diff --git a/ospfd/ospf_nsm.h b/ospfd/ospf_nsm.h
new file mode 100644
index 0000000..3d25730
--- /dev/null
+++ b/ospfd/ospf_nsm.h
@@ -0,0 +1,91 @@
+/*
+ * OSPF version 2  Neighbor State Machine
+ *   From RFC2328 [OSPF Version 2]
+ *   Copyright (C) 1999 Toshiaki Takada
+ *
+ * This file is part of GNU Zebra.
+ *
+ * GNU Zebra is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License as published by the
+ * Free Software Foundation; either version 2, or (at your option) any
+ * later version.
+ *
+ * GNU Zebra is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with GNU Zebra; see the file COPYING.  If not, write to the Free
+ * Software Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA
+ * 02111-1307, USA.
+ */
+
+#ifndef _ZEBRA_OSPF_NSM_H
+#define _ZEBRA_OSPF_NSM_H
+
+/* OSPF Neighbor State Machine State. */
+#define NSM_DependUpon          0
+#define NSM_Down		1
+#define NSM_Attempt		2
+#define NSM_Init		3
+#define NSM_TwoWay		4
+#define NSM_ExStart		5
+#define NSM_Exchange		6
+#define NSM_Loading		7
+#define NSM_Full		8
+#define OSPF_NSM_STATE_MAX      9
+
+/* OSPF Neighbor State Machine Event. */
+#define NSM_NoEvent	        0
+#define NSM_HelloReceived	1
+#define NSM_Start		2
+#define NSM_TwoWayReceived	3
+#define NSM_NegotiationDone	4
+#define NSM_ExchangeDone	5
+#define NSM_BadLSReq		6
+#define NSM_LoadingDone		7
+#define NSM_AdjOK		8
+#define NSM_SeqNumberMismatch	9
+#define NSM_OneWayReceived     10
+#define NSM_KillNbr	       11
+#define NSM_InactivityTimer    12
+#define NSM_LLDown	       13
+#define OSPF_NSM_EVENT_MAX     14
+
+/* Macro for OSPF NSM timer turn on. */
+#define OSPF_NSM_TIMER_ON(T,F,V) \
+      do { \
+        if (!(T)) \
+          (T) = thread_add_timer (master, (F), nbr, (V)); \
+      } while (0)
+
+/* Macro for OSPF NSM timer turn off. */
+#define OSPF_NSM_TIMER_OFF(X) \
+      do { \
+        if (X) \
+          { \
+            thread_cancel (X); \
+            (X) = NULL; \
+          } \
+      } while (0)
+
+/* Macro for OSPF NSM schedule event. */
+#define OSPF_NSM_EVENT_SCHEDULE(N,E) \
+      thread_add_event (master, ospf_nsm_event, (N), (E))
+
+/* Macro for OSPF NSM execute event. */
+#define OSPF_NSM_EVENT_EXECUTE(N,E) \
+      thread_execute (master, ospf_nsm_event, (N), (E))
+
+/* Prototypes. */
+int ospf_nsm_event (struct thread *);
+void nsm_change_state (struct ospf_neighbor *, int);
+void ospf_check_nbr_loading (struct ospf_neighbor *);
+int ospf_db_summary_isempty (struct ospf_neighbor *);
+int ospf_db_summary_count (struct ospf_neighbor *);
+void ospf_db_summary_clear (struct ospf_neighbor *);
+/* void ospf_db_summary_delete_all (struct ospf_neighbor *); */
+
+#endif /* _ZEBRA_OSPF_NSM_H */
+