diff --git a/ospfd/ospf_asbr.c b/ospfd/ospf_asbr.c
new file mode 100644
index 0000000..d13bbc4
--- /dev/null
+++ b/ospfd/ospf_asbr.c
@@ -0,0 +1,287 @@
+/*
+ * OSPF AS Boundary Router functions.
+ * Copyright (C) 1999, 2000 Kunihiro Ishiguro, 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.
+ */
+
+#include <zebra.h>
+
+#include "thread.h"
+#include "memory.h"
+#include "linklist.h"
+#include "prefix.h"
+#include "if.h"
+#include "table.h"
+#include "vty.h"
+#include "filter.h"
+#include "log.h"
+
+#include "ospfd/ospfd.h"
+#include "ospfd/ospf_interface.h"
+#include "ospfd/ospf_asbr.h"
+#include "ospfd/ospf_lsa.h"
+#include "ospfd/ospf_lsdb.h"
+#include "ospfd/ospf_neighbor.h"
+#include "ospfd/ospf_spf.h"
+#include "ospfd/ospf_flood.h"
+#include "ospfd/ospf_route.h"
+#include "ospfd/ospf_zebra.h"
+#include "ospfd/ospf_dump.h"
+
+/* Remove external route. */
+void
+ospf_external_route_remove (struct prefix_ipv4 *p)
+{
+  struct route_node *rn;
+  struct ospf_route *or;
+
+  rn = route_node_lookup (ospf_top->old_external_route, (struct prefix *) p);
+  if (rn)
+    if ((or = rn->info))
+      {
+	zlog_info ("Route[%s/%d]: external path deleted",
+		   inet_ntoa (p->prefix), p->prefixlen);
+
+	/* Remove route from zebra. */
+        if (or->type == OSPF_DESTINATION_NETWORK)
+	  ospf_zebra_delete ((struct prefix_ipv4 *) &rn->p, or);
+
+	ospf_route_free (or);
+	rn->info = NULL;
+
+	route_unlock_node (rn);
+	route_unlock_node (rn);
+	return;
+      }
+
+  zlog_info ("Route[%s/%d]: no such external path",
+	     inet_ntoa (p->prefix), p->prefixlen);
+}
+
+/* Lookup external route. */
+struct ospf_route *
+ospf_external_route_lookup (struct prefix_ipv4 *p)
+{
+  struct route_node *rn;
+
+  rn = route_node_lookup (ospf_top->old_external_route, (struct prefix *) p);
+  if (rn)
+    {
+      route_unlock_node (rn);
+      if (rn->info)
+	return rn->info;
+    }
+
+  zlog_warn ("Route[%s/%d]: lookup, no such prefix",
+	     inet_ntoa (p->prefix), p->prefixlen);
+
+  return NULL;
+}
+
+
+/* Add an External info for AS-external-LSA. */
+struct external_info *
+ospf_external_info_new (u_char type)
+{
+  struct external_info *new;
+
+  new = (struct external_info *)
+    XMALLOC (MTYPE_OSPF_EXTERNAL_INFO, sizeof (struct external_info));
+  memset (new, 0, sizeof (struct external_info));
+  new->type = type;
+
+  ospf_reset_route_map_set_values (&new->route_map_set);
+  return new;
+}
+
+void
+ospf_external_info_free (struct external_info *ei)
+{
+  XFREE (MTYPE_OSPF_EXTERNAL_INFO, ei);
+}
+
+void
+ospf_reset_route_map_set_values (struct route_map_set_values *values)
+{
+  values->metric = -1;
+  values->metric_type = -1;
+}
+
+int
+ospf_route_map_set_compare (struct route_map_set_values *values1,
+			    struct route_map_set_values *values2)
+{
+  return values1->metric == values2->metric &&
+    values1->metric_type == values2->metric_type;
+}
+
+/* Add an External info for AS-external-LSA. */
+struct external_info *
+ospf_external_info_add (u_char type, struct prefix_ipv4 p,
+			unsigned int ifindex, struct in_addr nexthop)
+{
+  struct external_info *new;
+  struct route_node *rn;
+
+  /* Initialize route table. */
+  if (EXTERNAL_INFO (type) == NULL)
+    EXTERNAL_INFO (type) = route_table_init ();
+
+  rn = route_node_get (EXTERNAL_INFO (type), (struct prefix *) &p);
+  /* If old info exists, -- discard new one or overwrite with new one? */
