[mirror_frr.git] / isisd / isis_dr.c

// SPDX-License-Identifier: GPL-2.0-or-later
/*
 * IS-IS Rout(e)ing protocol - isis_dr.c
 *                             IS-IS designated router related routines
 *
 * Copyright (C) 2001,2002   Sampo Saaristo
 *                           Tampere University of Technology
 *                           Institute of Communications Engineering
 */


#include <zebra.h>

#include "log.h"
#include "hash.h"
#include "frrevent.h"
#include "linklist.h"
#include "vty.h"
#include "stream.h"
#include "if.h"

#include "isisd/isis_constants.h"
#include "isisd/isis_common.h"
#include "isisd/isis_misc.h"
#include "isisd/isis_flags.h"
#include "isisd/isis_circuit.h"
#include "isisd/isisd.h"
#include "isisd/isis_adjacency.h"
#include "isisd/isis_constants.h"
#include "isisd/isis_pdu.h"
#include "isisd/isis_lsp.h"
#include "isisd/isis_dr.h"
#include "isisd/isis_events.h"

const char *isis_disflag2string(int disflag)
{

	switch (disflag) {
	case ISIS_IS_NOT_DIS:
		return "is not DIS";
	case ISIS_IS_DIS:
		return "is DIS";
	case ISIS_WAS_DIS:
		return "was DIS";
	default:
		return "unknown DIS state";
	}
	return NULL; /* not reached */
}

void isis_run_dr(struct event *thread)
{
	struct isis_circuit_arg *arg = EVENT_ARG(thread);

	assert(arg);

	struct isis_circuit *circuit = arg->circuit;
	int level = arg->level;

	assert(circuit);

	if (circuit->circ_type != CIRCUIT_T_BROADCAST) {
		zlog_warn("%s: scheduled for non broadcast circuit from %s:%d",
			  __func__, thread->xref->xref.file,
			  thread->xref->xref.line);
		return;
	}

	if (circuit->u.bc.run_dr_elect[level - 1])
		zlog_warn("%s: run_dr_elect already set for l%d", __func__,
			  level);

	circuit->u.bc.t_run_dr[level - 1] = NULL;
	circuit->u.bc.run_dr_elect[level - 1] = 1;
}

static int isis_check_dr_change(struct isis_adjacency *adj, int level)
{
	int i;

	if (adj->dis_record[level - 1].dis
	    != adj->dis_record[(1 * ISIS_LEVELS) + level - 1].dis)
	/* was there a DIS state transition ? */
	{
		adj->dischanges[level - 1]++;
		adj->circuit->desig_changes[level - 1]++;
		/* ok rotate the history list through */
		for (i = DIS_RECORDS - 1; i > 0; i--) {
			adj->dis_record[(i * ISIS_LEVELS) + level - 1].dis =
				adj->dis_record[((i - 1) * ISIS_LEVELS) + level
						- 1]
					.dis;
			adj->dis_record[(i * ISIS_LEVELS) + level - 1]
				.last_dis_change =
				adj->dis_record[((i - 1) * ISIS_LEVELS) + level
						- 1]
					.last_dis_change;
		}
	}
	return ISIS_OK;
}

int isis_dr_elect(struct isis_circuit *circuit, int level)
{
	struct list *adjdb;
	struct listnode *node;
	struct isis_adjacency *adj, *adj_dr = NULL;
	struct list *list = list_new();
	uint8_t own_prio;
	int biggest_prio = -1;
	int cmp_res, retval = ISIS_OK;

	own_prio = circuit->priority[level - 1];
	adjdb = circuit->u.bc.adjdb[level - 1];

	if (!adjdb) {
		zlog_warn("%s adjdb == NULL", __func__);
		list_delete(&list);
		return ISIS_WARNING;
	}
	isis_adj_build_up_list(adjdb, list);

