+extern xbt_lib_t storage_lib;
+extern int ROUTING_STORAGE_LEVEL; //Routing storage level
+extern int ROUTING_STORAGE_HOST_LEVEL;
+extern int SURF_STORAGE_LEVEL;
+
+extern xbt_lib_t storage_type_lib;
+extern int ROUTING_STORAGE_TYPE_LEVEL; //Routing storage_type level
+
+/* The callbacks to register for the routing to work */
+void routing_AS_begin(const char *AS_id, const char *wanted_routing_type);
+void routing_AS_end(void);
+