Annotation of embedaddon/quagga/bgpd/bgp_damp.c, revision 1.1.1.3
1.1 misho 1: /* BGP flap dampening
2: Copyright (C) 2001 IP Infusion Inc.
3:
4: This file is part of GNU Zebra.
5:
6: GNU Zebra is free software; you can redistribute it and/or modify it
7: under the terms of the GNU General Public License as published by the
8: Free Software Foundation; either version 2, or (at your option) any
9: later version.
10:
11: GNU Zebra is distributed in the hope that it will be useful, but
12: WITHOUT ANY WARRANTY; without even the implied warranty of
13: MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
14: General Public License for more details.
15:
16: You should have received a copy of the GNU General Public License
17: along with GNU Zebra; see the file COPYING. If not, write to the Free
18: Software Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA
19: 02111-1307, USA. */
20:
21: #include <zebra.h>
22: #include <math.h>
23:
24: #include "prefix.h"
25: #include "memory.h"
26: #include "command.h"
27: #include "log.h"
28: #include "thread.h"
1.1.1.3 ! misho 29: #include "filter.h"
1.1 misho 30:
31: #include "bgpd/bgpd.h"
32: #include "bgpd/bgp_damp.h"
33: #include "bgpd/bgp_table.h"
34: #include "bgpd/bgp_route.h"
35: #include "bgpd/bgp_attr.h"
36: #include "bgpd/bgp_advertise.h"
37:
38: /* Global variable to access damping configuration */
39: struct bgp_damp_config bgp_damp_cfg;
40: static struct bgp_damp_config *damp = &bgp_damp_cfg;
41:
42: /* Utility macro to add and delete BGP dampening information to no
43: used list. */
44: #define BGP_DAMP_LIST_ADD(N,A) BGP_INFO_ADD(N,A,no_reuse_list)
45: #define BGP_DAMP_LIST_DEL(N,A) BGP_INFO_DEL(N,A,no_reuse_list)
1.1.1.3 ! misho 46:
1.1 misho 47: /* Calculate reuse list index by penalty value. */
48: static int
49: bgp_reuse_index (int penalty)
50: {
51: unsigned int i;
52: int index;
53:
54: i = (int)(((double) penalty / damp->reuse_limit - 1.0) * damp->scale_factor);
55:
56: if ( i >= damp->reuse_index_size )
57: i = damp->reuse_index_size - 1;
58:
59: index = damp->reuse_index[i] - damp->reuse_index[0];
60:
61: return (damp->reuse_offset + index) % damp->reuse_list_size;
62: }
63:
64: /* Add BGP dampening information to reuse list. */
65: static void
66: bgp_reuse_list_add (struct bgp_damp_info *bdi)
67: {
68: int index;
69:
70: index = bdi->index = bgp_reuse_index (bdi->penalty);
71:
72: bdi->prev = NULL;
73: bdi->next = damp->reuse_list[index];
74: if (damp->reuse_list[index])
75: damp->reuse_list[index]->prev = bdi;
76: damp->reuse_list[index] = bdi;
77: }
78:
79: /* Delete BGP dampening information from reuse list. */
80: static void
81: bgp_reuse_list_delete (struct bgp_damp_info *bdi)
82: {
83: if (bdi->next)
84: bdi->next->prev = bdi->prev;
85: if (bdi->prev)
86: bdi->prev->next = bdi->next;
87: else
88: damp->reuse_list[bdi->index] = bdi->next;
89: }
1.1.1.3 ! misho 90:
1.1 misho 91: /* Return decayed penalty value. */
92: int
93: bgp_damp_decay (time_t tdiff, int penalty)
