}

func (c Topology) Primary() Cluster {
	cluster, ok := c.AllClusters[c.PrimaryClusterName]
	if !ok || cluster == nil {
		panic(fmt.Errorf("cannot find %s, the primary cluster for %s", c.PrimaryClusterName, c.Name()))
	}
	return cluster
}

func (c Topology) PrimaryName() string {
	return c.PrimaryClusterName
}

func (c Topology) Config() Cluster {
	cluster, ok := c.AllClusters[c.ConfigClusterName]

    "svcSubnet": "10.255.20.0/24",
    "network": "network-1",
    "primaryClusterName": "external",
    "configClusterName": "config"
  },
  {
    "kind": "Kubernetes",
    "clusterName": "remote",
    "podSubnet": "10.30.0.0/16",
    "svcSubnet": "10.255.30.0/24",
    "network": "network-2",
    "primaryClusterName": "external",
    "configClusterName": "config",
    "meta": {
      "fakeVM": false
    }

    "svcSubnet": "10.255.20.0/24",
    "network": "network-1",
    "primaryClusterName": "external",
    "configClusterName": "config"
  },
  {
    "kind": "Kubernetes",
    "clusterName": "external",
    "podSubnet": "10.10.0.0/16",
    "svcSubnet": "10.255.10.0/24",
    "network": "network-1",
    "primaryClusterName": "external",
    "configClusterName": "config",
    "meta": {
      "fakeVM": false

func validConfig(cfg cluster.Config) (cluster.Config, error) {
	if cfg.Name == "" {
		return cfg, fmt.Errorf("empty cluster name")
	}
	if cfg.PrimaryClusterName == "" {
		cfg.PrimaryClusterName = cfg.Name
	}
	if cfg.ConfigClusterName == "" {
		cfg.ConfigClusterName = cfg.PrimaryClusterName
	}
	if cfg.Meta == nil {
		cfg.Meta = config.Map{}
	}
	return cfg, nil

	Network            string     `yaml:"network,omitempty"`
	HTTPProxy          string     `yaml:"httpProxy,omitempty"`
	ProxyKubectlOnly   bool       `yaml:"proxyKubectlOnly,omitempty"`
	PrimaryClusterName string     `yaml:"primaryClusterName,omitempty"`
	ConfigClusterName  string     `yaml:"configClusterName,omitempty"`
	Meta               config.Map `yaml:"meta,omitempty"`

    "network": "network-1"
  },
  {
    "kind": "Kubernetes",
    "clusterName": "remote",
    "podSubnet": "10.20.0.0/16",
    "svcSubnet": "10.255.20.0/24",
    "network": "network-1",
    "primaryClusterName": "primary",
    "meta": {
      "fakeVM": false
    }
  },
  {
    "kind": "Kubernetes",
    "clusterName": "cross-network-primary",
    "podSubnet": "10.30.0.0/16",
    "svcSubnet": "10.255.30.0/24",

	res := cluster.Clusters{}
	allClusters := make(cluster.Map)

	for i := 0; i < f.NumClusters; i++ {
		topo := cluster.NewTopology(cluster.Config{
			Name:               fmt.Sprintf("cluster-%d", i),
			PrimaryClusterName: fmt.Sprintf("cluster-%d", i),
			ConfigClusterName:  fmt.Sprintf("cluster-%d", i),
		}, allClusters)
		c := &kube.Cluster{Topology: topo}
		res = append(res, c)
		allClusters[c.Name()] = c
	}
	return res
}

		cfg := cluster.Config{
			Name:    fmt.Sprintf("cluster-%d", i),
			Network: s.networkTopology[ci],
			Meta:    config.Map{"kubeconfig": kc},
		}
		if idx, ok := s.controlPlaneTopology[ci]; ok {
			cfg.PrimaryClusterName = fmt.Sprintf("cluster-%d", idx)
		}
		if idx, ok := s.configTopology[ci]; ok {
			cfg.ConfigClusterName = fmt.Sprintf("cluster-%d", idx)
		}
		configs = append(configs, cfg)
	}
	return configs, nil

}

var (
	allClusters = make(cluster.Map)
	// 2 clusters on 2 networks
	cls1 = &kube.Cluster{Topology: cluster.Topology{
		ClusterName:        "cls1",
		Network:            "n1",
		PrimaryClusterName: "cls1",
		ConfigClusterName:  "cls1",
		Index:              0,
		AllClusters:        allClusters,
	}}

	// simple pod
	a1 = &fakeInstance{Cluster: cls1, Namespace: namespace.Static("echo"), Service: "a"}

		ClusterName:        "cls1",
		Network:            "n1",
		PrimaryClusterName: "cls1",
		ConfigClusterName:  "cls1",
		Index:              0,
		AllClusters:        allClusters,
	}}
	cls2 = &kube.Cluster{Topology: cluster.Topology{
		ClusterName:        "cls2",
		Network:            "n2",
		PrimaryClusterName: "cls2",
		ConfigClusterName:  "cls2",
		Index:              1,