used in each rack for redundancy and performance. A Virtual-Link Trunking interconnect (VLTi) connects each pair of leaf switches. Every leaf switch has an L3 uplink to every spine switch. Equal-Cost Multi-Path routing (ECMP) is leveraged to utilize all available bandwidth on the leaf-spine connections.
SFS 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. For example, a VM can be migrated from one rack to another without the need to change its IP address and gateway information.
The example in this guide builds the SmartFabric shown in Figure 10 in two stages:
Note: Single and multi-rack deployment options are discussed in Chapter 4 - Deployment Planning.