94: {
95: unsigned int i;
96:
97: i = (int) ((double) tdiff / DELTA_T);
98:
99: if (i == 0)
100: return penalty;
101:
102: if (i >= damp->decay_array_size)
103: return 0;
104:
105: return (int) (penalty * damp->decay_array[i]);
106: }
107:
108: /* Handler of reuse timer event. Each route in the current reuse-list
109: is evaluated. RFC2439 Section 4.8.7. */
110: static int
111: bgp_reuse_timer (struct thread *t)
112: {
113: struct bgp_damp_info *bdi;
114: struct bgp_damp_info *next;
115: time_t t_now, t_diff;
116:
117: damp->t_reuse = NULL;
118: damp->t_reuse =
1.1.1.3 ! misho 119: thread_add_timer (bm->master, bgp_reuse_timer, NULL, DELTA_REUSE);
1.1 misho 120:
121: t_now = bgp_clock ();
122:
123: /* 1. save a pointer to the current zeroth queue head and zero the
124: list head entry. */
125: bdi = damp->reuse_list[damp->reuse_offset];
126: damp->reuse_list[damp->reuse_offset] = NULL;
127:
128: /* 2. set offset = modulo reuse-list-size ( offset + 1 ), thereby
129: rotating the circular queue of list-heads. */
130: damp->reuse_offset = (damp->reuse_offset + 1) % damp->reuse_list_size;
131:
132: /* 3. if ( the saved list head pointer is non-empty ) */
133: for (; bdi; bdi = next)
134: {
135: struct bgp *bgp = bdi->binfo->peer->bgp;
136:
137: next = bdi->next;
138:
139: /* Set t-diff = t-now - t-updated. */
140: t_diff = t_now - bdi->t_updated;
141:
142: /* Set figure-of-merit = figure-of-merit * decay-array-ok [t-diff] */
143: bdi->penalty = bgp_damp_decay (t_diff, bdi->penalty);
144:
145: /* Set t-updated = t-now. */
146: bdi->t_updated = t_now;
147:
148: /* if (figure-of-merit < reuse). */
149: if (bdi->penalty < damp->reuse_limit)
150: {
151: /* Reuse the route. */
152: bgp_info_unset_flag (bdi->rn, bdi->binfo, BGP_INFO_DAMPED);
153: bdi->suppress_time = 0;
154:
155: if (bdi->lastrecord == BGP_RECORD_UPDATE)
156: {
157: bgp_info_unset_flag (bdi->rn, bdi->binfo, BGP_INFO_HISTORY);
158: bgp_aggregate_increment (bgp, &bdi->rn->p, bdi->binfo,
159: bdi->afi, bdi->safi);
160: bgp_process (bgp, bdi->rn, bdi->afi, bdi->safi);
161: }
162:
163: if (bdi->penalty <= damp->reuse_limit / 2.0)
164: bgp_damp_info_free (bdi, 1);
165: else
166: BGP_DAMP_LIST_ADD (damp, bdi);
167: }
168: else
169: /* Re-insert into another list (See RFC2439 Section 4.8.6). */
170: bgp_reuse_list_add (bdi);
171: }
172:
173: return 0;
174: }
175:
176: /* A route becomes unreachable (RFC2439 Section 4.8.2). */
177: int
178: bgp_damp_withdraw (struct bgp_info *binfo, struct bgp_node *rn,
179: afi_t afi, safi_t safi, int attr_change)
180: {
181: time_t t_now;
182: struct bgp_damp_info *bdi = NULL;
183: double last_penalty = 0;
184:
185: t_now = bgp_clock ();
186:
187: /* Processing Unreachable Messages. */
188: if (binfo->extra)
189: bdi = binfo->extra->damp_info;
190:
191: if (bdi == NULL)
192: {
193: /* If there is no previous stability history. */
194:
195: /* RFC2439 said:
196: 1. allocate a damping structure.
197: 2. set figure-of-merit = 1.
