previous = star_node;
for (auto const* link : routes_[src->id()].links_down) {
xbt_node_t current = new_xbt_graph_node(graph, link->get_cname(), nodes);
previous = star_node;
for (auto const* link : routes_[src->id()].links_down) {
xbt_node_t current = new_xbt_graph_node(graph, link->get_cname(), nodes);