OSPF

Unanswered Question
Sep 18th, 2007
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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

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Harold Ritter Tue, 09/18/2007 - 12:54
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Chris,


You can run the following command to find out more about what triggered SPF execution.


show ip ospf statistics detail


Hope this helps,

cmain0238 Tue, 09/18/2007 - 16:11
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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,

Harold Ritter Tue, 09/18/2007 - 18:56
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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,

Harold Ritter Tue, 09/18/2007 - 19:11
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Edison,


The LSA refresh doesn't trigger the SPF if nothing has changed in that LSA.


Regards,

Edison Ortiz Tue, 09/18/2007 - 19:23
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Harold


Stand corrected.


Thanks

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