setting the minikube flanneld configuration

Question

I have been starting minikube with:

./minikube start --cni flannel --enable-default-cni --container-runtime=docker --driver=docker --nodes 3

However, this does not start the vxlan backend. I need the vxlan backend.

minikube should support the vxlan backend now.

My flanneld vxlan config is:

flannel-config.json

{
  "Network": "10.244.0.0/16",
  "SubnetLen": 24,
  "Backend": {
    "Type": "vxlan",
    "VNI": 1
  }
}

How do I apply this flanneld configuration when I start the cluster? Please assume my cluster has not been started yet.