From: Yasser Aly (yasser.aly@noorgroup.net)
Date: Sun Jun 20 2004 - 03:24:03 GMT-3
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
> >
> >
This archive was generated by hypermail 2.1.4 : Sat Jul 03 2004 - 19:40:44 GMT-3