	/*
	 * Loop the adjacencies and find the one with the biggest priority
	 */
	for (ALL_LIST_ELEMENTS_RO(list, node, adj)) {
		/* clear flag for show output */
		adj->dis_record[level - 1].dis = ISIS_IS_NOT_DIS;
		adj->dis_record[level - 1].last_dis_change = time(NULL);

		if (adj->prio[level - 1] > biggest_prio) {
			biggest_prio = adj->prio[level - 1];
			adj_dr = adj;
		} else if (adj->prio[level - 1] == biggest_prio) {
			/*
			 * Comparison of MACs breaks a tie
			 */
			if (adj_dr) {
				cmp_res = memcmp(adj_dr->snpa, adj->snpa,
						 ETH_ALEN);
				if (cmp_res < 0) {
					adj_dr = adj;
				}
				if (cmp_res == 0)
					zlog_warn(
						"%s: multiple adjacencies with same SNPA",
						__func__);
			} else {
				adj_dr = adj;
			}
		}
	}

	if (!adj_dr) {
		/*
		 * Could not find the DR - means we are alone. Resign if we were
		 * DR.
		 */
		if (circuit->u.bc.is_dr[level - 1])
			retval = isis_dr_resign(circuit, level);
		list_delete(&list);
		return retval;
	}

	/*
	 * Now we have the DR adjacency, compare it to self
	 */
	if (adj_dr->prio[level - 1] < own_prio
	    || (adj_dr->prio[level - 1] == own_prio
		&& memcmp(adj_dr->snpa, circuit->u.bc.snpa, ETH_ALEN) < 0)) {
		adj_dr->dis_record[level - 1].dis = ISIS_IS_NOT_DIS;
		adj_dr->dis_record[level - 1].last_dis_change = time(NULL);

		/* rotate the history log */
		for (ALL_LIST_ELEMENTS_RO(list, node, adj))
			isis_check_dr_change(adj, level);

		/* We are the DR, commence DR */
		if (circuit->u.bc.is_dr[level - 1] == 0 && listcount(list) > 0)
			retval = isis_dr_commence(circuit, level);
	} else {
		/* ok we have found the DIS - lets mark the adjacency */
		/* set flag for show output */
		adj_dr->dis_record[level - 1].dis = ISIS_IS_DIS;
		adj_dr->dis_record[level - 1].last_dis_change = time(NULL);

		/* now loop through a second time to check if there has been a
		 * DIS change
		 * if yes rotate the history log
		 */

		for (ALL_LIST_ELEMENTS_RO(list, node, adj))
			isis_check_dr_change(adj, level);

		/*
		 * We are not DR - if we were -> resign
		 */
		if (circuit->u.bc.is_dr[level - 1])
			retval = isis_dr_resign(circuit, level);
	}
	list_delete(&list);
	return retval;
}

int isis_dr_resign(struct isis_circuit *circuit, int level)
{
	uint8_t id[ISIS_SYS_ID_LEN + 2];

	if (IS_DEBUG_EVENTS)
		zlog_debug("%s l%d", __func__, level);

	circuit->u.bc.is_dr[level - 1] = 0;
	circuit->u.bc.run_dr_elect[level - 1] = 0;
	EVENT_OFF(circuit->u.bc.t_run_dr[level - 1]);
	EVENT_OFF(circuit->u.bc.t_refresh_pseudo_lsp[level - 1]);
	circuit->lsp_regenerate_pending[level - 1] = 0;

	memcpy(id, circuit->isis->sysid, ISIS_SYS_ID_LEN);
	LSP_PSEUDO_ID(id) = circuit->circuit_id;
	LSP_FRAGMENT(id) = 0;
	lsp_purge_pseudo(id, circuit, level);

	if (level == 1) {
		memset(circuit->u.bc.l1_desig_is, 0, ISIS_SYS_ID_LEN + 1);

		event_add_timer(master, send_l1_psnp, circuit,
				isis_jitter(circuit->psnp_interval[level - 1],
					    PSNP_JITTER),
				&circuit->t_send_psnp[0]);
	} else {
		memset(circuit->u.bc.l2_desig_is, 0, ISIS_SYS_ID_LEN + 1);

		event_add_timer(master, send_l2_psnp, circuit,
				isis_jitter(circuit->psnp_interval[level - 1],
					    PSNP_JITTER),
				&circuit->t_send_psnp[1]);
	}

	EVENT_OFF(circuit->t_send_csnp[level - 1]);

	event_add_timer(master, isis_run_dr, &circuit->level_arg[level - 1],
			2 * circuit->hello_interval[level - 1],
			&circuit->u.bc.t_run_dr[level - 1]);


	event_add_event(master, isis_event_dis_status_change, circuit, 0, NULL);

	return ISIS_OK;
}

int isis_dr_commence(struct isis_circuit *circuit, int level)
{
	uint8_t old_dr[ISIS_SYS_ID_LEN + 2];

	if (IS_DEBUG_EVENTS)
		zlog_debug("%s l%d", __func__, level);

