Initial revision
diff --git a/ospf6d/ospf6_damp.c b/ospf6d/ospf6_damp.c
new file mode 100644
index 0000000..4e807a7
--- /dev/null
+++ b/ospf6d/ospf6_damp.c
@@ -0,0 +1,748 @@
+/*
+ * OSPF flap dampening by Manav Bhatia
+ * Copyright (C) 2002
+ *
+ * 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 <math.h>
+
+#include "log.h"
+#include "prefix.h"
+#include "thread.h"
+#include "table.h"
+#include "command.h"
+#include "vty.h"
+
+extern struct thread_master *master;
+
+#include "ospf6_damp.h"
+
+#ifdef HAVE_OSPF6_DAMP
+
+#define DELTA_REUSE 10 /* Time granularity for reuse lists */
+#define DELTA_T 5 /* Time granularity for decay arrays */
+#define DEFAULT_HALF_LIFE 60 /* (sec) 1 min */
+
+#define DEFAULT_PENALTY 1000
+#define DEFAULT_REUSE 750
+#define DEFAULT_SUPPRESS 2000
+
+#define REUSE_LIST_SIZE 256
+#define REUSE_ARRAY_SIZE 1024
+
+/* Global variable to access damping configuration */
+struct ospf6_damp_config damp_config;
+struct ospf6_damp_config *dc = &damp_config;
+u_int reuse_array_offset = 0;
+struct route_table *damp_info_table[OSPF6_DAMP_TYPE_MAX];
+struct thread *ospf6_reuse_thread = NULL;
+
+int ospf6_damp_debug = 0;
+#define IS_OSPF6_DEBUG_DAMP (ospf6_damp_debug)
+
+static struct ospf6_damp_info *
+ospf6_damp_lookup (u_short type, struct prefix *name)
+{
+ struct route_node *node;
+
+ node = route_node_lookup (damp_info_table[type], name);
+ if (node && node->info)
+ return (struct ospf6_damp_info *) node->info;
+ return NULL;
+}
+
+static struct ospf6_damp_info *
+ospf6_damp_create (u_short type, struct prefix *name)
+{
+ struct route_node *node;
+ struct ospf6_damp_info *di;
+ char namebuf[64];
+
+ di = ospf6_damp_lookup (type, name);
+ if (di)
+ return di;
+
+ if (IS_OSPF6_DEBUG_DAMP)
+ {
+ prefix2str (name, namebuf, sizeof (namebuf));
+ zlog_info ("DAMP: create: type: %d, name: %s", type, namebuf);
+ }
+
+ di = (struct ospf6_damp_info *)
+ malloc (sizeof (struct ospf6_damp_info));
+ memset (di, 0, sizeof (struct ospf6_damp_info));
+ di->type = type;
+ prefix_copy (&di->name, name);
+
+ node = route_node_get (damp_info_table[type], name);
+ node->info = di;
+
+ return di;
+}
+
+static void
+ospf6_damp_delete (u_short type, struct prefix *name)
+{
+ struct route_node *node;
+ struct ospf6_damp_info *di;
+ char namebuf[64];
+
+ node = route_node_lookup (damp_info_table[type], name);
+ if (! node || ! node->info)
+ return;
+
+ di = node->info;
+
+ if (IS_OSPF6_DEBUG_DAMP)
+ {
+ prefix2str (&di->name, namebuf, sizeof (namebuf));
+ zlog_info ("DAMP: delete: type: %d, name: %s",
+ di->type, namebuf);
+ }
+
+ node->info = NULL;
+ free (di);
+}
+
+/* compute and fill the configuration parameter */
+void
+ospf6_damp_init_config (u_int half_life, u_int reuse,
+ u_int suppress, u_int t_hold)
+{
+ int i;
+ double max_ratio, max_ratio1, max_ratio2;
+
+ dc->half_life = half_life ? half_life : DEFAULT_HALF_LIFE;
+ dc->reuse = reuse ? reuse : DEFAULT_REUSE;
+ dc->suppress = suppress ? suppress : DEFAULT_SUPPRESS;
+ dc->t_hold = t_hold ? t_hold : 4 * dc->half_life;
+
+ /* Initialize system-wide params */
+ dc->delta_t = DELTA_T;
+ dc->delta_reuse = DELTA_REUSE;
