diff --git a/proto/ospf/lsack.c b/proto/ospf/lsack.c
index 5870809b..f34f7760 100644
--- a/proto/ospf/lsack.c
+++ b/proto/ospf/lsack.c
@@ -37,3 +37,9 @@ ospf_lsack_rx(struct ospf_lsack_packet *ps, struct proto *p,
   /* FIXME Go on! */
 }
 
+void
+add_ack_list(struct ospf_neighbor *n,struct ospf_lsa_header *lsa)
+{
+  /* FIXME Go on */
+}
+
diff --git a/proto/ospf/lsack.h b/proto/ospf/lsack.h
index ed0ea21d..053e0b51 100644
--- a/proto/ospf/lsack.h
+++ b/proto/ospf/lsack.h
@@ -13,5 +13,6 @@
 void ospf_lsack_tx(struct ospf_neighbor *n);
 void ospf_lsack_rx(struct ospf_lsack_packet *ps, struct proto *p,
   struct ospf_iface *ifa, u16 size);
+void add_ack_list(struct ospf_neighbor *n,struct ospf_lsa_header *lsa);
 
 #endif /* _BIRD_OSPF_LSACK_H_ */
diff --git a/proto/ospf/lsreq.c b/proto/ospf/lsreq.c
index 7fa85be0..f894c66f 100644
--- a/proto/ospf/lsreq.c
+++ b/proto/ospf/lsreq.c
@@ -25,7 +25,7 @@ ospf_lsreq_tx(struct ospf_neighbor *n)
   fill_ospf_pkt_hdr(n->ifa, pk, LSREQ);
 
   sn=SHEAD(n->lsrql);
-  if(sn==NULL)
+  if(EMPTY_SLIST(n->lsrql))
   {
     if(n->state==NEIGHBOR_LOADING) ospf_neigh_sm(n, INM_LOADDONE);
     return;
diff --git a/proto/ospf/lsupd.c b/proto/ospf/lsupd.c
index 5c0d836d..8ff39590 100644
--- a/proto/ospf/lsupd.c
+++ b/proto/ospf/lsupd.c
@@ -87,6 +87,7 @@ ospf_lsupd_rx(struct ospf_lsupd_packet *ps, struct proto *p,
   struct ospf_neighbor *n;
   struct ospf_lsa_header *lsa;
   struct ospf_area *oa;
+  struct proto_ospf *po=(struct proto_ospf *)p;
   u16 length;
   u8 i;
 
@@ -113,7 +114,9 @@ ospf_lsupd_rx(struct ospf_lsupd_packet *ps, struct proto *p,
   for(i=0;i<ntohl(ps->lsano);i++,
     lsa=(struct ospf_lsa_header *)(((u8 *)lsa)+ntohs(lsa->length)))
   {
-    if(lsa->checksum!=lsasum_check(lsa,NULL,(struct proto_ospf *)p))
+    struct ospf_lsa_header lsatmp;
+    struct top_hash_entry *lsadb;
+    if(lsa->checksum!=lsasum_check(lsa,NULL,po))
     {
       log("Received bad lsa checksum from %u\n",n->rid);
       continue;
@@ -128,9 +131,72 @@ ospf_lsupd_rx(struct ospf_lsupd_packet *ps, struct proto *p,
       log("Received External LSA in stub area from %u\n",n->rid);
       continue;
     }
-      /* FIXME Go on */
+    ntohlsah(lsa,&lsatmp);
     DBG("Processing update Type: %u ID: %u RT: %u\n",lsa->type,
         ntohl(lsa->id), ntohl(lsa->rt));
+    lsadb=ospf_hash_find_header(oa->gr, &lsatmp);
+    if((lsatmp.age==LSA_MAXAGE)&&(lsadb==NULL))
+    {
+      struct ospf_neighbor *n=NULL;
+      struct ospf_iface *ifa=NULL;
+      int flag=0;
+
+      WALK_LIST(NODE ifa,po->iface_list)
+        WALK_LIST(NODE n,ifa->neigh_list)
+          if((n->state==NEIGHBOR_EXCHANGE)&&(n->state==NEIGHBOR_LOADING))
+            flag=1;
+
+      if(flag==0)
+      {
+        add_ack_list(n,lsa);
+	continue;
+      }
+    }
+    if((lsadb==NULL)||(lsa_comp(&lsatmp,&lsadb->lsa)==CMP_NEWER))
+    {
+       struct ospf_neighbor *n=NULL;
+       struct ospf_iface *ifa=NULL;
+
+       /* FIXME self originated? */
+
+      if(lsadb && ((lsadb->inst_t-now)<MINLSARRIVAL)) continue;
+
+      /* Remove old from all ret lists */
+      WALK_LIST(NODE ifa,po->iface_list)
+        WALK_LIST(NODE n,ifa->neigh_list)
+	{
+	  struct top_hash_entry *en;
+	  if((en=ospf_hash_find_header(n->lsrth,&lsadb->lsa))!=NULL)
+	    s_rem_node(SNODE en);
+	}
+
+      /* Install new */
+      memcpy(&lsadb->lsa,&lsatmp,sizeof(struct ospf_lsa_header));
+      lsadb->inst_t=now;
+      if(lsadb->lsa_body!=NULL) mb_free(lsadb->lsa_body);
+      lsadb->lsa_body=mb_alloc(p->pool,lsadb->lsa.length-
+        sizeof(struct ospf_lsa_header));
+      ntohlsab(lsa+1,lsadb->lsa_body,lsadb->lsa.type,lsadb->lsa.length);
+
+      /* FIXME lsa_flood(n,lsadb) */
+      /* FIXME ack_lsa() */
+      continue;
+    }
+
+    /* FIXME pg144 (6)?? */
+
+    if(lsa_comp(&lsatmp,&lsadb->lsa)==CMP_SAME)
+    {
+	struct top_hash_entry *en;
+	if((en=ospf_hash_find_header(n->lsrth,&lsadb->lsa))!=NULL)
+	  s_rem_node(SNODE en);
+        /* FIXME ack_lsa() */
+	continue;
+    }
+
+    if((lsadb->lsa.age==LSA_MAXAGE)&&(lsadb->lsa.sn==LSA_MAXSEQNO)) continue;
+
+    /* FIXME lsa_send(n,lsa) */
   }
 }
 
