* bgpd.[ch], bgp_vty.c, bgp_route.c: "Restart session after

	  maximum-prefix limit" feature support.

	[merge from GNU Zebra]

5 files changed, 228 insertions, 48 deletions

diff --git a/bgpd/ChangeLog b/bgpd/ChangeLog
index 269c5524..00072cca 100644
--- a/bgpd/ChangeLog
+++ b/bgpd/ChangeLog
@@ -1,5 +1,10 @@
 2005-02-01 Akihiro Mizutani <mizutani@net-chef.net>
 
+	* bgpd.[ch], bgp_vty.c, bgp_route.c: "Restart session after
+	  maximum-prefix limit" feature support.
+
+2005-02-01 Akihiro Mizutani <mizutani@net-chef.net>
+
 	* bgp_nexthop.c: Improve debug.
 	* bgpd.[ch], bgp_nexthop.c, bgp_snmp.c: Remove useless bgp_get_master()
 	  function.
diff --git a/bgpd/bgp_route.c b/bgpd/bgp_route.c
index 40a61b61..2e7f7b31 100644
--- a/bgpd/bgp_route.c
+++ b/bgpd/bgp_route.c
@@ -52,6 +52,7 @@ Software Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA
 #include "bgpd/bgp_damp.h"
 #include "bgpd/bgp_advertise.h"
 #include "bgpd/bgp_zebra.h"
+#include "bgpd/bgp_vty.h"
 
 /* Extern from bgp_dump.c */
 extern char *bgp_origin_str[];
@@ -1267,7 +1268,24 @@ bgp_process (struct bgp *bgp, struct bgp_node *rn, afi_t afi, safi_t safi)
     }
   return 0;
 }
-  
+
+int
+bgp_maximum_prefix_restart_timer (struct thread *thread)
+{
+  struct peer *peer;
+
+  peer = THREAD_ARG (thread);
+  peer->t_pmax_restart = NULL;
+
+  if (BGP_DEBUG (events, EVENTS))
+    zlog_debug ("%s Maximum-prefix restart timer expired, restore peering",
+		peer->host);
+
+  peer_clear (peer);
+
+  return 0;
+}
+
 int
 bgp_maximum_prefix_overflow (struct peer *peer, afi_t afi, 
                              safi_t safi, int always)
@@ -1282,8 +1300,9 @@ bgp_maximum_prefix_overflow (struct peer *peer, afi_t afi,
        return 0;
 
       zlog (peer->log, LOG_INFO,
-           "%%MAXPFXEXCEED: No. of prefix received from %s (afi %d): %ld exceed limit %ld",
-           peer->host, afi, peer->pcount[afi][safi], peer->pmax[afi][safi]);
+	    "%%MAXPFXEXCEED: No. of %s prefix received from %s %ld exceed, "
+	    "limit %ld", afi_safi_print (afi, safi), peer->host,
+	    peer->pcount[afi][safi], peer->pmax[afi][safi]);
       SET_FLAG (peer->af_sflags[afi][safi], PEER_STATUS_PREFIX_LIMIT);
 
       if (CHECK_FLAG (peer->af_flags[afi][safi], PEER_FLAG_MAX_PREFIX_WARNING))
@@ -1307,6 +1326,20 @@ bgp_maximum_prefix_overflow (struct peer *peer, afi_t afi,
        bgp_notify_send_with_data (peer, BGP_NOTIFY_CEASE,
                                   BGP_NOTIFY_CEASE_MAX_PREFIX, ndata, 7);
       }
+
+      /* restart timer start */
+      if (peer->pmax_restart[afi][safi])
+	{
+	  peer->v_pmax_restart = peer->pmax_restart[afi][safi] * 60;
+
+	  if (BGP_DEBUG (events, EVENTS))
+	    zlog_debug ("%s Maximum-prefix restart timer started for %d secs",
+			peer->host, peer->v_pmax_restart);
+
+	  BGP_TIMER_ON (peer->t_pmax_restart, bgp_maximum_prefix_restart_timer,
+			peer->v_pmax_restart);
+	}
+
       return 1;
     }
   else
@@ -1319,8 +1352,9 @@ bgp_maximum_prefix_overflow (struct peer *peer, afi_t afi,
        return 0;
 