	/* Lets keep a pause in DR election */
	circuit->u.bc.run_dr_elect[level - 1] = 0;
	circuit->u.bc.is_dr[level - 1] = 1;

	if (level == 1) {
		memcpy(old_dr, circuit->u.bc.l1_desig_is, ISIS_SYS_ID_LEN + 1);
		LSP_FRAGMENT(old_dr) = 0;
		if (LSP_PSEUDO_ID(old_dr)) {
			/* there was a dr elected, purge its LSPs from the db */
			lsp_purge_pseudo(old_dr, circuit, level);
		}
		memcpy(circuit->u.bc.l1_desig_is, circuit->isis->sysid,
		       ISIS_SYS_ID_LEN);
		*(circuit->u.bc.l1_desig_is + ISIS_SYS_ID_LEN) =
			circuit->circuit_id;

		assert(circuit->circuit_id); /* must be non-zero */
		lsp_generate_pseudo(circuit, 1);

		event_add_timer(master, send_l1_csnp, circuit,
				isis_jitter(circuit->csnp_interval[level - 1],
					    CSNP_JITTER),
				&circuit->t_send_csnp[0]);

	} else {
		memcpy(old_dr, circuit->u.bc.l2_desig_is, ISIS_SYS_ID_LEN + 1);
		LSP_FRAGMENT(old_dr) = 0;
		if (LSP_PSEUDO_ID(old_dr)) {
			/* there was a dr elected, purge its LSPs from the db */
			lsp_purge_pseudo(old_dr, circuit, level);
		}
		memcpy(circuit->u.bc.l2_desig_is, circuit->isis->sysid,
		       ISIS_SYS_ID_LEN);
		*(circuit->u.bc.l2_desig_is + ISIS_SYS_ID_LEN) =
			circuit->circuit_id;

		assert(circuit->circuit_id); /* must be non-zero */
		lsp_generate_pseudo(circuit, 2);

		event_add_timer(master, send_l2_csnp, circuit,
				isis_jitter(circuit->csnp_interval[level - 1],
					    CSNP_JITTER),
				&circuit->t_send_csnp[1]);
	}

	event_add_timer(master, isis_run_dr, &circuit->level_arg[level - 1],
			2 * circuit->hello_interval[level - 1],
			&circuit->u.bc.t_run_dr[level - 1]);
	event_add_event(master, isis_event_dis_status_change, circuit, 0, NULL);

