From: John Underhill (stepnwlf@magma.ca)
Date: Sun Jun 20 2004 - 04:15:23 GMT-3
Not on my routers/IOS.. but the best tool at your disposal for investigating
command options is always.. '?'
----- Original Message -----
From: "Yasser Aly" <yasser.aly@noorgroup.net>
To: "'John Underhill'" <stepnwlf@magma.ca>; "'Varghese Thomas'"
<vnthomas2@hotmail.com>; <ccielab@groupstudy.com>
Sent: Sunday, June 20, 2004 2:24 AM
Subject: RE: BGP Dampening question
> Hi John,
>
> Thanx for your mail. I agree with you that there is no need to control
the
> penalty value, as it is just the mathematical "constant" used by other
> variables to obtain a value. However, there is no need to do many
> unreasonable asked tasks in the lab also :). It might comes to ones mind
> that this constant that can be set to other value than the default one.
>
> So to conclude you are saying that there is no command to change the
penalty
> cost value.
>
> Thanks for your feedback.
> Yasser
>
> -----Original Message-----
> From: John Underhill [mailto:stepnwlf@magma.ca]
> Sent: Sunday, June 20, 2004 3:46 AM
> To: Yasser Aly; 'Varghese Thomas'; ccielab@groupstudy.com
> Subject: Re: BGP Dampening question
>
> Let me clarify: The penalty applied to a route flap is a constant value of
> 1000. You can control the number of times the route is allowed to
vacillate
> between states by configuring the suppress limit, i.e. if you set the
> supress limit to 3000, three flaps in quick succession, will create a
> cumulative penalty of 3000 and will cause the route to be suppressed.
> Penalty values decrease via an internal timer which reduces the
accumulated
> penalty every 5 seconds to a ratio that equals the half life value. ex.
> penalty = 1000, half life 15min, so it will reduce the penalty by half in
15
> minutes in 5 second cycles = reduction of penalty by 2.7 points per 5
second
> cycle.
> The half life value controls the supress timer, the shorter the half life,
> the faster the penalty value is reduced.
> Reuse limit is just that, when the penalty value has been reduced to this
> amount, the route will be unsuppressed.
> Maximum suppress limit is the maximum amount of time that the route can
> remain suppressed and defaults to four times the half life.
> So you can see, that there is no real need to control the penalty value,
as
> it is just the mathematical 'constant' used by other variables to obtain a
> value.
>
> ----- Original Message -----
> From: "Yasser Aly" <yasser.aly@noorgroup.net>
> To: "'John Underhill'" <stepnwlf@magma.ca>; "'Varghese Thomas'"
> <vnthomas2@hotmail.com>; <ccielab@groupstudy.com>
> Sent: Saturday, June 19, 2004 5:08 PM
> Subject: RE: BGP Dampening question
>
>
> > Hi John,
> >
> > I didn't know that by changing the suppress and unsuppress limit the
> flap
> > constant will be manipulated.
> > I was reviewing the bgp dampening command and it just crossed my mind
> > whether there is a way to change the flap constant value by itself.
> >
> > Thanks for your answer.
> > Yasser
> >
> > -----Original Message-----
> > From: nobody@groupstudy.com [mailto:nobody@groupstudy.com] On Behalf Of
> John
> > Underhill
> > Sent: Saturday, June 19, 2004 9:38 PM
> > To: Varghese Thomas; Yasser Aly; ccielab@groupstudy.com
> > Subject: Re: BGP Dampening question
> >
> > By changing suppress and unsuppress limits, you are manipulating the
flap
> > constant, so where is the need to change that value?
> >
> > ----- Original Message -----
> > From: "Varghese Thomas" <vnthomas2@hotmail.com>
> > To: "Yasser Aly" <yasser.aly@noorgroup.net>; <ccielab@groupstudy.com>
> > Sent: Saturday, June 19, 2004 12:50 PM
> > Subject: Re: BGP Dampening question
> >
> >
> > > Hello,
> > >
> > > It does not.
> > >
> > > By the way, the penalty for attribute is only 500.
> > >
> > > Tx n RD
> > > ----- Original Message -----
> > > From: Yasser Aly
> > > To: ccielab@groupstudy.com
> > > Sent: Saturday, June 19, 2004 5:07 AM
> > > Subject: BGP Dampening question
> > >
> > >
> > > Hello,
> > >
> > > The bgp dampening command sets the half-life, un-suppress limit,
> > > suppress-limit, and the max-time to suppress a route.
> > > Is there a way to change the default cost per flap (1000) in bgp
> > dampening
> > > ?.
> > >
> > > Regards,
> > > Yasser
> > >
> > >
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> > >
> > >
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