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OSPF Statistics command - clarification

Dear All,

I have doubts on sh ip ospf statistics command output, I have executed this command in one of our router and got below output.

--------------------------

Area 0.0.0.0: SPF algorithm executed 191173 times

Summary OSPF SPF statistic

SPF calculation time

Delta T Intra D-Intra Summ D-Summ Ext D-Ext Total Reason

6d02h 4 4 0 0 48 0 56 R, N, SN, X

6d02h 4 0 4 0 48 0 56 R, N, X

6d02h 4 0 4 0 48 0 56 R, SN, X

5d01h 4 0 4 0 48 0 56 R, SN, X

5d01h 4 0 4 0 48 0 56 R, N, X

5d01h 16 0 0 0 96 0 120 R, N, SN, X

3d00h 8 0 0 0 48 4 60 R, N, SN, X

3d00h 8 0 0 0 48 0 56 R, N, SN, X

3d00h 4 0 4 0 48 0 56 R, N, X

3d00h 4 0 4 0 48 0 56 R, N, X

----------------------------------

While seeing the output delta, Intra, D-Intra, Sum, D-sum, Ext, D-Ext, Total and reson feilds. Not sure what is the meaning of these feilds and how would we know whether SPF calculation is happening frequently and which routes are getting flapped.

kindly share your inputs in this regard, appriciate any links to clarify these points.

Regards,

Gopal

1 REPLY

Re: OSPF Statistics command - clarification

Gopal,

The link below explains all the different fields for you in the 'show ip ospf statistics' command. This should address most of your queries.

Command lookup tool is your best friend to interpret different values and parameters for all IOS commands. I highly recommend using this tool for any command related questions.

http://www.cisco.com/en/US/docs/ios/12_3t/ip_route/command/reference/ip2_s4gt.html#wp1167148

HTH

Sundar

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