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isisd: Add advertise high metrics base functionality

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Implement advertise-high-metrics set function - when advertise-high-metrics is configured, iterate through each isis interface and update each metric to its high metric value. When advertise-high-metrics is disabled, revert each interface's metric to its originally configured value.

Signed-off-by: Isabella de Leon <ideleon@microsoft.com>
This commit is contained in:
Isabella de Leon 2023-01-10 17:58:29 -08:00
parent d74f913c5f
commit 7c47551763
2 changed files with 51 additions and 1 deletions
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4
isisd/isis_circuit.c
View File

@ -1499,6 +1499,10 @@ ferr_r isis_circuit_metric_set(struct isis_circuit *circuit, int level,
return ferr_cfg_invalid("metric %d too large for narrow metric",
metric);
/* Don't modify metric if advertise high metrics is configured */
if (circuit->area && circuit->area->advertise_high_metrics)
return ferr_ok();
/* inform ldp-sync of metric change
* if ldp-sync is running need to save metric
* and restore new values after ldp-sync completion.

48
isisd/isisd.c
View File

@ -3253,7 +3253,53 @@ void config_end_lsp_generate(struct isis_area *area)
void isis_area_advertise_high_metrics_set(struct isis_area *area,
bool advertise_high_metrics)
{
/* TODO */
struct listnode *node;
struct isis_circuit *circuit;
int max_metric;
char xpath[XPATH_MAXLEN];
struct lyd_node *dnode;
int configured_metric_l1;
int configured_metric_l2;
if (area->advertise_high_metrics == advertise_high_metrics)
return;
if (advertise_high_metrics) {
if (area->oldmetric && area->newmetric)
max_metric = ISIS_NARROW_METRIC_INFINITY;
else if (area->newmetric)
max_metric = MAX_WIDE_LINK_METRIC;
else
max_metric = MAX_NARROW_LINK_METRIC;
for (ALL_LIST_ELEMENTS_RO(area->circuit_list, node, circuit)) {
isis_circuit_metric_set(circuit, IS_LEVEL_1,
max_metric);
isis_circuit_metric_set(circuit, IS_LEVEL_2,
max_metric);
}
area->advertise_high_metrics = true;
} else {
area->advertise_high_metrics = false;
for (ALL_LIST_ELEMENTS_RO(area->circuit_list, node, circuit)) {
/* Get configured metric */
snprintf(xpath, XPATH_MAXLEN,
"/frr-interface:lib/interface[name='%s']",
circuit->interface->name);
dnode = yang_dnode_get(running_config->dnode, xpath);
configured_metric_l1 = yang_dnode_get_uint32(
dnode, "./frr-isisd:isis/metric/level-1");
configured_metric_l2 = yang_dnode_get_uint32(
dnode, "./frr-isisd:isis/metric/level-2");
isis_circuit_metric_set(circuit, IS_LEVEL_1,
configured_metric_l1);
isis_circuit_metric_set(circuit, IS_LEVEL_2,
configured_metric_l2);
}
}
}
/*