+ dc->default_penalty = DEFAULT_PENALTY;
+ dc->reuse_index_array_size = REUSE_ARRAY_SIZE;
+
+ /* ceiling is the maximum penalty a route may attain */
+ /* ceiling = reuse * 2^(T-hold/half-life) */
+ dc->ceiling = (int)
+ (dc->reuse * (pow (2, (double) dc->t_hold / dc->half_life)));
+
+ /* Decay-array computations */
+ /* decay_array_size = decay memory/time granularity */
+ dc->decay_array_size = ceil ((double) dc->t_hold / dc->delta_t);
+ dc->decay_array = malloc (sizeof (double) * (dc->decay_array_size));
+
+ /* Each i-th element is per tick delay raised to the i-th power */
+ dc->decay_array[0] = 1.0;
+ dc->decay_array[1] = exp ((1.0 / (dc->half_life / dc->delta_t)) * log (0.5));
+ for (i = 2; i < dc->decay_array_size; i++)
+ dc->decay_array[i] = dc->decay_array[i - 1] * dc->decay_array[1];
+
+ /* Reuse-list computations (reuse queue head array ?) */
+ dc->reuse_list_size = ceil ((double) dc->t_hold / dc->delta_reuse) + 1;
+ if (dc->reuse_list_size == 0 || dc->reuse_list_size > REUSE_LIST_SIZE)
+ dc->reuse_list_size = REUSE_LIST_SIZE;
+ dc->reuse_list_array = (struct ospf6_damp_info **)
+ malloc (dc->reuse_list_size * sizeof (struct ospf6_reuse_list *));
+ memset (dc->reuse_list_array, 0x00,
+ dc->reuse_list_size * sizeof (struct ospf6_reuse_list *));
+
+ /* Reuse-array computations */
+ dc->reuse_index_array = malloc (sizeof (int) * dc->reuse_index_array_size);
+
+ /*
+ * This is the maximum ratio between the current value of the penalty and
+ * the reuse value which can be indexed by the reuse array. It will be
+ * limited by the ceiling or by the amount of time that the reuse list
+ * covers
+ */
+ max_ratio1 = (double) dc->ceiling / dc->reuse;
+ max_ratio2 = exp ((double) dc->t_hold / dc->half_life) * log10 (2.0);
+ max_ratio = (max_ratio2 != 0 && max_ratio2 < max_ratio1 ?
+ max_ratio2 : max_ratio1);
+
+ /*
+ * reuse array is just an estimator and we need something
+ * to use the full array
+ */
+ dc->scale_factor = (double) dc->reuse_index_array_size / (max_ratio - 1);
+
+ for (i = 0; i < dc->reuse_index_array_size; i++)
+ {
+ dc->reuse_index_array[i] = (int)
+ (((double) dc->half_life / dc->delta_reuse) *
+ log10 (1.0 / (dc->reuse * (1.0 + ((double) i / dc->scale_factor))))
+ / log10 (0.5));
+ }
+
+ dc->enabled = ON;
+}
+
+static double
+ospf6_damp_decay (time_t tdiff)
+{
+ int index = tdiff / dc->delta_t;
+
+ if (index >= dc->decay_array_size)
+ return 0;
+
+ return dc->decay_array[index];
+}
+
+static int
+ospf6_damp_reuse_index (int penalty)
+{
+ int index;
+
+ index = (int) (((double) penalty / dc->reuse - 1.0) * dc->scale_factor);
+
+ if (index >= dc->reuse_index_array_size)
+ index = dc->reuse_index_array_size - 1;
+
+ return (dc->reuse_index_array[index] - dc->reuse_index_array[0]);
+}
+
+static int
+ospf6_reuse_list_lookup (struct ospf6_damp_info *di)
+{
+ struct ospf6_damp_info *info;
+
+ for (info = dc->reuse_list_array[di->index]; info; info = info->next)
+ {
+ if (info == di)
+ return 1;
+ }
+ return 0;
+}
+
+static void
+ospf6_reuse_list_remove (struct ospf6_damp_info *di)
+{
+ if (di->prev)
+ di->prev->next = di->next;
+ else
