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OSPF External Route Flap

minaketan_19
Level 1
Level 1

Hi Guys,

I have a weird kind of fault. I have a setup of 2 routers few switches and few firewalls. I have 3 OSPF process running between these devices. I am observing only external OSPF routes are getting refreshed after few interval of time. When i check "ip ospf statistics" i can see delta time value to be a few minutes. but t"ip ospf statistics detail" is not showing any recent activity. Below are the output of both commands taken from one of the 6500 switch. Any help on this will be highly appreciated.

ABC#sh ip ospf 100 sta

OSPF Router with ID (10.17.224.198) (Process ID 100)

Area 0: SPF algorithm executed 603 times

Summary OSPF SPF statistic

SPF calculation time
Delta T Intra D-Intra Summ D-Summ Ext D-Ext Total Reason
1d00h 0 0 0 0 269 0 269 X
1d00h 0 0 0 0 269 0 269 X
14:41:07 0 0 0 0 269 0 269 X
14:40:57 0 0 0 0 268 0 268 X
08:22:51 0 0 0 0 269 8 277 X
08:22:40 0 0 0 0 277 0 277 X
08:18:25 0 0 0 0 268 0 268 X
08:18:15 0 0 0 0 277 0 277 X
00:15:25 0 0 0 0 267 0 267 X
00:15:15 0 0 0 0 268 0 268 X

RIB manipulation time during SPF (in msec):
Delta T RIB Update RIB Delete
1d00h 165 0
1d00h 167 0
14:41:07 164 0
14:40:57 167 0
08:22:51 166 0
08:22:40 167 0
08:18:25 165 0
08:18:15 167 0
00:15:25 164 0
00:15:15 168 0

ABC#sh ip ospf 100 sta det

OSPF Router with ID (10.17.224.198) (Process ID 100)

Area 0: SPF algorithm executed 603 times

SPF 594 executed 3d15h ago, SPF type Full
SPF calculation time (in msec):
SPT Intra D-Intr Summ D-Summ Ext7 D-Ext7 Total
0 0 0 8 0 0 0 8
RIB manipulation time (in msec):
RIB Update RIB Delete
0 0
LSIDs processed R:9 N:2 Stub:32 SN:7 SA:5 X7:0
Change record
LSIDs changed 10
Last 10 LSIDs:
10.17.224.195(R) 10.17.224.44(N) 10.17.224.223(R) 10.17.224.221(R)
10.17.224.196(R) 10.17.224.13(N) 10.17.224.195(R) 10.17.224.222(R)
10.17.224.45(N) 10.17.224.29(N)

SPF 595 executed 3d15h 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
RIB manipulation time (in msec):
RIB Update RIB Delete
0 0
LSIDs processed R:9 N:4 Stub:27 SN:7 SA:5 X7:0
Change record
LSIDs changed 5
Last 10 LSIDs:
10.17.224.220(R) 10.17.224.99(N) 10.17.224.195(R) 10.17.224.196(R)
10.17.224.13(N)

SPF 596 executed 3d15h 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
RIB manipulation time (in msec):
RIB Update RIB Delete
0 0
LSIDs processed R:8 N:4 Stub:28 SN:4 SA:2 X7:0
Change record
LSIDs changed 2
Last 10 LSIDs:
10.17.224.193(R) 10.17.224.45(N)

SPF 597 executed 3d15h 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
RIB manipulation time (in msec):
RIB Update RIB Delete
0 0
LSIDs processed R:8 N:4 Stub:29 SN:4 SA:2 X7:0
Change record
LSIDs changed 1
Last 10 LSIDs:
10.17.224.195(R)

SPF 598 executed 3d15h 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
RIB manipulation time (in msec):
RIB Update RIB Delete
0 0
LSIDs processed R:8 N:4 Stub:30 SN:4 SA:2 X7:0
Change record
LSIDs changed 1
Last 10 LSIDs:
10.17.224.198(R)

SPF 599 executed 3d15h 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
RIB manipulation time (in msec):
RIB Update RIB Delete
0 0
LSIDs processed R:8 N:4 Stub:30 SN:5 SA:2 X7:0
Change record
LSIDs changed 3
Last 10 LSIDs:
10.17.224.44(N) 145.224.144.61(R) 10.17.224.45(N)

SPF 600 executed 3d15h ago, SPF type Full
SPF calculation time (in msec):
SPT Intra D-Intr Summ D-Summ Ext7 D-Ext7 Total
0 8 0 0 0 0 0 8
RIB manipulation time (in msec):
RIB Update RIB Delete
4 0
LSIDs processed R:10 N:4 Stub:31 SN:7 SA:3 X7:0
Change record
LSIDs changed 8
Last 10 LSIDs:
10.17.224.198(R) 10.17.224.195(R) 10.17.224.44(N) 10.17.224.194(R)
10.17.224.13(N) 145.224.144.61(R) 10.17.224.194(R) 10.17.224.29(N)

SPF 601 executed 3d15h 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
RIB manipulation time (in msec):
RIB Update RIB Delete
3 0
LSIDs processed R:10 N:4 Stub:30 SN:7 SA:6 X7:0
Change record
LSIDs changed 2
Last 10 LSIDs:
10.17.224.193(R) 10.17.224.13(N)

SPF 602 executed 3d10h ago, SPF type Full
SPF calculation time (in msec):
SPT Intra D-Intr Summ D-Summ Ext7 D-Ext7 Total
0 0 0 8 0 0 0 8
RIB manipulation time (in msec):
RIB Update RIB Delete
3 0
LSIDs processed R:10 N:4 Stub:29 SN:7 SA:7 X7:0
Change record
LSIDs changed 1
Last 10 LSIDs:
10.17.224.220(R)

SPF 603 executed 3d10h ago, SPF type Full
SPF calculation time (in msec):
SPT Intra D-Intr Summ D-Summ Ext7 D-Ext7 Total
0 0 0 8 0 0 0 8
RIB manipulation time (in msec):
RIB Update RIB Delete
3 0
LSIDs processed R:10 N:4 Stub:30 SN:7 SA:7 X7:0
Change record
LSIDs changed 1
Last 10 LSIDs:
10.17.224.220(R)

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