From: Venkataramanaiah.R (vramanaiah@gmail.com)
Date: Fri Dec 02 2005 - 16:52:34 GMT-3
> 5 seconds - flap - penalty is increased to 1000
> 8 seconds - flap - penalty is increased to 2000
> 15 seconds - HALF LIFE - penalty decreased to 1000
As far as i understand, the above penalty of 2000 would be reduced to
1000 only at the 23rd ( 15+8 ) second and not at 15 seconds..
-Venkat
On 11/30/05, Anthony Sequeira <terry.francona@gmail.com> wrote:
> I have noticed many questions about this topic lately and I thought I would
> put my two cents in for the group. Comments, critiques, and additions are
> certainly encouraged. I will not, however, hire a temporary employee to help
> field responses. ;-)
>
> You can turn on dampening for an interface participating in RIP, OSPF,
> EIGRP, IS-IS, or BGP and you can track interface "flaps" - having the IOS
> remove the interface from routing if a certain penalty value is reached. The
> values that you can set for this feature include:
>
> Suppress Threshold - value that triggers dampening of the interface - you
> must EXCEED this value to trigger dampening - DEFAULT IS 2000
>
> Half-Life Period - the accumulated penalty is reduced by half each half-life
> period; DEFAULT IS 15 SECONDS
>
> Reuse Threshold - value that triggers the route coming out of dampening;
> DEFAULT IS 1000
>
> Max Suppress Time - max time that a route can be suppressed - DEFAULT IS 60
> SECONDS
>
> One value that you can not set is:
>
> Penalty - (this number is not shared with you in the config guide - only the
> command ref) - 1000
>
> So let's say that I want to dampen an interface should it flap 4 times in 45
> seconds....will the default values do this? I do no think so....watch.....
>
> 5 seconds - flap - penalty is increased to 1000
> 8 seconds - flap - penalty is increased to 2000
> 15 seconds - HALF LIFE - penalty decreased to 1000
> 20 seconds - flap - penalty increased to 2000
> 30 seconds - HALF LIFE - penalty decreased to 1000
> 35 seconds - flap - penalty increased to 2000
>
> Notice that we just had our four flaps within 45 seconds - but we never
> exceeded the Suppress Threshold. Decreasing the Suppress Threshold and
> leaving all other values at defaults would do the trick I believe.
>
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