+  if (rn)
+    if (rn->info)
+      {
+	route_unlock_node (rn);
+	zlog_warn ("Redistribute[%s]: %s/%d already exists, discard.",
+		   LOOKUP (ospf_redistributed_proto, type),
+		   inet_ntoa (p.prefix), p.prefixlen);
+	/* XFREE (MTYPE_OSPF_TMP, rn->info); */
+	return rn->info;
+      }
+
+  /* Create new External info instance. */
+  new = ospf_external_info_new (type);
+  new->p = p;
+  new->ifindex = ifindex;
+  new->nexthop = nexthop;
+  new->tag = 0;
+
+  rn->info = new;
+
+  if (IS_DEBUG_OSPF (lsa, LSA_GENERATE))
+    zlog_info ("Redistribute[%s]: %s/%d external info created.",
+	       LOOKUP (ospf_redistributed_proto, type),
+	       inet_ntoa (p.prefix), p.prefixlen);
+  return new;
+}
+
+void
+ospf_external_info_delete (u_char type, struct prefix_ipv4 p)
+{
+  struct route_node *rn;
+
+  rn = route_node_lookup (EXTERNAL_INFO (type), (struct prefix *) &p);
+  if (rn)
+    {
+      ospf_external_info_free (rn->info);
+      rn->info = NULL;
+      route_unlock_node (rn);
+      route_unlock_node (rn);
+    }
+}
+
+struct external_info *
+ospf_external_info_lookup (u_char type, struct prefix_ipv4 *p)
+{
+  struct route_node *rn;
+  rn = route_node_lookup (EXTERNAL_INFO (type), (struct prefix *) p);
+  if (rn)
+    {
+      route_unlock_node (rn);
+      if (rn->info)
+	return rn->info;
+    }
+
+  return NULL;
+}
+
+struct ospf_lsa *
+ospf_external_info_find_lsa (struct prefix_ipv4 *p)
+{
+  struct ospf_lsa *lsa;
+  struct as_external_lsa *al;
+  struct in_addr mask, id;
+
+  lsa = ospf_lsdb_lookup_by_id (ospf_top->lsdb, OSPF_AS_EXTERNAL_LSA,
+			       p->prefix, ospf_top->router_id);
+
+  if (!lsa)
+    return NULL;
+
+  al = (struct as_external_lsa *) lsa->data;
+
+  masklen2ip (p->prefixlen, &mask);
+
+  if (mask.s_addr != al->mask.s_addr)
+    {
+      id.s_addr = p->prefix.s_addr | (~mask.s_addr);
+      lsa = ospf_lsdb_lookup_by_id (ospf_top->lsdb, OSPF_AS_EXTERNAL_LSA,
+				   id, ospf_top->router_id);
+      if (!lsa)
+	return NULL;
+    }
+
+  return lsa;
+}
+
+
+/* Update ASBR status. */
+void
+ospf_asbr_status_update (u_char status)
+{
+  zlog_info ("ASBR[Status:%d]: Update", status);
+
+  /* ASBR on. */
+  if (status)
+    {
+      /* Already ASBR. */
+      if (OSPF_IS_ASBR)
+	{
+	  zlog_info ("ASBR[Status:%d]: Already ASBR", status);
+	  return;
+	}
+      SET_FLAG (ospf_top->flags, OSPF_FLAG_ASBR);
+    }
+  else
+    {
+      /* Already non ASBR. */
+      if (! OSPF_IS_ASBR)
+	{
+	  zlog_info ("ASBR[Status:%d]: Already non ASBR", status);
+	  return;
+	}
+      UNSET_FLAG (ospf_top->flags, OSPF_FLAG_ASBR);
+    }
+
+  /* Transition from/to status ASBR, schedule timer. */
+  ospf_spf_calculate_schedule ();
+  OSPF_TIMER_ON (ospf_top->t_router_lsa_update,
+		 ospf_router_lsa_update_timer, OSPF_LSA_UPDATE_DELAY);
+}
+
+void
+ospf_redistribute_withdraw (u_char type)
+{
+  struct route_node *rn;
+  struct external_info *ei;
+
+  /* Delete external info for specified type. */
+  if (EXTERNAL_INFO (type))
+    for (rn = route_top (EXTERNAL_INFO (type)); rn; rn = route_next (rn))
+      if ((ei = rn->info))
+	if (ospf_external_info_find_lsa (&ei->p))
+	  {
+	    if (is_prefix_default (&ei->p) &&
+		ospf_top->default_originate != DEFAULT_ORIGINATE_NONE)
+	      continue;
+	    ospf_external_lsa_flush (type, &ei->p, ei->ifindex, ei->nexthop);
+	    ospf_external_info_delete (type, ei->p);
+	  }
+}