       zlog (peer->log, LOG_INFO,
-           "%%MAXPFX: No. of prefix received from %s (afi %d) reaches %ld, max %ld",
-           peer->host, afi, peer->pcount[afi][safi], peer->pmax[afi][safi]);
+	    "%%MAXPFX: No. of %s prefix received from %s reaches %ld, max %ld",
+	    afi_safi_print (afi, safi), peer->host, peer->pcount[afi][safi],
+	    peer->pmax[afi][safi]);
       SET_FLAG (peer->af_sflags[afi][safi], PEER_STATUS_PREFIX_THRESHOLD);
     }
   else
diff --git a/bgpd/bgp_vty.c b/bgpd/bgp_vty.c
index b94e66b0..02f8e4cf 100644
--- a/bgpd/bgp_vty.c
+++ b/bgpd/bgp_vty.c
@@ -3569,12 +3569,14 @@ DEFUN (no_neighbor_unsuppress_map,
 int
 peer_maximum_prefix_set_vty (struct vty *vty, const char *ip_str, afi_t afi,
 			     safi_t safi, const char *num_str,  
-                             const char *threshold_str, int warning)
+			     const char *threshold_str, int warning,
+			     const char *restart_str)
 {
   int ret;
   struct peer *peer;
   u_int32_t max;
   u_char threshold;
+  u_int16_t restart;
 
   peer = peer_and_group_lookup_vty (vty, ip_str);
   if (! peer)
@@ -3586,7 +3588,12 @@ peer_maximum_prefix_set_vty (struct vty *vty, const char *ip_str, afi_t afi,
   else
     threshold = MAXIMUM_PREFIX_THRESHOLD_DEFAULT;
 
-  ret = peer_maximum_prefix_set (peer, afi, safi, max, threshold, warning);
+  if (restart_str)
+    restart = atoi (restart_str);
+  else
+    restart = 0;
+
+  ret = peer_maximum_prefix_set (peer, afi, safi, max, threshold, warning, restart);
 
   return bgp_vty_return (vty, ret);
 }
@@ -3619,7 +3626,8 @@ DEFUN (neighbor_maximum_prefix,
        "maximum no. of prefix limit\n")
 {
   return peer_maximum_prefix_set_vty (vty, argv[0], bgp_node_afi (vty),
-                                     bgp_node_safi (vty), argv[1], NULL, 0);
+				      bgp_node_safi (vty), argv[1], NULL, 0,
+				      NULL);
 }
 
 DEFUN (neighbor_maximum_prefix_threshold,
@@ -3632,8 +3640,9 @@ DEFUN (neighbor_maximum_prefix_threshold,
        "Threshold value (%) at which to generate a warning msg\n")
 {
   return peer_maximum_prefix_set_vty (vty, argv[0], bgp_node_afi (vty),
-                                     bgp_node_safi (vty), argv[1], argv[2], 0);
- }
+				      bgp_node_safi (vty), argv[1], argv[2], 0,
+				      NULL);
+}
 
 DEFUN (neighbor_maximum_prefix_warning,
        neighbor_maximum_prefix_warning_cmd,
@@ -3645,7 +3654,8 @@ DEFUN (neighbor_maximum_prefix_warning,
        "Only give warning message when limit is exceeded\n")
 {
   return peer_maximum_prefix_set_vty (vty, argv[0], bgp_node_afi (vty),
-                                     bgp_node_safi (vty), argv[1], NULL, 1);
+				      bgp_node_safi (vty), argv[1], NULL, 1,
+				      NULL);
 }
 
 DEFUN (neighbor_maximum_prefix_threshold_warning,
@@ -3659,8 +3669,37 @@ DEFUN (neighbor_maximum_prefix_threshold_warning,
        "Only give warning message when limit is exceeded\n")
 {
   return peer_maximum_prefix_set_vty (vty, argv[0], bgp_node_afi (vty),
-                                     bgp_node_safi (vty), argv[1], argv[2], 1);
- }
+				      bgp_node_safi (vty), argv[1], argv[2], 1, NULL);
+}
+
+DEFUN (neighbor_maximum_prefix_restart,
+       neighbor_maximum_prefix_restart_cmd,
+       NEIGHBOR_CMD2 "maximum-prefix <1-4294967295> restart <1-65535>",
+       NEIGHBOR_STR
+       NEIGHBOR_ADDR_STR2
+       "Maximum number of prefix accept from this peer\n"
+       "maximum no. of prefix limit\n"
+       "Restart bgp connection after limit is exceeded\n"
+       "Restart interval in minutes")
+{
+  return peer_maximum_prefix_set_vty (vty, argv[0], bgp_node_afi (vty),
+				      bgp_node_safi (vty), argv[1], NULL, 0, argv[2]);
+}
+
+DEFUN (neighbor_maximum_prefix_threshold_restart,
+       neighbor_maximum_prefix_threshold_restart_cmd,
+       NEIGHBOR_CMD2 "maximum-prefix <1-4294967295> <1-100> restart <1-65535>",
+       NEIGHBOR_STR
+       NEIGHBOR_ADDR_STR2
+       "Maximum number of prefix accept from this peer\n"
+       "maximum no. of prefix limit\n"
+       "Threshold value (%) at which to generate a warning msg\n"
+       "Restart bgp connection after limit is exceeded\n"
+       "Restart interval in minutes")
+{
+  return peer_maximum_prefix_set_vty (vty, argv[0], bgp_node_afi (vty),
+				      bgp_node_safi (vty), argv[1], argv[2], 0, argv[3]);
+}
 
