clusterCIDRs := strings.Split(strings.TrimSpace(config.ClusterCIDR), ",")
		for family, cidrs := range proxyutil.MapCIDRsByIPFamily(clusterCIDRs) {
			localDetectors[family] = proxyutil.NewDetectLocalByCIDR(cidrs[0].String())
		}
		if !localDetectors[primaryIPFamily].IsImplemented() {

	allocatorType ipam.CIDRAllocatorType) (*Controller, error) {

	if kubeClient == nil {
		return nil, fmt.Errorf("kubeClient is nil when starting Controller")
	}

	// Cloud CIDR allocator does not rely on clusterCIDR or nodeCIDRMaskSize for allocation.
	if allocatorType != ipam.CloudAllocatorType {
		if len(clusterCIDRs) == 0 {
			return nil, fmt.Errorf("Controller: Must specify --cluster-cidr if --allocate-node-cidrs is set")
		}

- Removed the networking `alpha` API `ClusterCIDR`. ([#121229](https://github.com/kubernetes/kubernetes/pull/121229), [@aojea](https://github.com/aojea))

### API Change

- '`kube-apiserver`: adds `--authentication-config` flag for reading `AuthenticationConfiguration`

							Default:     "",
							Type:        []string{"string"},
							Format:      "",
						},
					},
					"ClusterCIDR": {
						SchemaProps: spec.SchemaProps{
							Description: "clusterCIDR is CIDR Range for Pods in cluster.",
							Default:     "",
							Type:        []string{"string"},
							Format:      "",
						},
					},