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zebra: Add a configurable knob zebra nexthop-group keep (1-3600)

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Allow end operator to set how long a nexthop-group is kept around
in the system after it is no-longer being used.

Signed-off-by: Donald Sharp <sharpd@nvidia.com>
This commit is contained in:
Donald Sharp 2022-06-15 19:54:29 -04:00
parent 35729f38fa
commit c9af62e314
5 changed files with 34 additions and 2 deletions
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6
doc/user/zebra.rst
View File

@ -273,6 +273,12 @@ Nexthop tracking doesn't resolve nexthops via the default route by default.
Allowing this might be useful when e.g. you want to allow BGP to peer across
the default route.
.. clicmd:: zebra nexthop-group keep (1-3600)
Set the time that zebra will keep a created and installed nexthop group
before removing it from the system if the nexthop group is no longer
being used. The default time is 180 seconds.
.. clicmd:: ip nht resolve-via-default
Allow IPv4 nexthop tracking to resolve via the default route. This parameter

4
zebra/zebra_nhg.c
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@ -1649,8 +1649,8 @@ void zebra_nhg_decrement_ref(struct nhg_hash_entry *nhe)
!CHECK_FLAG(nhe->flags, NEXTHOP_GROUP_KEEP_AROUND)) {
nhe->refcnt = 1;
SET_FLAG(nhe->flags, NEXTHOP_GROUP_KEEP_AROUND);
thread_add_timer(zrouter.master, zebra_nhg_timer, nhe, 180,
&nhe->timer);
thread_add_timer(zrouter.master, zebra_nhg_timer, nhe,
zrouter.nhg_keep, &nhe->timer);
}
if (!zebra_nhg_depends_is_empty(nhe))

2
zebra/zebra_router.c
View File

@ -278,6 +278,8 @@ void zebra_router_init(bool asic_offload, bool notify_on_ack)
zrouter.packets_to_process = ZEBRA_ZAPI_PACKETS_TO_PROCESS;
zrouter.nhg_keep = ZEBRA_DEFAULT_NHG_KEEP_TIMER;
zebra_vxlan_init();
zebra_mlag_init();

3
zebra/zebra_router.h
View File

@ -219,6 +219,9 @@ struct zebra_router {
bool notify_on_ack;
bool supports_nhgs;
#define ZEBRA_DEFAULT_NHG_KEEP_TIMER 180
uint32_t nhg_keep;
};
#define GRACEFUL_RESTART_TIME 60

21
zebra/zebra_vty.c
View File

@ -3850,11 +3850,31 @@ DEFUN (no_ip_zebra_import_table,
return (zebra_import_table(AFI_IP, VRF_DEFAULT, table_id, 0, NULL, 0));
}
DEFPY (zebra_nexthop_group_keep,
zebra_nexthop_group_keep_cmd,
"[no] zebra nexthop-group keep (1-3600)",
NO_STR
ZEBRA_STR
"Nexthop-Group\n"
"How long to keep\n"
"Time in seconds from 1-3600\n")
{
if (no)
zrouter.nhg_keep = ZEBRA_DEFAULT_NHG_KEEP_TIMER;
else
zrouter.nhg_keep = keep;
return CMD_SUCCESS;
}
static int config_write_protocol(struct vty *vty)
{
if (allow_delete)
vty_out(vty, "allow-external-route-update\n");
if (zrouter.nhg_keep != ZEBRA_DEFAULT_NHG_KEEP_TIMER)
vty_out(vty, "zebra nexthop-group keep %u\n", zrouter.nhg_keep);
if (zrouter.ribq->spec.hold != ZEBRA_RIB_PROCESS_HOLD_TIME)
vty_out(vty, "zebra work-queue %u\n", zrouter.ribq->spec.hold);
@ -4433,6 +4453,7 @@ void zebra_vty_init(void)
install_element(CONFIG_NODE, &ip_multicast_mode_cmd);
install_element(CONFIG_NODE, &no_ip_multicast_mode_cmd);
install_element(CONFIG_NODE, &zebra_nexthop_group_keep_cmd);
install_element(CONFIG_NODE, &ip_zebra_import_table_distance_cmd);
install_element(CONFIG_NODE, &no_ip_zebra_import_table_cmd);
install_element(CONFIG_NODE, &zebra_workqueue_timer_cmd);