The expansion from a single rack fabric to a multi-rack fabric provides the option to keep upstream connectivity at the leaf layer or move upstream connectivity to the spine layer. For upstream connectivity at the leaf layer, a set of leaf switches can be selected to serve as the boundary between the switch fabric and upstream network.
Figure 11. SmartFabric topology for multi-rack with Layer 2 uplinks at leaf layer
For connectivity to the upstream network, either Layer 2 or Layer 3 protocols can be enabled.
Figure 12. VxRail-SmartFabric Topology: Multi-Rack with Layer 3 Leaf Border