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New Member

OSPF

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

6 REPLIES
Cisco Employee

Re: OSPF

Chris,

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

show ip ospf statistics detail

Hope this helps,

Harold Ritter
Sr. Technical Leader
CCIE 4168 (R&S, SP)
harold@cisco.com
México móvil: +52 1 55 8312 4915
Cisco México 
Paseo de la Reforma 222 Piso 19
Cuauhtémoc, Juárez
Ciudad de México, 06600
México
New Member

Re: OSPF

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,

Cisco Employee

Re: OSPF

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
Sr. Technical Leader
CCIE 4168 (R&S, SP)
harold@cisco.com
México móvil: +52 1 55 8312 4915
Cisco México 
Paseo de la Reforma 222 Piso 19
Cuauhtémoc, Juárez
Ciudad de México, 06600
México
Hall of Fame Super Bronze

Re: OSPF

Cisco Employee

Re: OSPF

Edison,

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

Regards,

Harold Ritter
Sr. Technical Leader
CCIE 4168 (R&S, SP)
harold@cisco.com
México móvil: +52 1 55 8312 4915
Cisco México 
Paseo de la Reforma 222 Piso 19
Cuauhtémoc, Juárez
Ciudad de México, 06600
México
Hall of Fame Super Bronze

Re: OSPF

Harold

Stand corrected.

Thanks

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