 DEFUN (no_neighbor_maximum_prefix,
        no_neighbor_maximum_prefix_cmd,
@@ -3684,7 +3723,27 @@ ALIAS (no_neighbor_maximum_prefix,
        "maximum no. of prefix limit\n")
 
 ALIAS (no_neighbor_maximum_prefix,
-       no_neighbor_maximum_prefix_val2_cmd,
+       no_neighbor_maximum_prefix_threshold_cmd,
+       NO_NEIGHBOR_CMD2 "maximum-prefix <1-4294967295> warning-only",
+       NO_STR
+       NEIGHBOR_STR
+       NEIGHBOR_ADDR_STR2
+       "Maximum number of prefix accept from this peer\n"
+       "maximum no. of prefix limit\n"
+       "Threshold value (%) at which to generate a warning msg\n")
+
+ALIAS (no_neighbor_maximum_prefix,
+       no_neighbor_maximum_prefix_warning_cmd,
+       NO_NEIGHBOR_CMD2 "maximum-prefix <1-4294967295> warning-only",
+       NO_STR
+       NEIGHBOR_STR
+       NEIGHBOR_ADDR_STR2
+       "Maximum number of prefix accept from this peer\n"
+       "maximum no. of prefix limit\n"
+       "Only give warning message when limit is exceeded\n");
+
+ALIAS (no_neighbor_maximum_prefix,
+       no_neighbor_maximum_prefix_threshold_warning_cmd,
        NO_NEIGHBOR_CMD2 "maximum-prefix <1-4294967295> <1-100> warning-only",
        NO_STR
        NEIGHBOR_STR
@@ -3692,17 +3751,30 @@ ALIAS (no_neighbor_maximum_prefix,
        "Maximum number of prefix accept from this peer\n"
        "maximum no. of prefix limit\n"
        "Threshold value (%) at which to generate a warning msg\n"
-       "Only give warning message when limit is exceeded\n")
+       "Only give warning message when limit is exceeded\n");
 
 ALIAS (no_neighbor_maximum_prefix,
-       no_neighbor_maximum_prefix_val3_cmd,
-       NO_NEIGHBOR_CMD2 "maximum-prefix <1-4294967295> warning-only",
+       no_neighbor_maximum_prefix_restart_cmd,
+       NO_NEIGHBOR_CMD2 "maximum-prefix <1-4294967295> restart <1-65535>",
        NO_STR
        NEIGHBOR_STR
        NEIGHBOR_ADDR_STR2
        "Maximum number of prefix accept from this peer\n"
        "maximum no. of prefix limit\n"
-       "Only give warning message when limit is exceeded\n")
+       "Restart bgp connection after limit is exceeded\n"
+       "Restart interval in minutes")
+
+ALIAS (no_neighbor_maximum_prefix,
+       no_neighbor_maximum_prefix_threshold_restart_cmd,
+       NO_NEIGHBOR_CMD2 "maximum-prefix <1-4294967295> <1-100> restart <1-65535>",
+       NO_STR
+       NEIGHBOR_STR
+       NEIGHBOR_ADDR_STR2
+       "Maximum number of prefix accept from this peer\n"
+       "maximum no. of prefix limit\n"
+       "Threshold value (%) at which to generate a warning msg\n"
+       "Restart bgp connection after limit is exceeded\n"
+       "Restart interval in minutes")
 
