09-18-2007 12:29 PM - edited 03-05-2019 06:33 PM
Hello,
Can someone please help. I am seeing that on all my switches the ospf route change the time is 03:53:12. Why this change? is this normal?
O 142.101.0.188/30 [110/4] via 142.101.0.74, 03:53:12, GigabitEthernet2/5
[110/4] via 142.101.0.186, 03:53:12, GigabitEthernet2/8
O 142.101.176.0/24 [110/103] via 142.101.0.1, 03:53:12, GigabitEthernet5/1
O 142.101.0.176/30 [110/5] via 142.101.0.17, 03:53:12, POS1/0/0
O 142.101.0.180/30 [110/8] via 142.101.0.74, 03:53:12, GigabitEthernet3/13
[110/8] via 142.101.0.17, 03:53:12, POS1/0/0
Thanks.
Chris
09-18-2007 12:54 PM
Chris,
You can run the following command to find out more about what triggered SPF execution.
show ip ospf statistics detail
Hope this helps,
09-18-2007 04:11 PM
Hi hritter,
this is the output for show ip ospf statistics detail. This shows me that there's change at 09:42. Is this because there changes on the two router?
SPF 909 executed 09:42:17 ago, SPF type Full
SPF calculation time (in msec):
SPT Intra D-Intr Summ D-Summ Ext7 D-Ext7 Total
0 0 0 0 0 0 0 0
LSIDs processed R:33 N:6 Stub:183 SN:3 SA:0 X7:0
Change record R,
LSIDs changed 4
Last 10 LSIDs:
142.101.5.2(R) 142.101.5.5(R) 142.101.5.2(R) 142.101.5.5(R)
Summary OSPF SPF statistic
SPF calculation time
Delta T Intra D-Intra Summ D-Summ Ext D-Ext Total Reason
6d00h 0 0 0 0 0 0 0 R,
6d00h 0 0 0 0 0 0 0 R,
5d05h 0 0 0 0 0 0 0 R,
5d05h 0 0 0 0 0 0 0 R,
5d04h 0 0 0 0 0 0 0 R,
5d04h 0 0 0 0 0 0 0 R,
5d04h 0 0 0 0 0 0 0 R,
5d04h 0 0 0 0 0 0 0 R,
09:42:27 0 0 4 0 0 0 4 R,
09:42:17 0 0 0 0 0 0 0 R,
09-18-2007 06:56 PM
Chris,
The SPF was indeed triggered by a change in the router LSA for these two routers. Most probably the adjacency status changed on a link between the two routers.
A show log will probably tell you more.
Regards,
09-18-2007 07:00 PM
Yes, it's normal. By design LSAs are refreshed every 3600 seconds.
09-18-2007 07:11 PM
Edison,
The LSA refresh doesn't trigger the SPF if nothing has changed in that LSA.
Regards,
09-18-2007 07:23 PM
Harold
Stand corrected.
Thanks
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