198: 3. withdraw the route. */
199:
200: bdi = XCALLOC (MTYPE_BGP_DAMP_INFO, sizeof (struct bgp_damp_info));
201: bdi->binfo = binfo;
202: bdi->rn = rn;
203: bdi->penalty = (attr_change ? DEFAULT_PENALTY / 2 : DEFAULT_PENALTY);
204: bdi->flap = 1;
205: bdi->start_time = t_now;
206: bdi->suppress_time = 0;
207: bdi->index = -1;
208: bdi->afi = afi;
209: bdi->safi = safi;
210: (bgp_info_extra_get (binfo))->damp_info = bdi;
211: BGP_DAMP_LIST_ADD (damp, bdi);
212: }
213: else
214: {
215: last_penalty = bdi->penalty;
216:
217: /* 1. Set t-diff = t-now - t-updated. */
218: bdi->penalty =
219: (bgp_damp_decay (t_now - bdi->t_updated, bdi->penalty)
220: + (attr_change ? DEFAULT_PENALTY / 2 : DEFAULT_PENALTY));
221:
222: if (bdi->penalty > damp->ceiling)
223: bdi->penalty = damp->ceiling;
224:
225: bdi->flap++;
226: }
227:
228: assert ((rn == bdi->rn) && (binfo == bdi->binfo));
229:
230: bdi->lastrecord = BGP_RECORD_WITHDRAW;
231: bdi->t_updated = t_now;
232:
233: /* Make this route as historical status. */
234: bgp_info_set_flag (rn, binfo, BGP_INFO_HISTORY);
235:
236: /* Remove the route from a reuse list if it is on one. */
237: if (CHECK_FLAG (bdi->binfo->flags, BGP_INFO_DAMPED))
238: {
239: /* If decay rate isn't equal to 0, reinsert brn. */
240: if (bdi->penalty != last_penalty)
241: {
242: bgp_reuse_list_delete (bdi);
243: bgp_reuse_list_add (bdi);
244: }
245: return BGP_DAMP_SUPPRESSED;
246: }
247:
248: /* If not suppressed before, do annonunce this withdraw and
249: insert into reuse_list. */
250: if (bdi->penalty >= damp->suppress_value)
251: {
252: bgp_info_set_flag (rn, binfo, BGP_INFO_DAMPED);
253: bdi->suppress_time = t_now;
254: BGP_DAMP_LIST_DEL (damp, bdi);
255: bgp_reuse_list_add (bdi);
256: }
257:
258: return BGP_DAMP_USED;
259: }
260:
261: int
262: bgp_damp_update (struct bgp_info *binfo, struct bgp_node *rn,
263: afi_t afi, safi_t safi)
264: {
265: time_t t_now;
266: struct bgp_damp_info *bdi;
267: int status;
268:
269: if (!binfo->extra || !((bdi = binfo->extra->damp_info)))
270: return BGP_DAMP_USED;
271:
272: t_now = bgp_clock ();
273: bgp_info_unset_flag (rn, binfo, BGP_INFO_HISTORY);
274:
275: bdi->lastrecord = BGP_RECORD_UPDATE;
276: bdi->penalty = bgp_damp_decay (t_now - bdi->t_updated, bdi->penalty);
277:
278: if (! CHECK_FLAG (bdi->binfo->flags, BGP_INFO_DAMPED)
279: && (bdi->penalty < damp->suppress_value))
280: status = BGP_DAMP_USED;
281: else if (CHECK_FLAG (bdi->binfo->flags, BGP_INFO_DAMPED)
282: && (bdi->penalty < damp->reuse_limit) )
283: {
284: bgp_info_unset_flag (rn, binfo, BGP_INFO_DAMPED);
285: bgp_reuse_list_delete (bdi);
286: BGP_DAMP_LIST_ADD (damp, bdi);
287: bdi->suppress_time = 0;
288: status = BGP_DAMP_USED;
289: }
290: else
291: status = BGP_DAMP_SUPPRESSED;
292:
293: if (bdi->penalty > damp->reuse_limit / 2.0)
294: bdi->t_updated = t_now;
295: else