 /* "neighbor allowas-in" */
 DEFUN (neighbor_allowas_in,
@@ -6860,11 +6932,14 @@ bgp_show_peer_afi (struct vty *vty, struct peer *p, afi_t afi, safi_t safi)
   /* Maximum prefix */
   if (CHECK_FLAG (p->af_flags[afi][safi], PEER_FLAG_MAX_PREFIX))
     {
-      vty_out (vty, "  maximum limit %ld%s%s", p->pmax[afi][safi],
+      vty_out (vty, "  Maximum prefixes allowed %ld%s%s", p->pmax[afi][safi],
 	       CHECK_FLAG (p->af_flags[afi][safi], PEER_FLAG_MAX_PREFIX_WARNING)
-               ? " (warning-only)" : "", VTY_NEWLINE);
-      vty_out (vty, "  Threshold for warning message %d%%%s", p->pmax_threshold [afi][safi],
-              VTY_NEWLINE);
+	       ? " (warning-only)" : "", VTY_NEWLINE);
+      vty_out (vty, "  Threshold for warning message %d%%",
+	       p->pmax_threshold[afi][safi]);
+      if (p->pmax_restart[afi][safi])
+	vty_out (vty, ", restart interval %d min", p->pmax_restart[afi][safi]);
+      vty_out (vty, "%s", VTY_NEWLINE);
     }
 
   vty_out (vty, "%s", VTY_NEWLINE);
@@ -7092,8 +7167,14 @@ bgp_show_peer (struct vty *vty, struct peer *p)
   if (CHECK_FLAG (p->sflags, PEER_STATUS_PREFIX_OVERFLOW))
     {
       vty_out (vty, "  Peer had exceeded the max. no. of prefixes configured.%s", VTY_NEWLINE);
-      vty_out (vty, "  Reduce the no. of prefix and clear ip bgp %s to restore peering%s",
-	       p->host, VTY_NEWLINE);
+
+      if (p->t_pmax_restart)
+	vty_out (vty, "  Reduce the no. of prefix from %s, will restart in %ld seconds%s",
+		 p->host, thread_timer_remain_second (p->t_pmax_restart),
+		 VTY_NEWLINE);
+      else
+	vty_out (vty, "  Reduce the no. of prefix and clear ip bgp %s to restore peering%s",
+		 p->host, VTY_NEWLINE);
     }
 