+ dc->reuse_list_array[di->index] = di->next;
+ if (di->next)
+ di->next->prev = di->prev;
+
+ di->index = -1;
+ di->prev = NULL;
+ di->next = NULL;
+}
+
+static void
+ospf6_reuse_list_add (struct ospf6_damp_info *di)
+{
+ /* set the index of reuse-array */
+ di->index = (reuse_array_offset + (ospf6_damp_reuse_index (di->penalty)))
+ % dc->reuse_list_size;
+
+ /* insert to the head of the reuse list */
+ di->next = dc->reuse_list_array[di->index];
+ if (di->next)
+ di->next->prev = di;
+ di->prev = NULL;
+ dc->reuse_list_array[di->index] = di;
+}
+
+/* When we quit damping for a target, we should execute proper event
+ which have been postponed during damping */
+static void
+ospf6_damp_stop (struct ospf6_damp_info *di)
+{
+ time_t t_now;
+ char namebuf[64];
+ struct timeval now;
+
+ if (IS_OSPF6_DEBUG_DAMP)
+ {
+ t_now = time (NULL);
+ prefix2str (&di->name, namebuf, sizeof (namebuf));
+ gettimeofday (&now, NULL);
+ zlog_info ("DAMP: %lu.%06lu stop damping: %ld: type: %d, name: %s",
+ now.tv_sec, now.tv_usec,
+ t_now, di->type, namebuf);
+ }
+
+ /* set flag indicates that we're damping this target */
+ di->damping = OFF;
+
+ /* if the target's current status differ from that it should be,
+ execute the proper event to repair his status */
+ if (di->target_status != di->event_type)
+ {
+ (*(di->event)) (di->target);
+ di->target_status = di->event_type;
+
+ di->event = NULL;
+ di->event_type = event_none;
+ }
+}
+
+/* ospf6_reuse_timer is called every DELTA_REUSE seconds.
+ Each route in the current reuse-list is evaluated
+ and is used or requeued */
+int
+ospf6_damp_reuse_timer (struct thread *t)
+{
+ struct ospf6_damp_info *di, *next;
+ time_t t_now, t_diff;
+ char namebuf[64];
+ struct timeval now;
+
+ /* Restart the reuse timer */
+ ospf6_reuse_thread =
+ thread_add_timer (master, ospf6_damp_reuse_timer, NULL, dc->delta_reuse);
+
+ t_now = time (NULL);
+
+ /* get the damp info list head */
+ di = dc->reuse_list_array[reuse_array_offset];
+ dc->reuse_list_array[reuse_array_offset] = NULL;
+
+ /* rotate the circular reuse list head array */
+ reuse_array_offset = (reuse_array_offset + 1) % dc->reuse_list_size;
+
+ /* for each damp info */
+ while (di)
+ {
+ next = di->next;
+ di->next = NULL;
+
+ /* Update penalty */
+ t_diff = t_now - di->t_updated;
+ di->t_updated = t_now;
+ di->penalty = (int)
+ ((double) di->penalty * ospf6_damp_decay (t_diff));
+ /* configration of ceiling may be just changed */
+ if (di->penalty > dc->ceiling)
+ di->penalty = dc->ceiling;
+
+ if (IS_OSPF6_DEBUG_DAMP)
+ {
+ prefix2str (&di->name, namebuf, sizeof (namebuf));
+ gettimeofday (&now, NULL);
+ zlog_info ("DAMP: %lu.%06lu update penalty: type: %d, name: %s, penalty: %d",
+ now.tv_sec, now.tv_usec,
+ di->type, namebuf, di->penalty);
+ }
+
+ /* If the penalty becomes under reuse,
+ call real event that we have been postponed. */
+ if (di->penalty < dc->reuse && di->damping == ON)
+ ospf6_damp_stop (di);
+
+ /* If the penalty becomes less than the half of the
+ reuse value, this damp info will be freed from reuse-list,
+ by assuming that it is considered to be stable enough already,
