Re: BGP Dampening

you can calc both time or penalty using penalty(t2) formula.

to find what would be the penalty in 5 min for example, you can use excel
to easily know the penalty(penalty(t2)) value and to find the the time(t2)
a HP would nice ;)

br

Alberto

2009/4/15 Tom Harbert <thomas.harbert_at_gmail.com>

> 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 - 10:45:00 ART