   /* EBGP Multihop */
@@ -8923,42 +9004,67 @@ bgp_vty_init ()
   install_element (BGP_NODE, &neighbor_maximum_prefix_threshold_cmd);
   install_element (BGP_NODE, &neighbor_maximum_prefix_warning_cmd);
   install_element (BGP_NODE, &neighbor_maximum_prefix_threshold_warning_cmd);
+  install_element (BGP_NODE, &neighbor_maximum_prefix_restart_cmd);
+  install_element (BGP_NODE, &neighbor_maximum_prefix_threshold_restart_cmd);
   install_element (BGP_NODE, &no_neighbor_maximum_prefix_cmd);
   install_element (BGP_NODE, &no_neighbor_maximum_prefix_val_cmd);
-  install_element (BGP_NODE, &no_neighbor_maximum_prefix_val2_cmd);
-  install_element (BGP_NODE, &no_neighbor_maximum_prefix_val3_cmd);
+  install_element (BGP_NODE, &no_neighbor_maximum_prefix_threshold_cmd);
+  install_element (BGP_NODE, &no_neighbor_maximum_prefix_warning_cmd);
+  install_element (BGP_NODE, &no_neighbor_maximum_prefix_threshold_warning_cmd);
+  install_element (BGP_NODE, &no_neighbor_maximum_prefix_restart_cmd);
+  install_element (BGP_NODE, &no_neighbor_maximum_prefix_threshold_restart_cmd);
   install_element (BGP_IPV4_NODE, &neighbor_maximum_prefix_cmd);
   install_element (BGP_IPV4_NODE, &neighbor_maximum_prefix_threshold_cmd);
   install_element (BGP_IPV4_NODE, &neighbor_maximum_prefix_warning_cmd);
   install_element (BGP_IPV4_NODE, &neighbor_maximum_prefix_threshold_warning_cmd);
+  install_element (BGP_IPV4_NODE, &neighbor_maximum_prefix_restart_cmd);
+  install_element (BGP_IPV4_NODE, &neighbor_maximum_prefix_threshold_restart_cmd);
   install_element (BGP_IPV4_NODE, &no_neighbor_maximum_prefix_cmd);
   install_element (BGP_IPV4_NODE, &no_neighbor_maximum_prefix_val_cmd);
-  install_element (BGP_IPV4_NODE, &no_neighbor_maximum_prefix_val2_cmd);
-  install_element (BGP_IPV4_NODE, &no_neighbor_maximum_prefix_val3_cmd);
+  install_element (BGP_IPV4_NODE, &no_neighbor_maximum_prefix_threshold_cmd);
+  install_element (BGP_IPV4_NODE, &no_neighbor_maximum_prefix_warning_cmd);
+  install_element (BGP_IPV4_NODE, &no_neighbor_maximum_prefix_threshold_warning_cmd);
+  install_element (BGP_IPV4_NODE, &no_neighbor_maximum_prefix_restart_cmd);
+  install_element (BGP_IPV4_NODE, &no_neighbor_maximum_prefix_threshold_restart_cmd);
   install_element (BGP_IPV4M_NODE, &neighbor_maximum_prefix_cmd);
   install_element (BGP_IPV4M_NODE, &neighbor_maximum_prefix_threshold_cmd);
   install_element (BGP_IPV4M_NODE, &neighbor_maximum_prefix_warning_cmd);
   install_element (BGP_IPV4M_NODE, &neighbor_maximum_prefix_threshold_warning_cmd);
+  install_element (BGP_IPV4M_NODE, &neighbor_maximum_prefix_restart_cmd);
+  install_element (BGP_IPV4M_NODE, &neighbor_maximum_prefix_threshold_restart_cmd);
   install_element (BGP_IPV4M_NODE, &no_neighbor_maximum_prefix_cmd);
   install_element (BGP_IPV4M_NODE, &no_neighbor_maximum_prefix_val_cmd);
-  install_element (BGP_IPV4M_NODE, &no_neighbor_maximum_prefix_val2_cmd);
-  install_element (BGP_IPV4M_NODE, &no_neighbor_maximum_prefix_val3_cmd);
+  install_element (BGP_IPV4M_NODE, &no_neighbor_maximum_prefix_threshold_cmd);
+  install_element (BGP_IPV4M_NODE, &no_neighbor_maximum_prefix_warning_cmd);
+  install_element (BGP_IPV4M_NODE, &no_neighbor_maximum_prefix_threshold_warning_cmd);
+  install_element (BGP_IPV4M_NODE, &no_neighbor_maximum_prefix_restart_cmd);
+  install_element (BGP_IPV4M_NODE, &no_neighbor_maximum_prefix_threshold_restart_cmd);
   install_element (BGP_IPV6_NODE, &neighbor_maximum_prefix_cmd);
   install_element (BGP_IPV6_NODE, &neighbor_maximum_prefix_threshold_cmd);
   install_element (BGP_IPV6_NODE, &neighbor_maximum_prefix_warning_cmd);
   install_element (BGP_IPV6_NODE, &neighbor_maximum_prefix_threshold_warning_cmd);
+  install_element (BGP_IPV6_NODE, &neighbor_maximum_prefix_restart_cmd);
+  install_element (BGP_IPV6_NODE, &neighbor_maximum_prefix_threshold_restart_cmd);
   install_element (BGP_IPV6_NODE, &no_neighbor_maximum_prefix_cmd);
   install_element (BGP_IPV6_NODE, &no_neighbor_maximum_prefix_val_cmd);
-  install_element (BGP_IPV6_NODE, &no_neighbor_maximum_prefix_val2_cmd);
-  install_element (BGP_IPV6_NODE, &no_neighbor_maximum_prefix_val3_cmd);
+  install_element (BGP_IPV6_NODE, &no_neighbor_maximum_prefix_threshold_cmd);
+  install_element (BGP_IPV6_NODE, &no_neighbor_maximum_prefix_warning_cmd);
+  install_element (BGP_IPV6_NODE, &no_neighbor_maximum_prefix_threshold_warning_cmd);
+  install_element (BGP_IPV6_NODE, &no_neighbor_maximum_prefix_restart_cmd);
+  install_element (BGP_IPV6_NODE, &no_neighbor_maximum_prefix_threshold_restart_cmd);
   install_element (BGP_VPNV4_NODE, &neighbor_maximum_prefix_cmd);
   install_element (BGP_VPNV4_NODE, &neighbor_maximum_prefix_threshold_cmd);
   install_element (BGP_VPNV4_NODE, &neighbor_maximum_prefix_warning_cmd);
   install_element (BGP_VPNV4_NODE, &neighbor_maximum_prefix_threshold_warning_cmd);
+  install_element (BGP_VPNV4_NODE, &neighbor_maximum_prefix_restart_cmd);
+  install_element (BGP_VPNV4_NODE, &neighbor_maximum_prefix_threshold_restart_cmd);
   install_element (BGP_VPNV4_NODE, &no_neighbor_maximum_prefix_cmd);
   install_element (BGP_VPNV4_NODE, &no_neighbor_maximum_prefix_val_cmd);
-  install_element (BGP_VPNV4_NODE, &no_neighbor_maximum_prefix_val2_cmd);
-  install_element (BGP_VPNV4_NODE, &no_neighbor_maximum_prefix_val3_cmd);
+  install_element (BGP_VPNV4_NODE, &no_neighbor_maximum_prefix_threshold_cmd);
+  install_element (BGP_VPNV4_NODE, &no_neighbor_maximum_prefix_warning_cmd);
+  install_element (BGP_VPNV4_NODE, &no_neighbor_maximum_prefix_threshold_warning_cmd);
+  install_element (BGP_VPNV4_NODE, &no_neighbor_maximum_prefix_restart_cmd);
+  install_element (BGP_VPNV4_NODE, &no_neighbor_maximum_prefix_threshold_restart_cmd);
 