	return ISIS_OK;
}
Commit	Line	Data
acddc0ed	1	// SPDX-License-Identifier: GPL-2.0-or-later
eb5d44eb	2	/*
eb5d44eb	3	* IS-IS Rout(e)ing protocol - isis_dr.c
d62a17ae	4	* IS-IS designated router related routines
eb5d44eb	5	*
eb5d44eb	6	* Copyright (C) 2001,2002 Sampo Saaristo
d62a17ae	7	* Tampere University of Technology
eb5d44eb	8	* Institute of Communications Engineering
eb5d44eb	9	*/
	10
	11
	12	#include <zebra.h>
eb5d44eb	13
	14	#include "log.h"
	15	#include "hash.h"
24a58196	16	#include "frrevent.h"
eb5d44eb	17	#include "linklist.h"
	18	#include "vty.h"
	19	#include "stream.h"
	20	#include "if.h"
	21
eb5d44eb	22	#include "isisd/isis_constants.h"
	23	#include "isisd/isis_common.h"
	24	#include "isisd/isis_misc.h"
	25	#include "isisd/isis_flags.h"
	26	#include "isisd/isis_circuit.h"
	27	#include "isisd/isisd.h"
	28	#include "isisd/isis_adjacency.h"
	29	#include "isisd/isis_constants.h"
	30	#include "isisd/isis_pdu.h"
eb5d44eb	31	#include "isisd/isis_lsp.h"
	32	#include "isisd/isis_dr.h"
	33	#include "isisd/isis_events.h"
	34
d62a17ae	35	const char *isis_disflag2string(int disflag)
f390d2c7	36	{
eb5d44eb	37
d62a17ae	38	switch (disflag) {
	39	case ISIS_IS_NOT_DIS:
	40	return "is not DIS";
	41	case ISIS_IS_DIS:
	42	return "is DIS";
	43	case ISIS_WAS_DIS:
	44	return "was DIS";
	45	default:
	46	return "unknown DIS state";
	47	}
	48	return NULL; /* not reached */
eb5d44eb	49	}
eb5d44eb	50
e6685141	51	void isis_run_dr(struct event *thread)
eb5d44eb	52	{
e16d030c	53	struct isis_circuit_arg *arg = EVENT_ARG(thread);
f390d2c7	54
7c4f7aab	55	assert(arg);
f390d2c7	56
7c4f7aab CF	57	struct isis_circuit *circuit = arg->circuit;
7c4f7aab CF	58	int level = arg->level;
eb5d44eb	59
d62a17ae	60	assert(circuit);
eb5d44eb	61
7c4f7aab CF	62	if (circuit->circ_type != CIRCUIT_T_BROADCAST) {
7c4f7aab CF	63	zlog_warn("%s: scheduled for non broadcast circuit from %s:%d",
60a3efec DL	64	__func__, thread->xref->xref.file,
60a3efec DL	65	thread->xref->xref.line);
cc9f21da	66	return;
7c4f7aab	67	}
f390d2c7	68
7c4f7aab	69	if (circuit->u.bc.run_dr_elect[level - 1])
1f46f33f	70	zlog_warn("%s: run_dr_elect already set for l%d", __func__,
1f46f33f	71	level);
f390d2c7	72
7c4f7aab CF	73	circuit->u.bc.t_run_dr[level - 1] = NULL;
7c4f7aab CF	74	circuit->u.bc.run_dr_elect[level - 1] = 1;
eb5d44eb	75	}
eb5d44eb	76
d62a17ae	77	static int isis_check_dr_change(struct isis_adjacency *adj, int level)
eb5d44eb	78	{
d62a17ae	79	int i;
	80
	81	if (adj->dis_record[level - 1].dis
	82	!= adj->dis_record[(1 * ISIS_LEVELS) + level - 1].dis)
	83	/* was there a DIS state transition ? */
eb5d44eb	84	{
d62a17ae	85	adj->dischanges[level - 1]++;
1ee746d9	86	adj->circuit->desig_changes[level - 1]++;
d62a17ae	87	/* ok rotate the history list through */
	88	for (i = DIS_RECORDS - 1; i > 0; i--) {
	89	adj->dis_record[(i * ISIS_LEVELS) + level - 1].dis =
	90	adj->dis_record[((i - 1) * ISIS_LEVELS) + level
	91	- 1]
	92	.dis;
	93	adj->dis_record[(i * ISIS_LEVELS) + level - 1]
	94	.last_dis_change =
	95	adj->dis_record[((i - 1) * ISIS_LEVELS) + level
	96	- 1]
	97	.last_dis_change;
	98	}
eb5d44eb	99	}
d62a17ae	100	return ISIS_OK;
eb5d44eb	101	}
eb5d44eb	102
d62a17ae	103	int isis_dr_elect(struct isis_circuit *circuit, int level)
eb5d44eb	104	{
d62a17ae	105	struct list *adjdb;
	106	struct listnode *node;
	107	struct isis_adjacency adj, adj_dr = NULL;
	108	struct list *list = list_new();
d7c0a89a	109	uint8_t own_prio;