296: bgp_damp_info_free (bdi, 0);
297:
298: return status;
299: }
300:
301: /* Remove dampening information and history route. */
302: int
303: bgp_damp_scan (struct bgp_info *binfo, afi_t afi, safi_t safi)
304: {
305: time_t t_now, t_diff;
306: struct bgp_damp_info *bdi;
307:
308: assert (binfo->extra && binfo->extra->damp_info);
309:
310: t_now = bgp_clock ();
311: bdi = binfo->extra->damp_info;
312:
313: if (CHECK_FLAG (binfo->flags, BGP_INFO_DAMPED))
314: {
315: t_diff = t_now - bdi->suppress_time;
316:
317: if (t_diff >= damp->max_suppress_time)
318: {
319: bgp_info_unset_flag (bdi->rn, binfo, BGP_INFO_DAMPED);
320: bgp_reuse_list_delete (bdi);
321: BGP_DAMP_LIST_ADD (damp, bdi);
322: bdi->penalty = damp->reuse_limit;
323: bdi->suppress_time = 0;
324: bdi->t_updated = t_now;
325:
326: /* Need to announce UPDATE once this binfo is usable again. */
327: if (bdi->lastrecord == BGP_RECORD_UPDATE)
328: return 1;
329: else
330: return 0;
331: }
332: }
333: else
334: {
335: t_diff = t_now - bdi->t_updated;
336: bdi->penalty = bgp_damp_decay (t_diff, bdi->penalty);
337:
338: if (bdi->penalty <= damp->reuse_limit / 2.0)
339: {
340: /* release the bdi, bdi->binfo. */
341: bgp_damp_info_free (bdi, 1);
342: return 0;
343: }
344: else
345: bdi->t_updated = t_now;
346: }
347: return 0;
348: }
349:
350: void
351: bgp_damp_info_free (struct bgp_damp_info *bdi, int withdraw)
352: {
353: struct bgp_info *binfo;
354:
355: if (! bdi)
356: return;
357:
358: binfo = bdi->binfo;
359: binfo->extra->damp_info = NULL;
360:
361: if (CHECK_FLAG (binfo->flags, BGP_INFO_DAMPED))
362: bgp_reuse_list_delete (bdi);
363: else
364: BGP_DAMP_LIST_DEL (damp, bdi);
365:
366: bgp_info_unset_flag (bdi->rn, binfo, BGP_INFO_HISTORY|BGP_INFO_DAMPED);
367:
368: if (bdi->lastrecord == BGP_RECORD_WITHDRAW && withdraw)
369: bgp_info_delete (bdi->rn, binfo);
370:
371: XFREE (MTYPE_BGP_DAMP_INFO, bdi);
372: }
373:
374: static void
375: bgp_damp_parameter_set (int hlife, int reuse, int sup, int maxsup)
376: {
377: double reuse_max_ratio;
378: unsigned int i;
379: double j;
380:
381: damp->suppress_value = sup;
382: damp->half_life = hlife;
383: damp->reuse_limit = reuse;
384: damp->max_suppress_time = maxsup;
385:
386: /* Initialize params per bgp_damp_config. */
387: damp->reuse_index_size = REUSE_ARRAY_SIZE;
388:
389: damp->ceiling = (int)(damp->reuse_limit * (pow(2, (double)damp->max_suppress_time/damp->half_life)));
390:
391: /* Decay-array computations */
392: damp->decay_array_size = ceil ((double) damp->max_suppress_time / DELTA_T);
393: damp->decay_array = XMALLOC (MTYPE_BGP_DAMP_ARRAY,
394: sizeof(double) * (damp->decay_array_size));
395: damp->decay_array[0] = 1.0;
396: damp->decay_array[1] = exp ((1.0/((double)damp->half_life/DELTA_T)) * log(0.5));
397:
398: /* Calculate decay values for all possible times */