   /* "neighbor allowas-in" */
   install_element (BGP_NODE, &neighbor_allowas_in_cmd);
diff --git a/bgpd/bgpd.c b/bgpd/bgpd.c
index cb760d90..097b235c 100644
--- a/bgpd/bgpd.c
+++ b/bgpd/bgpd.c
@@ -1075,6 +1075,7 @@ peer_delete (struct peer *peer)
   BGP_TIMER_OFF (peer->t_keepalive);
   BGP_TIMER_OFF (peer->t_asorig);
   BGP_TIMER_OFF (peer->t_routeadv);
+  BGP_TIMER_OFF (peer->t_pmax_restart);
 
   /* Delete from all peer list. */
   if (! CHECK_FLAG (peer->sflags, PEER_STATUS_GROUP))
@@ -1296,6 +1297,7 @@ peer_group2peer_config_copy (struct peer_group *group, struct peer *peer,
   /* maximum-prefix */
   peer->pmax[afi][safi] = conf->pmax[afi][safi];
   peer->pmax_threshold[afi][safi] = conf->pmax_threshold[afi][safi];
+  peer->pmax_restart[afi][safi] = conf->pmax_restart[afi][safi];
 
   /* allowas-in */
   peer->allowas_in[afi][safi] = conf->allowas_in[afi][safi];
@@ -2148,6 +2150,15 @@ peer_flag_modify_action (struct peer *peer, u_int32_t flag)
     {
       if (CHECK_FLAG (peer->flags, flag))
 	{
+	  UNSET_FLAG (peer->sflags, PEER_STATUS_PREFIX_OVERFLOW);
+	  if (peer->t_pmax_restart)
+	    {
+	      BGP_TIMER_OFF (peer->t_pmax_restart);
+              if (BGP_DEBUG (events, EVENTS))
+		zlog_debug ("%s Maximum-prefix restart timer canceled",
+			    peer->host);
+	    }
+
 	  if (peer->status == Established)
 	    bgp_notify_send (peer, BGP_NOTIFY_CEASE,
 			     BGP_NOTIFY_CEASE_ADMIN_SHUTDOWN);
@@ -3923,7 +3934,8 @@ peer_unsuppress_map_unset (struct peer *peer, afi_t afi, safi_t safi)
 
 int
 peer_maximum_prefix_set (struct peer *peer, afi_t afi, safi_t safi,
-			 u_int32_t max, u_char threshold, int warning)
+			 u_int32_t max, u_char threshold,
+			 int warning, u_int16_t restart)
 {
   struct peer_group *group;
   struct listnode *nn;
@@ -3934,6 +3946,7 @@ peer_maximum_prefix_set (struct peer *peer, afi_t afi, safi_t safi,
   SET_FLAG (peer->af_flags[afi][safi], PEER_FLAG_MAX_PREFIX);
   peer->pmax[afi][safi] = max;
   peer->pmax_threshold[afi][safi] = threshold;
+  peer->pmax_restart[afi][safi] = restart;
   if (warning)
     SET_FLAG (peer->af_flags[afi][safi], PEER_FLAG_MAX_PREFIX_WARNING);
   else
@@ -3951,6 +3964,7 @@ peer_maximum_prefix_set (struct peer *peer, afi_t afi, safi_t safi,
       SET_FLAG (peer->af_flags[afi][safi], PEER_FLAG_MAX_PREFIX);
       peer->pmax[afi][safi] = max;
       peer->pmax_threshold[afi][safi] = threshold;
+      peer->pmax_restart[afi][safi] = restart;
       if (warning)
 	SET_FLAG (peer->af_flags[afi][safi], PEER_FLAG_MAX_PREFIX_WARNING);
       else
@@ -3985,13 +3999,15 @@ peer_maximum_prefix_unset (struct peer *peer, afi_t afi, safi_t safi)
 
