There should be at least one virtual switch configured.
TBD: Figure out what kind of virtual witch is required for minishift to work. SOme insights are available here https://github.com/minishift/minishift/issues/107#issuecomment-249658360.

The actual code where the hyper-v driver is configured is in https://github.com/jimmidyson/minishift/blob/master/pkg/minikube/cluster/cluster_windows.go. You can see the options being passed to the driver. Details on the options are at https://docs.docker.com/machine/drivers/hyper-v/ & https://github.com/docker/machine/blob/master/drivers/hyperv/hyperv.go.