xbt_assert(nullptr == xbt_lib_get_or_null(as_router_lib, router->id, ROUTING_ASR_LEVEL),
"Refusing to create a router named '%s': this name already describes a node.", router->id);
xbt_assert(nullptr == xbt_lib_get_or_null(as_router_lib, router->id, ROUTING_ASR_LEVEL),
"Refusing to create a router named '%s': this name already describes a node.", router->id);