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External switches must have available ports for connections from the existing network to the SFS border leaves (or spines, where applicable). For redundancy, Dell Technologies recommends using two external switches with at least two links per switch to the SmartFabric. Use enough connections to provide bandwidth for the traffic that is expected across these links. If you are using PowerSwitch systems as external switches, configure them as VLT peers.
Note: To find out if a switch brand is supported as an external switch, see the relevant documentation in References.