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ospf6d: restart spf when distance is updated

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if r1 has a route received from a neighbor and the same route
configured as static, the administrative distance will determine
which route to use

r1(config)# ipv6 route 1:1::1/128 Null0 70

r1# sh ipv6 route
Codes: K - kernel route, C - connected, S - static, R - RIPng,
       O - OSPFv3, I - IS-IS, B - BGP, N - NHRP, T - Table,
       v - VNC, V - VNC-Direct, A - Babel, F - PBR,
       f - OpenFabric,
       > - selected route, * - FIB route, q - queued, r - rejected, b - backup
       t - trapped, o - offload failure

S>* 1:1::1/128 [70/0] unreachable (blackhole), weight 1, 00:00:12
O   1:1::1/128 [110/20] via fe80::1833:c9ff:fe7b:3e43, r1-r2-eth0, weight 1, 00:00:49

The static route is selected. If we now change the administrative distance
in ospf6, the OSPF route should be selected

r1(config)# router ospf6
r1(config-ospf6)# distance 50

r1# sh ipv6 route
Codes: K - kernel route, C - connected, S - static, R - RIPng,
       O - OSPFv3, I - IS-IS, B - BGP, N - NHRP, T - Table,
       v - VNC, V - VNC-Direct, A - Babel, F - PBR,
       f - OpenFabric,
       > - selected route, * - FIB route, q - queued, r - rejected, b - backup
       t - trapped, o - offload failure

S>* 1:1::1/128 [70/0] unreachable (blackhole), weight 1, 00:00:39
O   1:1::1/128 [110/20] via fe80::1833:c9ff:fe7b:3e43, r1-r2-eth0, weight 1, 00:01:16

However the distance is not applied as there are no changes in the routing table

This commit will force the update of the routing table with the new configured distance

r1# sh ipv6 route
Codes: K - kernel route, C - connected, S - static, R - RIPng,
       O - OSPFv3, I - IS-IS, B - BGP, N - NHRP, T - Table,
       v - VNC, V - VNC-Direct, A - Babel, F - PBR,
       f - OpenFabric,
       > - selected route, * - FIB route, q - queued, r - rejected, b - backup
       t - trapped, o - offload failure

O>* 1:1::1/128 [50/20] via fe80::8cb7:e6ff:fef5:2344, r1-r2-eth0, weight 1, 00:00:03
S   1:1::1/128 [70/0] unreachable (blackhole), weight 1, 00:00:19

Signed-off-by: ckishimo <carles.kishimoto@gmail.com>
This commit is contained in:
ckishimo 2022-01-26 22:41:36 +01:00
parent 457fb2c846
commit fcd45026a2
2 changed files with 12 additions and 4 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

15
ospf6d/ospf6_top.c
View File

@ -971,8 +971,13 @@ DEFUN (ospf6_distance,
"OSPF6 Administrative distance\n")
{
VTY_DECLVAR_CONTEXT(ospf6, o);
uint8_t distance;
o->distance_all = atoi(argv[1]->arg);
distance = atoi(argv[1]->arg);
if (o->distance_all != distance) {
o->distance_all = distance;
ospf6_restart_spf(o);
}
return CMD_SUCCESS;
}
@ -986,8 +991,10 @@ DEFUN (no_ospf6_distance,
{
VTY_DECLVAR_CONTEXT(ospf6, o);
o->distance_all = 0;
if (o->distance_all) {
o->distance_all = 0;
ospf6_restart_spf(o);
}
return CMD_SUCCESS;
}
@ -1237,7 +1244,7 @@ DEFUN (no_ospf6_stub_router_admin,
}
/* Restart OSPF SPF algorithm*/
static void ospf6_restart_spf(struct ospf6 *ospf6)
void ospf6_restart_spf(struct ospf6 *ospf6)
{
ospf6_route_remove_all(ospf6->route_table);
ospf6_route_remove_all(ospf6->brouter_table);

1
ospf6d/ospf6_top.h
View File

@ -251,6 +251,7 @@ extern void install_element_ospf6_clear_process(void);
extern void ospf6_top_init(void);
extern void ospf6_delete(struct ospf6 *o);
extern bool ospf6_router_id_update(struct ospf6 *ospf6, bool init);
void ospf6_restart_spf(struct ospf6 *ospf6);
extern void ospf6_maxage_remove(struct ospf6 *o);
extern struct ospf6 *ospf6_instance_create(const char *name);