Re: BGP Dampening

Is that the decay time though or the penalty? I had a question in an
INE Poly Lab recently about making the decay time equal 5 minutes. I
couldnt find anything in the Cisco documentation about how this is
calculated.

Apparently it is based off the half-life and/or max-suppress values
though. I am yet to test this but when I get a chance I will confirm.

R3(config-router)#bgp damp 7 750 2000 15
R3(config-router)#do sh ip bgp d p
 dampening 7 750 2000 15
  Half-life time : 7 mins Decay Time : 300 secs
  Max suppress penalty: 3310 Max suppress time: 15 mins
  Suppress penalty : 2000 Reuse penalty : 750

If anyone has info on this please reference it for us thanks!

On Tue, 2009-04-14 at 18:58 -0300, Alberto Santos wrote:
> hey there,
>
> here is how the Penalty is calculated.
>
> penalty(t2) = penalty(t1) * e(-(t2 - t1) * ln2 / half-life)
> max-penalty = reuse-limit * 2 (max-suppress-time/half-life)
>
> BR
>
> Alberto
>
> 2009/4/14 Cisco Fanatic <ebay_products_at_hotmail.com>
>
> > All,
> >
> > How is Decay Time calculated? Is there any formula to calculate Decay Time?
> >
> > R3#sh ip bgp dampening par
> > dampening 30 750 2000 120
> > Half-life time : 30 mins Decay Time : 4645 secs
> > Max suppress penalty: 12000 Max suppress time: 120 mins
> > Suppress penalty : 2000 Reuse penalty : 750
> >
> >
> > Half-life time, Suppress penalty, Reuse penalty are Configurable.
> > Max suppress penalty & Max suppress time are Maximum.
> >
> > -Yuri
> >
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Received on Wed Apr 15 2009 - 13:27:40 ART