RE: OSPF SPF timer and interface dampening

Abiola,

If this is your question, you can certainly adjust your SPF calculations
to meet your requirements during an instability period. For instance you
can delay the kick off time of your SPF when "something" happens.

This feature is called "SPF Throttling" and since IOS 12.2(15)T was a
part of non-S IOS series.

Here is the command : timers throttle spf.....

I would not recommend that you mess with your SPF settings unless you
get Cisco TAC involved.

http://www.cisco.com/en/US/docs/ios/iproute_ospf/configuration/guide/iro
_short_path_ps6441_TSD_Products_Configuration_Guide_Chapter.html#wp10542
99

HTH

--------------------------
Kambiz Agahian
CCIE (R&S), CCSI, WAASSE, RSSSE
Technical Instructor
CCBOOTCAMP - Cisco Learning Solutions Partner (CLSP)
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-----Original Message-----
From: nobody_at_groupstudy.com [mailto:nobody_at_groupstudy.com] On Behalf Of
Abiola Jewoola
Sent: Monday, May 03, 2010 11:03 PM
To: Petr Lapukhov; Joe Astorino
Cc: christopher hernandez; ccielab_at_groupstudy.com
Subject: Re: OSPF SPF timer and interface dampening

Nice article guys!

But what about preventing spf calculations like Chris asked

Regards
Abiola

--- On Mon, 5/3/10, Joe Astorino <jastorino_at_ipexpert.com> wrote:

From: Joe Astorino <jastorino_at_ipexpert.com>
Subject: Re: OSPF SPF timer and interface dampening
To: "Petr Lapukhov" <petr_at_internetworkexpert.com>
Cc: "christopher hernandez" <chrish711_at_gmail.com>,
ccielab_at_groupstudy.com
Date: Monday, May 3, 2010, 7:19 PM

Our latest blog on IP Event Dampening may also be of some use to you
Chris : ) I hope it can help shed some light on the topic along with
Petr's article! I prefer to think about it using 7th grade math
though...
http://blog.ipexpert.com/2010/04/19/ip-event-dampening-using-7th-grade-m
ath/

On Mon, May 3, 2010 at 9:53 PM, Petr Lapukhov
<petr_at_internetworkexpert.com> wrote:
> Hi,
>
> Thinking about your question I came with a quick blog post that
> provides some reasoning behid half-time time selection and event
> dampening as a whole.
>
> http://blog.ine.com/2010/05/03/optimizing-ip-event-dampening/
>
> HTH :)
>
> --
> Petr Lapukhov, petr_at_INE.com
> CCIE #16379 (R&S/Security/SP/Voice)
>
> Internetwork Expert, Inc.
> http://www.INE.com
>
> 2010/4/30 christopher hernandez <chrish711_at_gmail.com>:
>> There is an interface that is constantly flapping. I would like to
configure
>> dampenning in that interface in a way to avoid SPF calculations.
Could
>> someone please provide the correct dampening configuration to
accomplish
>> that and why? (half, resuse, suppress limit, max time, etc).
>>
>>
>> Thanks a lot for your help,
>>
>> chris
>>
>>
>> Blogs and organic groups at http://www.ccie.net
>>
>>
Received on Mon May 03 2010 - 23:28:28 ART