diff --git a/ospfd/ospf_lsa.h b/ospfd/ospf_lsa.h
index 1caf8047e4..a5397b5fdb 100644
--- a/ospfd/ospf_lsa.h
+++ b/ospfd/ospf_lsa.h
@@ -60,6 +60,7 @@
 /* OSPF LSA header. */
 struct lsa_header {
 	uint16_t ls_age;
+#define DO_NOT_AGE 0x8000
 	uint8_t options;
 	uint8_t type;
 	struct in_addr id;
@@ -233,6 +234,9 @@ enum lsid_status { LSID_AVAILABLE = 0, LSID_CHANGE, LSID_NOT_AVAILABLE };
 	 || (type == OSPF_SUMMARY_LSA) || (type == OSPF_ASBR_SUMMARY_LSA)      \
 	 || (type == OSPF_AS_EXTERNAL_LSA) || (type == OSPF_AS_NSSA_LSA))
 
+#define OSPF_FR_CONFIG(o, a)                                                   \
+	(o->fr_configured || ((a != NULL) ? a->fr_info.configured : 0))
+
 /* Prototypes. */
 /* XXX: Eek, time functions, similar are in lib/thread.c */
 extern struct timeval int2tv(int);
@@ -358,4 +362,24 @@ extern void ospf_check_and_gen_init_seq_lsa(struct ospf_interface *oi,
 extern void ospf_flush_lsa_from_area(struct ospf *ospf, struct in_addr area_id,
 				     int type);
 extern void ospf_maxage_lsa_remover(struct thread *thread);
+extern bool ospf_check_dna_lsa(const struct ospf_lsa *lsa);
+extern void ospf_refresh_area_self_lsas(struct ospf_area *area);
+
+/** @brief Check if the LSA is an indication LSA.
+ *  @param lsa pointer.
+ *  @return true or false based on lsa info.
+ */
+static inline bool ospf_check_indication_lsa(struct ospf_lsa *lsa)
+{
+	struct summary_lsa *sl = NULL;
+
+	if (lsa->data->type == OSPF_ASBR_SUMMARY_LSA) {
+		sl = (struct summary_lsa *)lsa->data;
+		if ((GET_METRIC(sl->metric) == OSPF_LS_INFINITY) &&
+		    !CHECK_FLAG(lsa->data->options, OSPF_OPTION_DC))
+			return true;
+	}
+
+	return false;
+}
 #endif /* _ZEBRA_OSPF_LSA_H */
diff --git a/ospfd/ospf_packet.c b/ospfd/ospf_packet.c
index b22fe5d99b..4680f496e1 100644
--- a/ospfd/ospf_packet.c
+++ b/ospfd/ospf_packet.c
@@ -43,6 +43,7 @@
 #include "ospfd/ospf_network.h"
 #include "ospfd/ospf_interface.h"
 #include "ospfd/ospf_ism.h"
+#include "ospfd/ospf_abr.h"
 #include "ospfd/ospf_asbr.h"
 #include "ospfd/ospf_lsa.h"
 #include "ospfd/ospf_lsdb.h"
@@ -3332,6 +3333,14 @@ static int ospf_make_hello(struct ospf_interface *oi, struct stream *s)
 	else
 		stream_putw(s, 0); /* hello-interval of 0 for fast-hellos */
 
+	/* Check if flood-reduction is enabled,
+	 * if yes set the DC bit in the options.
+	 */
+	if (OSPF_FR_CONFIG(oi->ospf, oi->area))
+		SET_FLAG(OPTIONS(oi), OSPF_OPTION_DC);
+	else if (CHECK_FLAG(OPTIONS(oi), OSPF_OPTION_DC))
+		UNSET_FLAG(OPTIONS(oi), OSPF_OPTION_DC);
+
 	if (IS_DEBUG_OSPF_EVENT)
 		zlog_debug("%s: options: %x, int: %s", __func__, OPTIONS(oi),
 			   IF_NAME(oi));
@@ -3420,6 +3429,8 @@ static int ospf_make_db_desc(struct ospf_interface *oi,
 	options = OPTIONS(oi);
 	if (CHECK_FLAG(oi->ospf->config, OSPF_OPAQUE_CAPABLE))
 		SET_FLAG(options, OSPF_OPTION_O);
+	if (OSPF_FR_CONFIG(oi->ospf, oi->area))
+		SET_FLAG(options, OSPF_OPTION_DC);
 	stream_putc(s, options);
 
 	/* DD flags */
diff --git a/ospfd/ospf_route.c b/ospfd/ospf_route.c
index 6360d8ec60..9b9b61bdb3 100644
--- a/ospfd/ospf_route.c
+++ b/ospfd/ospf_route.c
@@ -986,6 +986,16 @@ void ospf_prune_unreachable_routers(struct route_table *rtrs)
 						&or->u.std.area_id);
 				}
 
+				/* Unset the DNA flag on lsa, if the router
+				 * which generated this lsa is no longer
+				 * reachabele.
+				 */
+				(CHECK_FLAG(or->u.std.origin->ls_age,
+					    DO_NOT_AGE))
+					? UNSET_FLAG(or->u.std.origin->ls_age,
+						     DO_NOT_AGE)
+					: 0;
+
 				listnode_delete(paths, or);
 				ospf_route_free(or);
 			}