For each pair of ports on each node that is supporting a VxRail network that will be enabled for link aggregation, the corresponding pair of switch ports they are connected to must also be configured for link aggregation. The commands to perform this action depend on the switch model and operating system. See the guides provided by your switch vendor for the steps to complete this task.
If you are deploying the VxRail cluster against a customer-supplied virtual distributed switch, this task must be completed before the VxRail initial build operation. If you are deploying the VxRail cluster using the virtual distributed switch included with the product, this activity is performed after the initial cluster build operation is completed.
Dell Technologies published a procedure for the scenarios where link aggregation on the VxRail networks is performed as a Day 2 activity.