diff --git a/isisd/isis_flags.c b/isisd/isis_flags.c
new file mode 100644
index 0000000..716bee0
--- /dev/null
+++ b/isisd/isis_flags.c
@@ -0,0 +1,71 @@
+/*
+ * IS-IS Rout(e)ing protocol - isis_flags.c
+ *                             Routines for manipulation of SSN and SRM flags
+ *
+ * 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.
+ */
+
+
+#include <zebra.h>
+#include "log.h"
+#include "linklist.h"
+
+#include "isisd/isis_constants.h"
+#include "isisd/isis_common.h"
+#include "isisd/isis_flags.h"
+
+int
+flags_get_index (struct flags *flags) 
+{
+  struct listnode *node;
+  int index;
+
+  if (flags->free_idcs == NULL || flags->free_idcs->count == 0) {
+    flags->maxindex++;
+    index = flags->maxindex;
+  } else {
+    node = listhead (flags->free_idcs);
+    index = (int) getdata (node);
+    listnode_delete (flags->free_idcs, (void *)index);
+  }
+  
+  return index;
+}
+
+void 
+flags_free_index (struct flags *flags, int index) 
+{
+  if (flags->free_idcs == NULL) {
+    flags->free_idcs = list_new ();
+  }
+  
+  listnode_add (flags->free_idcs, (void *)index);
+  
+  return;
+}
+
+int  
+flags_any_set (u_int32_t *flags)
+{
+
+  u_int32_t zero[ISIS_MAX_CIRCUITS]; 
+  memset (zero, 0x00, ISIS_MAX_CIRCUITS*4); 
+
+  return bcmp(flags, zero, ISIS_MAX_CIRCUITS*4);
+}