d62a17ae	110	int biggest_prio = -1;
	111	int cmp_res, retval = ISIS_OK;
	112
	113	own_prio = circuit->priority[level - 1];
	114	adjdb = circuit->u.bc.adjdb[level - 1];
	115
	116	if (!adjdb) {
1f46f33f	117	zlog_warn("%s adjdb == NULL", __func__);
6a154c88	118	list_delete(&list);
d62a17ae	119	return ISIS_WARNING;
f390d2c7	120	}
d62a17ae	121	isis_adj_build_up_list(adjdb, list);
	122
	123	/*
	124	* Loop the adjacencies and find the one with the biggest priority
	125	*/
	126	for (ALL_LIST_ELEMENTS_RO(list, node, adj)) {
	127	/* clear flag for show output */
	128	adj->dis_record[level - 1].dis = ISIS_IS_NOT_DIS;
	129	adj->dis_record[level - 1].last_dis_change = time(NULL);
	130
	131	if (adj->prio[level - 1] > biggest_prio) {
	132	biggest_prio = adj->prio[level - 1];
	133	adj_dr = adj;
	134	} else if (adj->prio[level - 1] == biggest_prio) {
	135	/*
	136	* Comparison of MACs breaks a tie
	137	*/
	138	if (adj_dr) {
	139	cmp_res = memcmp(adj_dr->snpa, adj->snpa,
	140	ETH_ALEN);
	141	if (cmp_res < 0) {
	142	adj_dr = adj;
	143	}
	144	if (cmp_res == 0)
	145	zlog_warn(
1f46f33f	146	"%s: multiple adjacencies with same SNPA",
1f46f33f	147	__func__);
d62a17ae	148	} else {
	149	adj_dr = adj;
	150	}
f390d2c7	151	}
f390d2c7	152	}
d62a17ae	153
	154	if (!adj_dr) {
	155	/*
	156	* Could not find the DR - means we are alone. Resign if we were
	157	* DR.
	158	*/
	159	if (circuit->u.bc.is_dr[level - 1])
	160	retval = isis_dr_resign(circuit, level);
6a154c88	161	list_delete(&list);
d62a17ae	162	return retval;
	163	}
	164
	165	/*
	166	* Now we have the DR adjacency, compare it to self
	167	*/
	168	if (adj_dr->prio[level - 1] < own_prio
	169	\|\| (adj_dr->prio[level - 1] == own_prio
	170	&& memcmp(adj_dr->snpa, circuit->u.bc.snpa, ETH_ALEN) < 0)) {
	171	adj_dr->dis_record[level - 1].dis = ISIS_IS_NOT_DIS;
	172	adj_dr->dis_record[level - 1].last_dis_change = time(NULL);
	173
	174	/* rotate the history log */
	175	for (ALL_LIST_ELEMENTS_RO(list, node, adj))
	176	isis_check_dr_change(adj, level);
	177
	178	/* We are the DR, commence DR */
	179	if (circuit->u.bc.is_dr[level - 1] == 0 && listcount(list) > 0)
	180	retval = isis_dr_commence(circuit, level);
	181	} else {
	182	/* ok we have found the DIS - lets mark the adjacency */
	183	/* set flag for show output */
	184	adj_dr->dis_record[level - 1].dis = ISIS_IS_DIS;
	185	adj_dr->dis_record[level - 1].last_dis_change = time(NULL);
	186
	187	/* now loop through a second time to check if there has been a
	188	* DIS change
	189	* if yes rotate the history log
	190	*/
	191
	192	for (ALL_LIST_ELEMENTS_RO(list, node, adj))
	193	isis_check_dr_change(adj, level);
	194
	195	/*
	196	* We are not DR - if we were -> resign
	197	*/
	198	if (circuit->u.bc.is_dr[level - 1])
	199	retval = isis_dr_resign(circuit, level);
	200	}
6a154c88	201	list_delete(&list);
d62a17ae	202	return retval;
eb5d44eb	203	}
eb5d44eb	204
d62a17ae	205	int isis_dr_resign(struct isis_circuit *circuit, int level)
eb5d44eb	206	{
d7c0a89a	207	uint8_t id[ISIS_SYS_ID_LEN + 2];
f390d2c7	208
e6605a89	209	if (IS_DEBUG_EVENTS)
1f46f33f	210	zlog_debug("%s l%d", __func__, level);
eb5d44eb	211
d62a17ae	212	circuit->u.bc.is_dr[level - 1] = 0;
d62a17ae	213	circuit->u.bc.run_dr_elect[level - 1] = 0;
e16d030c DS	214	EVENT_OFF(circuit->u.bc.t_run_dr[level - 1]);
e16d030c DS	215	EVENT_OFF(circuit->u.bc.t_refresh_pseudo_lsp[level - 1]);
d62a17ae	216	circuit->lsp_regenerate_pending[level - 1] = 0;
f390d2c7	217