diff --git a/proto/ospf/neighbor.c b/proto/ospf/neighbor.c
index ae415e13..e57143e7 100644
--- a/proto/ospf/neighbor.c
+++ b/proto/ospf/neighbor.c
@@ -210,10 +210,11 @@ ospf_neigh_sm(struct ospf_neighbor *n, int event)
         s_init_list(&(n->lsrql));
 	n->lsrqh=ospf_top_new(n->ifa->proto);
         s_init_list(&(n->lsrtl));
+	n->lsrth=ospf_top_new(n->ifa->proto);
 	s_init(&(n->dbsi), &(n->ifa->oa->lsal));
 	s_init(&(n->lsrqi), &(n->lsrql));
+	s_init(&(n->lsrti), &(n->lsrtl));
 	tm_start(n->lsrr_timer,n->ifa->rxmtint);
-	/*ospf_dbdes_tx(n);*/
       }
       else die("NEGDONE and I'm not in EXSTART?\n");
       break;
@@ -222,6 +223,7 @@ ospf_neigh_sm(struct ospf_neighbor *n, int event)
 	/* FIXME Go on */
       break;
     case INM_LOADDONE:
+        neigh_chstate(n,NEIGHBOR_FULL);
       break;
     case INM_ADJOK:
         switch(n->state)
diff --git a/proto/ospf/ospf.h b/proto/ospf/ospf.h
index ee94f10d..9b653fe1 100644
--- a/proto/ospf/ospf.h
+++ b/proto/ospf/ospf.h
@@ -37,12 +37,12 @@
 #endif
 
 
-#define LSREFRESHTIME 1800	/* 30 minut */
+#define LSREFRESHTIME 1800	/* 30 minutes */
 #define MINLSINTERVAL 5
 #define MINLSARRIVAL 1
 #define MAXAGE 3600		/* 1 hour */
-#define CHECKAGE 300		/* 5 min */
-#define MAXAGEDIFF 900		/* 15 min */
+#define CHECKAGE 300		/* 5 minutes */
+#define MAXAGEDIFF 900		/* 15 minutes */
 #define LSINFINITY 0xffffff
 /*#define DEFAULTDES 0.0.0.0 FIXME: How to define it? */
 #define INITSEQNUM 0x80000001	/* Initial Sequence Number */
@@ -285,6 +285,7 @@ struct ospf_neighbor
   siterator lsrqi;
   slist lsrtl;		/* Link state retransmission list */
   siterator lsrti;
+  struct top_graph *lsrth;
   void *ldbdes;		/* Last database description packet */
   timer *rxmt_timer;	/* RXMT timer */
   timer *lsrr_timer;	/* Link state requiest retransmition timer */
diff --git a/proto/ospf/topology.c b/proto/ospf/topology.c
index e4982c27..e166b4ad 100644
--- a/proto/ospf/topology.c
+++ b/proto/ospf/topology.c
@@ -291,6 +291,11 @@ ospf_top_rehash(struct top_graph *f, int step)
   ospf_top_ht_free(oldt);
 }
 
+struct top_hash_entry *
+ospf_hash_find_header(struct top_graph *f, struct ospf_lsa_header *h)
+{
+  return ospf_hash_find(f,h->id,h->rt,h->type);
+}
 struct top_hash_entry *
 ospf_hash_find(struct top_graph *f, u32 lsa, u32 rtr, u32 type)
 {
diff --git a/proto/ospf/topology.h b/proto/ospf/topology.h
index 9ebd0ed7..d0e9ad9b 100644
--- a/proto/ospf/topology.h
+++ b/proto/ospf/topology.h
@@ -14,6 +14,7 @@ struct top_hash_entry {  /* Index for fast mapping (type,rtrid,LSid)->vertex */
   struct top_hash_entry *next;		/* Next in hash chain */
   struct ospf_lsa_header lsa;
   void *lsa_body;
+  bird_clock_t inst_t;			/* Time of installation into DB */
 };
 
 struct top_graph {
@@ -30,6 +31,7 @@ struct top_graph {
 struct top_graph *ospf_top_new(struct proto_ospf *);
 void ospf_top_free(struct top_graph *);
 void ospf_top_dump(struct top_graph *);
+struct top_hash_entry *ospf_hash_find_header(struct top_graph *f, struct ospf_lsa_header *h);
 struct top_hash_entry *ospf_hash_find(struct top_graph *, u32 lsa, u32 rtr, u32 type);
 struct top_hash_entry *ospf_hash_get(struct top_graph *, u32 lsa, u32 rtr, u32 type);
 void ospf_hash_delete(struct top_graph *, struct top_hash_entry *);