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isisd: delay lsp regeneration while events are still coming in

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When there is a stream of events coming in, where IS-IS learns
about a lot of updates, IS-IS would regenerate its LSPs before
the updates have been processed completely.

This causes suboptimal convergence because the intermediate state
will be flooded. Only after the configured `lsp_gen_interval`, a
new update with the correct and final state will be generated.

Resolve this by holding off LSP generation while there are still
events coming in.

Signed-off-by: Christian Franke <chris@opensourcerouting.org>
This commit is contained in:
Christian Franke 2018-10-24 07:19:22 +02:00
parent 9196731f9d
commit f93025e1a6
3 changed files with 19 additions and 5 deletions
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17
isisd/isis_lsp.c
View File

@ -1361,6 +1361,14 @@ static int lsp_refresh(struct thread *thread)
if ((area->is_type & level) == 0)
return ISIS_ERROR;
if (monotime_since(&area->last_lsp_refresh_event[level - 1], NULL) < 50000L) {
sched_debug("ISIS (%s): Still unstable, postpone LSP L%d refresh",
area->area_tag, level);
_lsp_regenerate_schedule(area, level, 0, false,
__func__, __FILE__, __LINE__);
return 0;
}
sched_debug(
"ISIS (%s): LSP L%d refresh timer expired. Refreshing LSP...",
area->area_tag, level);
@ -1368,8 +1376,9 @@ static int lsp_refresh(struct thread *thread)
}
int _lsp_regenerate_schedule(struct isis_area *area, int level,
int all_pseudo, const char *func,
const char *file, int line)
int all_pseudo, bool postpone,
const char *func, const char *file,
int line)
{
struct isis_lsp *lsp;
uint8_t id[ISIS_SYS_ID_LEN + 2];
@ -1397,6 +1406,10 @@ int _lsp_regenerate_schedule(struct isis_area *area, int level,
if (!((level & lvl) && (area->is_type & lvl)))
continue;
if (postpone) {
monotime(&area->last_lsp_refresh_event[lvl - 1]);
}
sched_debug(
"ISIS (%s): Checking whether L%d needs to be scheduled",
area->area_tag, lvl);

6
isisd/isis_lsp.h
View File

@ -55,11 +55,11 @@ int lsp_tick(struct thread *thread);
int lsp_generate(struct isis_area *area, int level);
#define lsp_regenerate_schedule(area, level, all_pseudo) \
_lsp_regenerate_schedule((area), (level), (all_pseudo), \
_lsp_regenerate_schedule((area), (level), (all_pseudo), true, \
__func__, __FILE__, __LINE__)
int _lsp_regenerate_schedule(struct isis_area *area, int level,
int all_pseudo, const char *func,
const char *file, int line);
int all_pseudo, bool postpone,
const char *func, const char *file, int line);
int lsp_generate_pseudo(struct isis_circuit *circuit, int level);
int lsp_regenerate_schedule_pseudo(struct isis_circuit *circuit, int level);

1
isisd/isisd.h
View File

@ -105,6 +105,7 @@ struct isis_area {
struct flags flags;
struct thread *t_tick; /* LSP walker */
struct thread *t_lsp_refresh[ISIS_LEVELS];
struct timeval last_lsp_refresh_event[ISIS_LEVELS];
/* t_lsp_refresh is used in two ways:
* a) regular refresh of LSPs
* b) (possibly throttled) updates to LSPs