+extern const struct frr_yang_module_info frr_isisd_info;
+extern void isis_northbound_init(void);
+
+/* YANG northbound notifications */
+extern void isis_notif_db_overload(const struct isis_area *area, bool overload);
+extern void isis_notif_lsp_too_large(const struct isis_circuit *circuit,
+ uint32_t pdu_size, const char *lsp_id);