99e5d4af	218	memcpy(id, circuit->isis->sysid, ISIS_SYS_ID_LEN);
d62a17ae	219	LSP_PSEUDO_ID(id) = circuit->circuit_id;
	220	LSP_FRAGMENT(id) = 0;
	221	lsp_purge_pseudo(id, circuit, level);
eb5d44eb	222
d62a17ae	223	if (level == 1) {
d62a17ae	224	memset(circuit->u.bc.l1_desig_is, 0, ISIS_SYS_ID_LEN + 1);
f390d2c7	225
907a2395 DS	226	event_add_timer(master, send_l1_psnp, circuit,
	227	isis_jitter(circuit->psnp_interval[level - 1],
	228	PSNP_JITTER),
	229	&circuit->t_send_psnp[0]);
d62a17ae	230	} else {
d62a17ae	231	memset(circuit->u.bc.l2_desig_is, 0, ISIS_SYS_ID_LEN + 1);
f390d2c7	232
907a2395 DS	233	event_add_timer(master, send_l2_psnp, circuit,
	234	isis_jitter(circuit->psnp_interval[level - 1],
	235	PSNP_JITTER),
	236	&circuit->t_send_psnp[1]);
d62a17ae	237	}
f390d2c7	238
e16d030c	239	EVENT_OFF(circuit->t_send_csnp[level - 1]);
7c4f7aab	240
907a2395 DS	241	event_add_timer(master, isis_run_dr, &circuit->level_arg[level - 1],
	242	2 * circuit->hello_interval[level - 1],
	243	&circuit->u.bc.t_run_dr[level - 1]);
7c4f7aab CF	244
7c4f7aab CF	245
907a2395	246	event_add_event(master, isis_event_dis_status_change, circuit, 0, NULL);
eb5d44eb	247
d62a17ae	248	return ISIS_OK;
eb5d44eb	249	}
eb5d44eb	250
d62a17ae	251	int isis_dr_commence(struct isis_circuit *circuit, int level)
eb5d44eb	252	{
d7c0a89a	253	uint8_t old_dr[ISIS_SYS_ID_LEN + 2];
d62a17ae	254
e740f9c1	255	if (IS_DEBUG_EVENTS)
1f46f33f	256	zlog_debug("%s l%d", __func__, level);
d62a17ae	257
	258	/* Lets keep a pause in DR election */
	259	circuit->u.bc.run_dr_elect[level - 1] = 0;
d62a17ae	260	circuit->u.bc.is_dr[level - 1] = 1;
	261
	262	if (level == 1) {
	263	memcpy(old_dr, circuit->u.bc.l1_desig_is, ISIS_SYS_ID_LEN + 1);
	264	LSP_FRAGMENT(old_dr) = 0;
	265	if (LSP_PSEUDO_ID(old_dr)) {
	266	/* there was a dr elected, purge its LSPs from the db */
	267	lsp_purge_pseudo(old_dr, circuit, level);
	268	}
99e5d4af	269	memcpy(circuit->u.bc.l1_desig_is, circuit->isis->sysid,
eab88f36	270	ISIS_SYS_ID_LEN);
d62a17ae	271	*(circuit->u.bc.l1_desig_is + ISIS_SYS_ID_LEN) =
	272	circuit->circuit_id;
	273
	274	assert(circuit->circuit_id); /* must be non-zero */
d62a17ae	275	lsp_generate_pseudo(circuit, 1);
d62a17ae	276
907a2395 DS	277	event_add_timer(master, send_l1_csnp, circuit,
	278	isis_jitter(circuit->csnp_interval[level - 1],
	279	CSNP_JITTER),
	280	&circuit->t_send_csnp[0]);
d62a17ae	281
	282	} else {
	283	memcpy(old_dr, circuit->u.bc.l2_desig_is, ISIS_SYS_ID_LEN + 1);
	284	LSP_FRAGMENT(old_dr) = 0;
	285	if (LSP_PSEUDO_ID(old_dr)) {
	286	/* there was a dr elected, purge its LSPs from the db */
	287	lsp_purge_pseudo(old_dr, circuit, level);
	288	}
99e5d4af	289	memcpy(circuit->u.bc.l2_desig_is, circuit->isis->sysid,
eab88f36	290	ISIS_SYS_ID_LEN);
d62a17ae	291	*(circuit->u.bc.l2_desig_is + ISIS_SYS_ID_LEN) =
	292	circuit->circuit_id;
	293
	294	assert(circuit->circuit_id); /* must be non-zero */
d62a17ae	295	lsp_generate_pseudo(circuit, 2);
d62a17ae	296
907a2395 DS	297	event_add_timer(master, send_l2_csnp, circuit,
	298	isis_jitter(circuit->csnp_interval[level - 1],
	299	CSNP_JITTER),
	300	&circuit->t_send_csnp[1]);
f390d2c7	301	}
eb5d44eb	302
907a2395 DS	303	event_add_timer(master, isis_run_dr, &circuit->level_arg[level - 1],
	304	2 * circuit->hello_interval[level - 1],
	305	&circuit->u.bc.t_run_dr[level - 1]);
	306	event_add_event(master, isis_event_dis_status_change, circuit, 0, NULL);
f390d2c7	307
d62a17ae	308	return ISIS_OK;
eb5d44eb	309	}