+ and there's no need to maintain flapping history for this. */
+ if (di->penalty <= dc->reuse / 2)
+ {
+ ospf6_damp_delete (di->type, &di->name);
+ di = next;
+ continue;
+ }
+
+ /* re-insert to the reuse-list */
+ ospf6_reuse_list_add (di);
+
+ di = next;
+ }
+
+ return 0;
+}
+
+static void
+ospf6_damp_event (damp_event_t event_type,
+ u_short type, struct prefix *name,
+ int (*event) (void *), void *target)
+{
+ time_t t_now, t_diff;
+ struct ospf6_damp_info *di;
+ char namebuf[64];
+ struct timeval now;
+
+ if (dc->enabled == OFF)
+ {
+ (*event) (target);
+ return;
+ }
+
+ di = ospf6_damp_lookup (type, name);
+ if (! di)
+ di = ospf6_damp_create (type, name);
+
+ t_now = time (NULL);
+
+ di->event = event;
+ di->target = target;
+ di->event_type = event_type;
+
+ if (! ospf6_reuse_list_lookup (di))
+ di->t_start = t_now;
+ else
+ {
+ ospf6_reuse_list_remove (di);
+
+ t_diff = t_now - di->t_updated;
+ di->penalty = (int) (di->penalty * ospf6_damp_decay (t_diff));
+ }
+
+ /* penalty only on down event */
+ if (event_type == event_down)
+ {
+ di->flap++;
+ di->penalty += dc->default_penalty;
+ }
+
+ /* limit penalty up to ceiling */
+ if (di->penalty > dc->ceiling)
+ di->penalty = dc->ceiling;
+
+ if (IS_OSPF6_DEBUG_DAMP)
+ {
+ prefix2str (&di->name, namebuf, sizeof (namebuf));
+ gettimeofday (&now, NULL);
+ zlog_info ("DAMP: %lu.%06lu update penalty: type: %d, name: %s, penalty: %d",
+ now.tv_sec, now.tv_usec,
+ di->type, namebuf, di->penalty);
+ }
+
+ /* if penalty < reuse, stop damping here */
+ if (di->penalty < dc->reuse && di->damping == ON)
+ {
+ if (IS_OSPF6_DEBUG_DAMP)
+ {
+ prefix2str (&di->name, namebuf, sizeof (namebuf));
+ gettimeofday (&now, NULL);
+ zlog_info ("DAMP: %lu.%06lu stop damping: %ld: type: %d, name: %s",
+ now.tv_sec, now.tv_usec,
+ t_now, di->type, namebuf);
+ }
+ di->damping = OFF;
+ }
+
+ /* if event == up and if penalty >= suppress , start damping here */
+ if (di->event_type == event_up && di->penalty >= dc->suppress &&
+ di->damping == OFF)
+ {
+ if (IS_OSPF6_DEBUG_DAMP)
+ {
+ prefix2str (&di->name, namebuf, sizeof (namebuf));
+ gettimeofday (&now, NULL);
+ zlog_info ("DAMP: %lu.%06lu start damping: %ld: type: %d, name: %s",
+ now.tv_sec, now.tv_usec,
+ t_now, type, namebuf);
+ }
+ di->damping = ON;
+ }
+
+ /* execute event if we're not damping */
+ if (di->damping == OFF)
+ {
+ (*(di->event)) (di->target);
+ di->target_status = di->event_type;
+ }
+
+ /* if the penalty goes beyond suppress value, start damping */
+ if (di->penalty >= dc->suppress && di->damping == OFF)
+ {
+ if (IS_OSPF6_DEBUG_DAMP)
+ {
+ prefix2str (name, namebuf, sizeof (namebuf));
+ gettimeofday (&now, NULL);
+ zlog_info ("DAMP: %lu.%06lu start damping: %ld: type: %d, name: %s",
+ now.tv_sec, now.tv_usec,
+ t_now, type, namebuf);
+ }
+ di->damping = ON;
+ }
+
+ /* update last-updated-time field */
+ di->t_updated = t_now;
+
+ /* Insert it into the reuse list */
+ ospf6_reuse_list_add (di);
+}
+
+void
+ospf6_damp_event_up (u_short type, struct prefix *name,
+ int (*event) (void *), void *target)
+{
+ struct timeval now;
+
+ gettimeofday (&now, NULL);
