diff --git a/isisd/isis_dynhn.h b/isisd/isis_dynhn.h
new file mode 100644
index 0000000..2a7f3ec
--- /dev/null
+++ b/isisd/isis_dynhn.h
@@ -0,0 +1,42 @@
+/*
+ * IS-IS Rout(e)ing protocol - isis_dynhn.h
+ *                             Dynamic hostname cache
+ *
+ * Copyright (C) 2001,2002   Sampo Saaristo
+ *                           Tampere University of Technology      
+ *                           Institute of Communications Engineering
+ *
+ * This program is free software; you can redistribute it and/or modify it 
+ * under the terms of the GNU General Public Licenseas published by the Free 
+ * Software Foundation; either version 2 of the License, or (at your option) 
+ * any later version.
+ *
+ * This program 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 this program; if not, write to the Free Software Foundation, Inc., 
+ * 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.
+ */
+#ifndef _ZEBRA_ISIS_DYNHN_H
+#define _ZEBRA_ISIS_DYNHN_H
+
+struct isis_dynhn {
+  u_char id[ISIS_SYS_ID_LEN];
+  struct hostname name;
+  time_t refresh;
+  int level;
+};
+
+void dyn_cache_init (void);
+void isis_dynhn_insert (u_char *id, struct hostname *hostname, int level);
+struct isis_dynhn *dynhn_find_by_id (u_char * id);
+void  dynhn_print_all (struct vty *vty);
+
+#endif /* _ZEBRA_ISIS_DYNHN_H */
+
+
+
+