}

	port, ok := svc.Ports.GetByPort(portNum)
	if !ok {
		return nil, fmt.Errorf("cds gen for %s: did not find port %d in service for cluster %s", node.ID, portNum, defaultClusterName)
	}

	return &clusterBuilder{
		node: node,
		push: push,

		defaultClusterName: defaultClusterName,
		hostname:           hostname,
		portNum:            portNum,
		filter:             filter,

		svc:  svc,

	var (
		err        error
		host, port string
		portnum    int
	)
	switch net {
	case "tcp", "tcp4", "tcp6", "udp", "udp4", "udp6":
		if addr != "" {
			if host, port, err = SplitHostPort(addr); err != nil {
				return nil, err
			}
			if portnum, err = r.LookupPort(ctx, net, port); err != nil {
				return nil, err
			}
		}
	case "ip", "ip4", "ip6":