SmartFabric-based network follows the same rules and requirements as a standard multi-tier network that spans across racks. The following standards apply to a SmartFabric-based network topology:
- Connections within racks from the VxRail nodes to the leaf switches is Layer 2.
- The two leaf switches in each rack are configured with Virtual Link Trunking (VLT) to support active connectivity with multipathing and load balancing, and provides fault tolerance.
- VxRail nodes connect only to the leaf switches, and never to the spine switches
- Each leaf switch connects to every spine switch in the network topology. This means the total number of connections between the leaf and spine tiers is equal to the total number of leaf switches multiplied by the number of spine switches in the network.
- The overlay and underlay networks that are created by SFS to support VxLAN tunneling use isolated Layer 3 routed networks between the leaf layer and the spine layer.
- Spine switches are never connected to each other in the Layer 3 based network topology required for SmartFabric.
- Equal cost multipath routing (ECMP) is used to load balance traffic across the leaf switches and spine switches in the isolated Layer 3 routed network.