399: for (i = 2; i < damp->decay_array_size; i++)
400: damp->decay_array[i] = damp->decay_array[i-1] * damp->decay_array[1];
401:
402: /* Reuse-list computations */
403: i = ceil ((double)damp->max_suppress_time / DELTA_REUSE) + 1;
404: if (i > REUSE_LIST_SIZE || i == 0)
405: i = REUSE_LIST_SIZE;
406: damp->reuse_list_size = i;
407:
408: damp->reuse_list = XCALLOC (MTYPE_BGP_DAMP_ARRAY,
409: damp->reuse_list_size
410: * sizeof (struct bgp_reuse_node *));
411:
412: /* Reuse-array computations */
413: damp->reuse_index = XCALLOC (MTYPE_BGP_DAMP_ARRAY,
414: sizeof(int) * damp->reuse_index_size);
415:
416: reuse_max_ratio = (double)damp->ceiling/damp->reuse_limit;
417: j = (exp((double)damp->max_suppress_time/damp->half_life) * log10(2.0));
418: if ( reuse_max_ratio > j && j != 0 )
419: reuse_max_ratio = j;
420:
421: damp->scale_factor = (double)damp->reuse_index_size/(reuse_max_ratio - 1);
422:
423: for (i = 0; i < damp->reuse_index_size; i++)
424: {
425: damp->reuse_index[i] =
426: (int)(((double)damp->half_life / DELTA_REUSE)
427: * log10 (1.0 / (damp->reuse_limit * ( 1.0 + ((double)i/damp->scale_factor)))) / log10(0.5));
428: }
429: }
430:
431: int
432: bgp_damp_enable (struct bgp *bgp, afi_t afi, safi_t safi, time_t half,
433: unsigned int reuse, unsigned int suppress, time_t max)
434: {
435: if (CHECK_FLAG (bgp->af_flags[afi][safi], BGP_CONFIG_DAMPENING))
436: {
437: if (damp->half_life == half
438: && damp->reuse_limit == reuse
439: && damp->suppress_value == suppress
440: && damp->max_suppress_time == max)
441: return 0;
442: bgp_damp_disable (bgp, afi, safi);
443: }
444:
445: SET_FLAG (bgp->af_flags[afi][safi], BGP_CONFIG_DAMPENING);
446: bgp_damp_parameter_set (half, reuse, suppress, max);
447:
448: /* Register reuse timer. */
449: if (! damp->t_reuse)
450: damp->t_reuse =
1.1.1.3 ! misho 451: thread_add_timer (bm->master, bgp_reuse_timer, NULL, DELTA_REUSE);
1.1 misho 452:
453: return 0;
454: }
455:
456: static void
457: bgp_damp_config_clean (struct bgp_damp_config *damp)
458: {
459: /* Free decay array */
460: XFREE (MTYPE_BGP_DAMP_ARRAY, damp->decay_array);
461:
462: /* Free reuse index array */
463: XFREE (MTYPE_BGP_DAMP_ARRAY, damp->reuse_index);
464:
465: /* Free reuse list array. */
466: XFREE (MTYPE_BGP_DAMP_ARRAY, damp->reuse_list);
467: }
468:
469: /* Clean all the bgp_damp_info stored in reuse_list. */
470: void
471: bgp_damp_info_clean (void)
472: {
473: unsigned int i;
474: struct bgp_damp_info *bdi, *next;
475:
476: damp->reuse_offset = 0;
477:
478: for (i = 0; i < damp->reuse_list_size; i++)
479: {
480: if (! damp->reuse_list[i])
481: continue;
482:
483: for (bdi = damp->reuse_list[i]; bdi; bdi = next)
484: {
485: next = bdi->next;
486: bgp_damp_info_free (bdi, 1);
487: }
488: damp->reuse_list[i] = NULL;
489: }
490:
491: for (bdi = damp->no_reuse_list; bdi; bdi = next)
492: {
493: next = bdi->next;
