RE: OSPF Performance

- How can I relate values needed from show ip ospf statistics to values needed
i throttle:?
output of show ip ospf statistic(where should I look at exactly) SPF
calculation timeDelta T Intra D-Intra Summ D-Summ Ext D-Ext Total
Reason00:10:10 0 0 0 0 0 0 0 R, 00:08:56 0 0 0 0 0 0 0 R, N,

- if I used dampening only with no values, what the default it will take?
thanks

> Date: Sat, 22 May 2010 09:52:02 +0000
> From: joe_astorino_at_comcast.net
> To: hussamkibbi_at_hotmail.com
> CC: ccielab_at_groupstudy.com
> Subject: Re: OSPF Performance
>
> Well, you can use "show ip ospf statistics" to figure out how many times
things have flapped in some amount of time. The statistics you gather from
that effectively tell you the frequency of your flaps, which you can then use
to calculate things like the start, increment and max_wait.
>
> throttling SPF does ONLY that though -- it delays the running of SPF.
However, it has a similar IDEA as IP event dampening. The difference is with
throttling you are delaying the SPF from happening. With dampening you are
preventing instability by suppressing the advertisements of LSAs when things
are flapping. Both use the same principal of how long to do that for (using
exponential decay).
>
> So, to answer your second question it depends on what you want to do or what
you are told to do. Do you want to delay SPF calculations during flaps, or do
you want to prevent interfaces/networks from being advertised at all during
flaps, or both?
>
> HTH
>
> Regards,
> Joe Astorino, CCIE #24347
>
> "He not busy being born is busy dying" -- Dylan
>
> ----- Original Message -----
> From: "Hussam EL Kebbi" <hussamkibbi_at_hotmail.com>
> To: ccielab_at_groupstudy.com
> Sent: Saturday, May 22, 2010 5:26:14 AM GMT -05:00 US/Canada Eastern
> Subject: OSPF Performance
>
> Experts,
> According to ine bog:
http://blog.ine.com/2009/12/31/tuning-ospf-performance/
> timers throttle spf start increment max_wait:is used when dynamic adaptation
> to unstable network topologies.
> 1 - How can we reflect the unstable network topologies timers (in throttle
> timers)?for example using: show ip ospf statistics? if so how can we relate
> output value to timers so we need to put in timers throttle?
> 2- It says also dampening would suppress events while throttling simply
> increases the response times:
> Do we need to use them together?
> Thanks
>
>
>
> _________________________________________________________________
> Hotmail is redefining busy with tools for the New Busy. Get more from your
> inbox.
>
http://www.windowslive.com/campaign/thenewbusy?ocid=PID28326::T:WLMTAGL:ON:WL
> :en-US:WM_HMP:042010_2
>
>
> Blogs and organic groups at http://www.ccie.net
>
> _______________________________________________________________________
> Subscription information may be found at:
> http://www.groupstudy.com/list/CCIELab.html
>
>
> Blogs and organic groups at http://www.ccie.net
>
> _______________________________________________________________________
> Subscription information may be found at:
> http://www.groupstudy.com/list/CCIELab.html
>
>
>
>
>
>
>
Received on Sat May 22 2010 - 11:18:33 ART