diff --git a/ospf6d/ospf6_top.h b/ospf6d/ospf6_top.h
new file mode 100644
index 0000000..4c68756
--- /dev/null
+++ b/ospf6d/ospf6_top.h
@@ -0,0 +1,96 @@
+/*
+ * OSPFv3 Top Level Data Structure
+ * Copyright (C) 1999 Yasuhiro Ohara
+ *
+ * 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 OSPF6_TOP_H
+#define OSPF6_TOP_H
+
+#include "routemap.h"
+
+/* ospfv3 top level data structure */
+struct ospf6
+{
+  /* process id */
+  u_long process_id;
+
+  /* start time */
+  struct timeval starttime;
+
+  /* ospf version must be 3 */
+  unsigned char version;
+
+  /* my router id */
+  u_int32_t router_id;
+
+  /* list of areas */
+  list area_list;
+
+  /* AS scope link state database */
+  struct ospf6_lsdb *lsdb;
+
+  /* redistribute route-map */
+  struct
+  {
+    char *name;
+    struct route_map *map;
+  } rmap[ZEBRA_ROUTE_MAX];
+
+  struct thread *t_route_calculation;
+  u_int stat_route_calculation_execed;
+
+  struct ospf6_route_table *route_table;
+  struct ospf6_route_table *topology_table;
+  struct ospf6_route_table *external_table;
+
+  void (*foreach_area) (struct ospf6 *, void *arg, int val,
+                        void (*func) (void *, int, void *));
+  void (*foreach_if)   (struct ospf6 *, void *arg, int val,
+                        void (*func) (void *, int, void *));
+  void (*foreach_nei)  (struct ospf6 *, void *arg, int val,
+                        void (*func) (void *, int, void *));
+
+  struct thread *maxage_remover;
+
+  list nexthop_list;
+};
+ 
+extern struct ospf6 *ospf6;
+
+/* prototypes */
+int
+ospf6_top_count_neighbor_in_state (u_char state, struct ospf6 *o6);
+
+void
+ospf6_top_schedule_maxage_remover (void *arg, int val, struct ospf6 *o6);
+
+void ospf6_show (struct vty *);
+void ospf6_statistics_show (struct vty *vty, struct ospf6 *o6);
+
+struct ospf6 *ospf6_start ();
+void ospf6_stop ();
+
+void ospf6_delete (struct ospf6 *);
+int ospf6_is_asbr (struct ospf6 *);
+
+void ospf6_top_init ();
+
+#endif /* OSPF6_TOP_H */
+