       peer->pmax[afi][safi] = peer->group->conf->pmax[afi][safi];
       peer->pmax_threshold[afi][safi] = peer->group->conf->pmax_threshold[afi][safi];
+      peer->pmax_restart[afi][safi] = peer->group->conf->pmax_restart[afi][safi];
       return 0;
     }
 
   UNSET_FLAG (peer->af_flags[afi][safi], PEER_FLAG_MAX_PREFIX);
   UNSET_FLAG (peer->af_flags[afi][safi], PEER_FLAG_MAX_PREFIX_WARNING);
   peer->pmax[afi][safi] = 0;
-  peer->pmax_threshold[afi][safi] = MAXIMUM_PREFIX_THRESHOLD_DEFAULT;
+  peer->pmax_threshold[afi][safi] = 0;
+  peer->pmax_restart[afi][safi] = 0;
 
   if (! CHECK_FLAG (peer->sflags, PEER_STATUS_GROUP))
     return 0;
@@ -4005,7 +4021,8 @@ peer_maximum_prefix_unset (struct peer *peer, afi_t afi, safi_t safi)
       UNSET_FLAG (peer->af_flags[afi][safi], PEER_FLAG_MAX_PREFIX);
       UNSET_FLAG (peer->af_flags[afi][safi], PEER_FLAG_MAX_PREFIX_WARNING);
       peer->pmax[afi][safi] = 0;
-      peer->pmax_threshold[afi][safi] = MAXIMUM_PREFIX_THRESHOLD_DEFAULT;
+      peer->pmax_threshold[afi][safi] = 0;
+      peer->pmax_restart[afi][safi] = 0;
     }
   return 0;
 }
@@ -4015,7 +4032,20 @@ peer_clear (struct peer *peer)
 {
   if (! CHECK_FLAG (peer->flags, PEER_FLAG_SHUTDOWN))
     {
-      UNSET_FLAG (peer->sflags, PEER_STATUS_PREFIX_OVERFLOW);
+      if (CHECK_FLAG (peer->sflags, PEER_STATUS_PREFIX_OVERFLOW))
+	{
+	  UNSET_FLAG (peer->sflags, PEER_STATUS_PREFIX_OVERFLOW);
+	  if (peer->t_pmax_restart)
+	    {
+	      BGP_TIMER_OFF (peer->t_pmax_restart);
+	      if (BGP_DEBUG (events, EVENTS))
+		zlog_debug ("%s Maximum-prefix restart timer canceled",
+			    peer->host);
+	    }
+	  BGP_EVENT_ADD (peer, BGP_Start);
+	  return 0;
+	}
+
       peer->v_start = BGP_INIT_START_TIMER;
       if (peer->status == Established)
 	bgp_notify_send (peer, BGP_NOTIFY_CEASE,
@@ -4499,12 +4529,14 @@ bgp_config_write_peer (struct vty *vty, struct bgp *bgp,
 	|| CHECK_FLAG (g_peer->af_flags[afi][safi], PEER_FLAG_MAX_PREFIX_WARNING)
 	   != CHECK_FLAG (peer->af_flags[afi][safi], PEER_FLAG_MAX_PREFIX_WARNING))
       {
-       vty_out (vty, " neighbor %s maximum-prefix %ld", addr, peer->pmax[afi][safi]);
-       if (peer->pmax_threshold[afi][safi] != MAXIMUM_PREFIX_THRESHOLD_DEFAULT)
-         vty_out (vty, " %d", peer->pmax_threshold[afi][safi]);
-       if (CHECK_FLAG (peer->af_flags[afi][safi], PEER_FLAG_MAX_PREFIX_WARNING))
-         vty_out (vty, " warning-only");
-       vty_out (vty, "%s", VTY_NEWLINE);
+	vty_out (vty, " neighbor %s maximum-prefix %ld", addr, peer->pmax[afi][safi]);
+	if (peer->pmax_threshold[afi][safi] != MAXIMUM_PREFIX_THRESHOLD_DEFAULT)
+	  vty_out (vty, " %d", peer->pmax_threshold[afi][safi]);
+	if (CHECK_FLAG (peer->af_flags[afi][safi], PEER_FLAG_MAX_PREFIX_WARNING))
+	  vty_out (vty, " warning-only");
+	if (peer->pmax_restart[afi][safi])
+	  vty_out (vty, " restart %d", peer->pmax_restart[afi][safi]);
+	vty_out (vty, "%s", VTY_NEWLINE);
       }
 
