ClusterName = env.Register("CLUSTER_ID", constants.DefaultClusterName,
		"Defines the cluster and service registry that this Istiod instance belongs to").Get()

	ExternalIstiod = env.Register("EXTERNAL_ISTIOD", false,
		"If this is set to true, one Istiod will control remote clusters including CA.").Get()

	EnableCAServer = env.Register("ENABLE_CA_SERVER", true,

	if i.ctx.Environment().IsMultiCluster() {
		if i.externalControlPlane || i.cfg.IstiodlessRemotes {
			// Enable namespace controller writing to remote clusters
			args.AppendSet("values.pilot.env.EXTERNAL_ISTIOD", "true")
		}

		// Set the clusterName for the local cluster.
		// This MUST match the clusterName in the remote secret for this cluster.
		clusterName := c.Name()
		if !c.IsConfig() {