route_stack.pop_back();
if (hierarchy_ == RoutingMode::recursive && prev_dst_gw != nullptr &&
prev_dst_gw->get_cname() != e_route->gw_src->get_cname()) {
route_stack.pop_back();
if (hierarchy_ == RoutingMode::recursive && prev_dst_gw != nullptr &&
prev_dst_gw->get_cname() != e_route->gw_src->get_cname()) {