   /* Route server client. */
diff --git a/bgpd/bgpd.h b/bgpd/bgpd.h
index 42c3ceaa..7a0707c0 100644
--- a/bgpd/bgpd.h
+++ b/bgpd/bgpd.h
@@ -301,7 +301,7 @@ struct peer
   u_char afc_adv[AFI_MAX][SAFI_MAX];
   u_char afc_recv[AFI_MAX][SAFI_MAX];
 
-  /* Capability Flags.*/
+  /* Capability flags (reset in bgp_stop) */
   u_char cap;
 #define PEER_CAP_REFRESH_ADV                (1 << 0) /* refresh advertised */
 #define PEER_CAP_REFRESH_OLD_RCV            (1 << 1) /* refresh old received */
@@ -311,7 +311,7 @@ struct peer
 #define PEER_CAP_RESTART_ADV                (1 << 5) /* restart advertised */
 #define PEER_CAP_RESTART_RCV                (1 << 6) /* restart received */
 
-  /* Capability Flags.*/
+  /* Capability flags (reset in bgp_stop) */
   u_int16_t af_cap[AFI_MAX][SAFI_MAX];
 #define PEER_CAP_ORF_PREFIX_SM_ADV          (1 << 0) /* send-mode advertised */
 #define PEER_CAP_ORF_PREFIX_RM_ADV          (1 << 1) /* receive-mode advertised */
@@ -371,7 +371,7 @@ struct peer
 #define PEER_STATUS_HAVE_ACCEPT       (1 << 3) /* accept peer's parent */
 #define PEER_STATUS_GROUP             (1 << 4) /* peer-group conf */
 
-  /* Peer status af flags. */
+  /* Peer status af flags (reset in bgp_stop) */
   u_int16_t af_sflags[AFI_MAX][SAFI_MAX];
 #define PEER_STATUS_ORF_PREFIX_SEND   (1 << 0) /* prefix-list send peer */
 #define PEER_STATUS_ORF_WAIT_REFRESH  (1 << 1) /* wait refresh received peer */
@@ -399,6 +399,7 @@ struct peer
   u_int32_t v_keepalive;
   u_int32_t v_asorig;
   u_int32_t v_routeadv;
+  u_int32_t v_pmax_restart;
 
   /* Threads. */
   struct thread *t_read;
@@ -409,6 +410,7 @@ struct peer
   struct thread *t_keepalive;
   struct thread *t_asorig;
   struct thread *t_routeadv;
+  struct thread *t_pmax_restart;
 
   /* Statistics field */
   u_int32_t open_in;		/* Open message input count */
@@ -457,6 +459,7 @@ struct peer
   /* Max prefix count. */
   unsigned long pmax[AFI_MAX][SAFI_MAX];
   u_char pmax_threshold[AFI_MAX][SAFI_MAX];
+  u_int16_t pmax_restart[AFI_MAX][SAFI_MAX];
 #define MAXIMUM_PREFIX_THRESHOLD_DEFAULT 75
 
   /* allowas-in. */
@@ -891,7 +894,7 @@ int peer_route_map_unset (struct peer *, afi_t, safi_t, int);
 int peer_unsuppress_map_set (struct peer *, afi_t, safi_t, const char *);
 int peer_unsuppress_map_unset (struct peer *, afi_t, safi_t);
 
-int peer_maximum_prefix_set (struct peer *, afi_t, safi_t, u_int32_t, u_char, int);
+int peer_maximum_prefix_set (struct peer *, afi_t, safi_t, u_int32_t, u_char, int, u_int16_t);
 int peer_maximum_prefix_unset (struct peer *, afi_t, safi_t);
 
 int peer_clear (struct peer *);