+ if (IS_OSPF6_DEBUG_DAMP)
+ zlog_info ("DAMP: Up Event at %lu.%06lu", now.tv_sec, now.tv_usec);
+
+ ospf6_damp_event (event_up, type, name, event, target);
+}
+
+void
+ospf6_damp_event_down (u_short type, struct prefix *name,
+ int (*event) (void *), void *target)
+{
+ struct timeval now;
+
+ gettimeofday (&now, NULL);
+ if (IS_OSPF6_DEBUG_DAMP)
+ zlog_info ("DAMP: Down Event at %lu.%06lu", now.tv_sec, now.tv_usec);
+
+ ospf6_damp_event (event_down, type, name, event, target);
+}
+
+int
+ospf6_damp_debug_thread (struct thread *thread)
+{
+ int i;
+ struct ospf6_damp_info *di;
+ char buf[256];
+ time_t t_now;
+ struct timeval now;
+
+ for (i = 0; i < dc->reuse_list_size; i++)
+ {
+ for (di = dc->reuse_list_array[i]; di; di = di->next)
+ {
+ t_now = time (NULL);
+ gettimeofday (&now, NULL);
+ prefix2str (&di->name, buf, sizeof (buf));
+ zlog_info ("DAMP: %lu.%06lu %c %-32s penalty %7u",
+ now.tv_sec, now.tv_usec,
+ (di->damping == ON ? 'D' : 'A'), buf,
+ (u_int) (di->penalty *
+ ospf6_damp_decay (t_now - di->t_updated)));
+ }
+ }
+ thread_add_timer (master, ospf6_damp_debug_thread, NULL, 1);
+ return 0;
+}
+
+DEFUN (show_ipv6_ospf6_route_flapping,
+ show_ipv6_ospf6_route_flapping_cmd,
+ "show ipv6 ospf6 route flapping",
+ SHOW_STR
+ IP6_STR
+ OSPF6_STR)
+{
+ int i;
+ struct ospf6_damp_info *di;
+ char buf[256];
+ time_t t_now;
+
+ t_now = time (NULL);
+ vty_out (vty, "%c %-32s %7s%s", ' ', "Prefix", "penalty", VTY_NEWLINE);
+
+ for (i = 0; i < dc->reuse_list_size; i++)
+ {
+ for (di = dc->reuse_list_array[i]; di; di = di->next)
+ {
+ prefix2str (&di->name, buf, sizeof (buf));
+ vty_out (vty, "%c %-32s %7u%s",
+ (di->damping == ON ? 'D' : ' '), buf,
+ (u_int) (di->penalty *
+ ospf6_damp_decay (t_now - di->t_updated)),
+ VTY_NEWLINE);
+ }
+ }
+
+ return CMD_SUCCESS;
+}
+
+DEFUN (flap_damping_route,
+ flap_damping_route_cmd,
+ "flap-damping route <0-4294967295> <0-4294967295> "
+ "<0-4294967295> <0-4294967295>",
+ "enable flap dampening\n"
+ "enable route flap dampening\n"
+ "half-life in second\n"
+ "reuse value\n"
+ "suppress value\n"
+ "t-hold in second (maximum time that the target can be damped)\n"
+ )
+{
+ u_int half_life, reuse, suppress, t_hold;
+
+ if (argc)
+ {
+ half_life = (u_int) strtoul (argv[0], NULL, 10);
+ reuse = (u_int) strtoul (argv[1], NULL, 10);
+ suppress = (u_int) strtoul (argv[2], NULL, 10);
+ t_hold = (u_int) strtoul (argv[3], NULL, 10);
+ }
+ else
+ {
+ half_life = (u_int) DEFAULT_HALF_LIFE;
+ reuse = (u_int) DEFAULT_REUSE;
+ suppress = (u_int) DEFAULT_SUPPRESS;
+ t_hold = (u_int) DEFAULT_HALF_LIFE * 4;
+ }
+
+ if (reuse && suppress && reuse >= suppress)
+ {
+ vty_out (vty, "reuse value exceeded suppress value, failed%s\n",
+ VTY_NEWLINE);
+ return CMD_SUCCESS;
+ }
+
+ if (half_life && t_hold && half_life >= t_hold)
+ {
+ vty_out (vty, "half-life exceeded t-hold, failed%s\n", VTY_NEWLINE);
+ return CMD_SUCCESS;
+ }
+
+ ospf6_damp_init_config (half_life, reuse, suppress, t_hold);
+
+ if (ospf6_reuse_thread == NULL)
+ ospf6_reuse_thread =
+ thread_add_timer (master, ospf6_damp_reuse_timer, NULL, dc->delta_reuse);
+
+ return CMD_SUCCESS;
+}
+