494: bgp_damp_info_free (bdi, 1);
495: }
496: damp->no_reuse_list = NULL;
497: }
498:
499: int
500: bgp_damp_disable (struct bgp *bgp, afi_t afi, safi_t safi)
501: {
1.1.1.2 misho 502: /* If it wasn't enabled, there's nothing to do. */
503: if (! CHECK_FLAG (bgp->af_flags[afi][safi], BGP_CONFIG_DAMPENING))
504: return 0;
505:
1.1 misho 506: /* Cancel reuse thread. */
507: if (damp->t_reuse )
508: thread_cancel (damp->t_reuse);
509: damp->t_reuse = NULL;
510:
511: /* Clean BGP dampening information. */
512: bgp_damp_info_clean ();
513:
514: /* Clear configuration */
515: bgp_damp_config_clean (&bgp_damp_cfg);
516:
517: UNSET_FLAG (bgp->af_flags[afi][safi], BGP_CONFIG_DAMPENING);
518: return 0;
519: }
520:
521: void
522: bgp_config_write_damp (struct vty *vty)
523: {
524: if (bgp_damp_cfg.half_life == DEFAULT_HALF_LIFE*60
525: && bgp_damp_cfg.reuse_limit == DEFAULT_REUSE
526: && bgp_damp_cfg.suppress_value == DEFAULT_SUPPRESS
527: && bgp_damp_cfg.max_suppress_time == bgp_damp_cfg.half_life*4)
528: vty_out (vty, " bgp dampening%s", VTY_NEWLINE);
529: else if (bgp_damp_cfg.half_life != DEFAULT_HALF_LIFE*60
530: && bgp_damp_cfg.reuse_limit == DEFAULT_REUSE
531: && bgp_damp_cfg.suppress_value == DEFAULT_SUPPRESS
532: && bgp_damp_cfg.max_suppress_time == bgp_damp_cfg.half_life*4)
1.1.1.3 ! misho 533: vty_out (vty, " bgp dampening %lld%s",
! 534: bgp_damp_cfg.half_life/60LL,
1.1 misho 535: VTY_NEWLINE);
536: else
1.1.1.3 ! misho 537: vty_out (vty, " bgp dampening %lld %d %d %lld%s",
! 538: bgp_damp_cfg.half_life/60LL,
1.1 misho 539: bgp_damp_cfg.reuse_limit,
540: bgp_damp_cfg.suppress_value,
1.1.1.3 ! misho 541: bgp_damp_cfg.max_suppress_time/60LL,
1.1 misho 542: VTY_NEWLINE);
543: }
544:
545: static const char *
546: bgp_get_reuse_time (unsigned int penalty, char *buf, size_t len)
547: {
548: time_t reuse_time = 0;
549: struct tm *tm = NULL;
550:
551: if (penalty > damp->reuse_limit)
552: {
553: reuse_time = (int) (DELTA_T * ((log((double)damp->reuse_limit/penalty))/(log(damp->decay_array[1]))));
554:
555: if (reuse_time > damp->max_suppress_time)
556: reuse_time = damp->max_suppress_time;
557:
558: tm = gmtime (&reuse_time);
559: }
560: else
561: reuse_time = 0;
562:
563: /* Making formatted timer strings. */
564: #define ONE_DAY_SECOND 60*60*24
565: #define ONE_WEEK_SECOND 60*60*24*7
566: if (reuse_time == 0)
567: snprintf (buf, len, "00:00:00");
568: else if (reuse_time < ONE_DAY_SECOND)
569: snprintf (buf, len, "%02d:%02d:%02d",
570: tm->tm_hour, tm->tm_min, tm->tm_sec);
571: else if (reuse_time < ONE_WEEK_SECOND)
572: snprintf (buf, len, "%dd%02dh%02dm",
573: tm->tm_yday, tm->tm_hour, tm->tm_min);
574: else
575: snprintf (buf, len, "%02dw%dd%02dh",
576: tm->tm_yday/7, tm->tm_yday - ((tm->tm_yday/7) * 7), tm->tm_hour);
577:
578: return buf;
579: }
580:
581: void
582: bgp_damp_info_vty (struct vty *vty, struct bgp_info *binfo)
