echo "Subnet ${IP_ALIAS_SUBNETWORK}'s allowSubnetCidrRoutesOverlap is already set as $1"
    return
  fi

  echo "Setting subnet \"${IP_ALIAS_SUBNETWORK}\" allowSubnetCidrRoutesOverlap to $1"
  local fingerprint
  fingerprint=$(gcloud compute networks subnets describe \
    "${IP_ALIAS_SUBNETWORK}" --project="${PROJECT}" --region="${REGION}" \
    --format='value(fingerprint)')

  IP_ALIAS_SUBNETWORK=${KUBE_GCE_IP_ALIAS_SUBNETWORK:-${INSTANCE_PREFIX}-subnet-default}
  # If we're using custom network, use the subnet we already create for it as the one for ip-alias.
  # Note that this means SUBNETWORK would override KUBE_GCE_IP_ALIAS_SUBNETWORK in case of custom network.
  if [[ "${CREATE_CUSTOM_NETWORK}" = true ]]; then
    IP_ALIAS_SUBNETWORK=${SUBNETWORK}
  fi
  export IP_ALIAS_SIZE

  export IP_ALIAS_SIZE
  IP_ALIAS_SUBNETWORK=${KUBE_GCE_IP_ALIAS_SUBNETWORK:-${INSTANCE_PREFIX}-subnet-default}
  # If we're using custom network, use the subnet we already create for it as the one for ip-alias.
  # Note that this means SUBNETWORK would override KUBE_GCE_IP_ALIAS_SUBNETWORK in case of custom network.
  if [[ "${CREATE_CUSTOM_NETWORK}" == true ]]; then
    export IP_ALIAS_SUBNETWORK="${SUBNETWORK}"
  fi

    --project "${NETWORK_PROJECT}" \
    --region "${REGION}" \
    "${IP_ALIAS_SUBNETWORK}" 2>/dev/null || true)
  if [[ -z "${subnet}" ]]; then
    echo "Creating subnet ${NETWORK}:${IP_ALIAS_SUBNETWORK}"
    gcloud compute networks subnets create \
      "${IP_ALIAS_SUBNETWORK}" \