},
		{Cluster: "cluster1b"}: {
			{Network: "network1", Address: "10.0.0.2"},
		},

		// network2 has an imbalance of endpoints between its clusters
		{Cluster: "cluster2a"}: {
			{Network: "network2", Address: "20.0.0.1"},
		},
		{Cluster: "cluster2b"}: {
			{Network: "network2", Address: "20.0.0.2"},
			{Network: "network2", Address: "20.0.0.3"},
		},

		// network3 has no endpoints.

	// copy old networks if they exist
	c := map[string]*meshconfig.Network{}
	if meshNetworks != nil {
		for k, v := range meshNetworks.Networks {
			c[k] = v
		}
	}
	// add the new one
	c[string(id)] = network
	server.Env().NetworksWatcher.SetNetworks(&meshconfig.MeshNetworks{Networks: c})
}

func getLbEndpointAddrs(eps []*endpoint.LbEndpoint) []string {
	addrs := make([]string, 0)

	// This is defined by a topology.istio.io/network label on the system namespace.
	network network.ID
	// Network name for the registry as specified by the MeshNetworks configmap
	networkFromMeshConfig network.ID
	// map of svc fqdn to partially built network gateways; the actual gateways will be built from these into networkGatewaysBySvc
	// this map just enumerates which networks/ports each Service is a gateway for

 * subtype of {@code Network} that provides methods for adding and removing nodes and edges. If you
 * do not need to mutate a network (e.g. if you write a method than runs a read-only algorithm on
 * the network), you should use the non-mutating {@link Network} interface, or an {@link
 * ImmutableNetwork}.
 *
 * <p>You can create an immutable copy of an existing {@code Network} using {@link
 * ImmutableNetwork#copyOf(Network)}:

 * subtype of {@code Network} that provides methods for adding and removing nodes and edges. If you
 * do not need to mutate a network (e.g. if you write a method than runs a read-only algorithm on
 * the network), you should use the non-mutating {@link Network} interface, or an {@link
 * ImmutableNetwork}.
 *
 * <p>You can create an immutable copy of an existing {@code Network} using {@link
 * ImmutableNetwork#copyOf(Network)}:

	"istio.io/istio/pkg/cluster"
	"istio.io/istio/pkg/network"
	"istio.io/istio/pkg/slices"
	"istio.io/istio/pkg/util/istiomultierror"
	netutil "istio.io/istio/pkg/util/net"
	"istio.io/istio/pkg/util/sets"
)

// NetworkGateway is the gateway of a network
type NetworkGateway struct {
	// Network is the ID of the network where this Gateway resides.
	Network network.ID

		}
	default:
		return UnknownNetworkError(network)
	}
	return nil
}

func checkSecondListener(network, address string, err error) error {
	switch network {
	case "tcp", "tcp4", "tcp6":
		if err == nil {
			return fmt.Errorf("%s should fail", network+" "+address)
		}
	case "udp", "udp4", "udp6":
		if err == nil {
			return fmt.Errorf("%s should fail", network+" "+address)
		}
	default:

    # value.
    meshID: ""
    # Configure the mesh networks to be used by the Split Horizon EDS.
    #
    # The following example defines two networks with different endpoints association methods.
    # For `network1` all endpoints that their IP belongs to the provided CIDR range will be
    # mapped to network1. The gateway for this network example is specified by its public IP
    # address and port.

    # value.
    meshID: ""

    # Configure the mesh networks to be used by the Split Horizon EDS.
    #
    # The following example defines two networks with different endpoints association methods.
    # For `network1` all endpoints that their IP belongs to the provided CIDR range will be
    # mapped to network1. The gateway for this network example is specified by its public IP
    # address and port.

	yml := `
networks:
  network1:
    endpoints:
    - fromCidr: "192.168.0.1/24"
    gateways:
    - address: 1.1.1.1
      port: 80
  network2:
    endpoints:
    - fromRegistry: reg1
    gateways:
    - registryServiceName: reg1
      port: 443
`

	want := mesh.EmptyMeshNetworks()
	want.Networks = map[string]*meshconfig.Network{
		"network1": {