583: {
584: struct bgp_damp_info *bdi;
585: time_t t_now, t_diff;
586: char timebuf[BGP_UPTIME_LEN];
587: int penalty;
588:
589: if (!binfo->extra)
590: return;
591:
592: /* BGP dampening information. */
593: bdi = binfo->extra->damp_info;
594:
595: /* If dampening is not enabled or there is no dampening information,
596: return immediately. */
597: if (! damp || ! bdi)
598: return;
599:
600: /* Calculate new penalty. */
601: t_now = bgp_clock ();
602: t_diff = t_now - bdi->t_updated;
603: penalty = bgp_damp_decay (t_diff, bdi->penalty);
604:
605: vty_out (vty, " Dampinfo: penalty %d, flapped %d times in %s",
606: penalty, bdi->flap,
607: peer_uptime (bdi->start_time, timebuf, BGP_UPTIME_LEN));
608:
609: if (CHECK_FLAG (binfo->flags, BGP_INFO_DAMPED)
610: && ! CHECK_FLAG (binfo->flags, BGP_INFO_HISTORY))
611: vty_out (vty, ", reuse in %s",
612: bgp_get_reuse_time (penalty, timebuf, BGP_UPTIME_LEN));
613:
614: vty_out (vty, "%s", VTY_NEWLINE);
615: }
616:
617: const char *
618: bgp_damp_reuse_time_vty (struct vty *vty, struct bgp_info *binfo,
619: char *timebuf, size_t len)
620: {
621: struct bgp_damp_info *bdi;
622: time_t t_now, t_diff;
623: int penalty;
624:
625: if (!binfo->extra)
626: return NULL;
627:
628: /* BGP dampening information. */
629: bdi = binfo->extra->damp_info;
630:
631: /* If dampening is not enabled or there is no dampening information,
632: return immediately. */
633: if (! damp || ! bdi)
634: return NULL;
635:
636: /* Calculate new penalty. */
637: t_now = bgp_clock ();
638: t_diff = t_now - bdi->t_updated;
639: penalty = bgp_damp_decay (t_diff, bdi->penalty);
640:
641: return bgp_get_reuse_time (penalty, timebuf, len);
1.1.1.3 ! misho 642: }
! 643:
! 644: int
! 645: bgp_show_dampening_parameters (struct vty *vty, afi_t afi, safi_t safi)
! 646: {
! 647: struct bgp *bgp;
! 648: bgp = bgp_get_default();
! 649:
! 650: if (bgp == NULL)
! 651: {
! 652: vty_out (vty, "No BGP process is configured%s", VTY_NEWLINE);
! 653: return CMD_WARNING;
! 654: }
! 655:
! 656: if (CHECK_FLAG (bgp->af_flags[afi][safi], BGP_CONFIG_DAMPENING))
! 657: {
! 658: vty_out (vty, "Half-life time: %ld min%s",
! 659: damp->half_life / 60, VTY_NEWLINE);
! 660: vty_out (vty, "Reuse penalty: %d%s",
! 661: damp->reuse_limit, VTY_NEWLINE);
! 662: vty_out (vty, "Suppress penalty: %d%s",
! 663: damp->suppress_value, VTY_NEWLINE);
! 664: vty_out (vty, "Max suppress time: %ld min%s",
! 665: damp->max_suppress_time / 60, VTY_NEWLINE);
! 666: vty_out (vty, "Max supress penalty: %u%s",
! 667: damp->ceiling, VTY_NEWLINE);
! 668: vty_out (vty, "%s", VTY_NEWLINE);
! 669: }
! 670: else
! 671: vty_out (vty, "dampening not enabled for %s%s",
! 672: afi == AFI_IP ? "IPv4" : "IPv6", VTY_NEWLINE);
! 673:
! 674: return CMD_SUCCESS;
1.1 misho 675: }
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