if (! src->isRouter()) {
previous = new_xbt_graph_node(graph, src->name(), nodes);
info = xbt_dynar_get_as(privateLinks_, src->id(), s_surf_parsing_link_up_down_t);
if (info.linkUp) { // link up
if (! src->isRouter()) {
previous = new_xbt_graph_node(graph, src->name(), nodes);
info = xbt_dynar_get_as(privateLinks_, src->id(), s_surf_parsing_link_up_down_t);
if (info.linkUp) { // link up