diff --git a/ospf6d/ospf6_ism.h b/ospf6d/ospf6_ism.h
new file mode 100644
index 0000000..12470d9
--- /dev/null
+++ b/ospf6d/ospf6_ism.h
@@ -0,0 +1,53 @@
+/*
+ * 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_ISM_H
+#define OSPF6_ISM_H
+
+/* interface state */
+#define IFS_NONE     0
+#define IFS_DOWN     1
+#define IFS_LOOPBACK 2
+#define IFS_WAITING  3
+#define IFS_PTOP     4
+#define IFS_DROTHER  5
+#define IFS_BDR      6
+#define IFS_DR       7
+#define IFS_MAX      8
+
+
+
+/* Function Prototypes */
+/* interface event */
+int interface_up (struct thread *);
+int interface_down (struct thread *);
+int wait_timer (struct thread *);
+int backup_seen (struct thread *);
+int neighbor_change (struct thread *);
+
+
+#include "ospf6_types.h"
+
+int dr_change (struct ospf6_interface *);
+int ifs_change (state_t, char *, struct ospf6_interface *);
+
+#endif /* OSPF6_ISM_H */
+