xbt_lib_foreach(as_router_lib, cursor_dst, dst, value2){ //to router
value2 = (sg_netcard_t)xbt_lib_get_or_null(as_router_lib,dst,ROUTING_ASR_LEVEL);
if(value2->isRouter()){
xbt_lib_foreach(as_router_lib, cursor_dst, dst, value2){ //to router
value2 = (sg_netcard_t)xbt_lib_get_or_null(as_router_lib,dst,ROUTING_ASR_LEVEL);
if(value2->isRouter()){