+DEFUN (show_ipv6_ospf6_damp_config,
+ show_ipv6_ospf6_camp_config_cmd,
+ "show ipv6 ospf6 damp config",
+ SHOW_STR
+ IP6_STR
+ OSPF6_STR
+ "Flap-dampening information\n"
+ "shows dampening configuration\n"
+ )
+{
+ int i;
+
+ vty_out (vty, "%10s %10s %10s %10s%s",
+ "Half life", "Suppress", "Reuse", "T-hold",
+ VTY_NEWLINE);
+ vty_out (vty, "%10u %10u %10u %10u%s",
+ dc->half_life, dc->suppress, dc->reuse, dc->t_hold,
+ VTY_NEWLINE);
+ vty_out (vty, "%s", VTY_NEWLINE);
+
+ vty_out (vty, "Delta-t = %u%s", dc->delta_t, VTY_NEWLINE);
+ vty_out (vty, "Delta-Reuse = %u%s", dc->delta_reuse, VTY_NEWLINE);
+ vty_out (vty, "Default-Penalty = %u%s", dc->default_penalty, VTY_NEWLINE);
+ vty_out (vty, "Ceiling = %u%s", dc->ceiling, VTY_NEWLINE);
+ vty_out (vty, "ScaleFactor = %f%s", dc->scale_factor, VTY_NEWLINE);
+
+ vty_out (vty, "DecayArray(%d) =%s", dc->decay_array_size, VTY_NEWLINE);
+ for (i = 0; i < dc->decay_array_size; i++)
+ {
+ if (i % 10 == 0)
+ vty_out (vty, " ");
+ vty_out (vty, " %f", dc->decay_array[i]);
+ if (i % 10 == 0)
+ vty_out (vty, "%s", VTY_NEWLINE);
+ }
+ vty_out (vty, "%s", VTY_NEWLINE);
+
+ vty_out (vty, "ReuseIndexArray(%d) =%s",
+ dc->reuse_index_array_size, VTY_NEWLINE);
+ for (i = 0; i < dc->reuse_index_array_size; i++)
+ {
+ if (i % 10 == 0)
+ vty_out (vty, " ");
+ vty_out (vty, " %d", dc->reuse_index_array[i]);
+ if (i % 10 == 0)
+ vty_out (vty, "%s", VTY_NEWLINE);
+ }
+ vty_out (vty, "%s", VTY_NEWLINE);
+
+ return CMD_SUCCESS;
+}
+
+void
+ospf6_damp_config_write (struct vty *vty)
+{
+ if (dc->enabled == ON)
+ {
+ vty_out (vty, " flap-damping route %u %u %u %u%s",
+ dc->half_life, dc->reuse, dc->suppress, dc->t_hold,
+ VTY_NEWLINE);
+ }
+}
+
+DEFUN (debug_ospf6_damp,
+ debug_ospf6_damp_cmd,
+ "debug ospf6 damp",
+ DEBUG_STR
+ OSPF6_STR
+ "Flap-dampening information\n"
+ )
+{
+ ospf6_damp_debug = 1;
+ return CMD_SUCCESS;
+}
+
+DEFUN (no_debug_ospf6_damp,
+ no_debug_ospf6_damp_cmd,
+ "no debug ospf6 damp",
+ NO_STR
+ DEBUG_STR
+ OSPF6_STR
+ "Flap-dampening information\n"
+ )
+{
+ ospf6_damp_debug = 0;
+ return CMD_SUCCESS;
+}
+
+DEFUN (show_debug_ospf6_damp,
+ show_debug_ospf6_damp_cmd,
+ "show debugging ospf6 damp",
+ SHOW_STR
+ DEBUG_STR
+ OSPF6_STR
+ "Flap-dampening information\n"
+ )
+{
+ vty_out (vty, "debugging ospf6 damp is ");
+ if (IS_OSPF6_DEBUG_DAMP)
+ vty_out (vty, "enabled.");
+ else
+ vty_out (vty, "disabled.");
+ vty_out (vty, "%s", VTY_NEWLINE);
+ return CMD_SUCCESS;
+}
+
+void
+ospf6_damp_init ()
+{
+ int i;
+ for (i = 0; i < OSPF6_DAMP_TYPE_MAX; i++)
+ damp_info_table[i] = route_table_init ();
+
+ install_element (VIEW_NODE, &show_ipv6_ospf6_route_flapping_cmd);
+ install_element (ENABLE_NODE, &show_ipv6_ospf6_route_flapping_cmd);
+ install_element (ENABLE_NODE, &show_ipv6_ospf6_camp_config_cmd);
+ install_element (OSPF6_NODE, &flap_damping_route_cmd);
+
+ install_element (ENABLE_NODE, &show_debug_ospf6_damp_cmd);
+ install_element (CONFIG_NODE, &debug_ospf6_damp_cmd);
+ install_element (CONFIG_NODE, &no_debug_ospf6_damp_cmd);
+
+ thread_add_event (master, ospf6_damp_debug_thread, NULL, 0);
+}
+
+#endif /* HAVE_OSPF6_DAMP */
+
+