From: Anthony Sequeira (terry.francona@gmail.com)
Date: Fri Dec 02 2005 - 18:59:00 GMT-3
Yes - I saw that the half life default is actually 5 seconds.
But I also noticed that the penalty did not appear to be 1000.
Also - I set the half life to 15 seconds - yet the penalty decay had nothing
to do with 15 seconds. It would decay much more rapidly than that.
It almost looks like Cisco is treating an interface shutdown differently
than some other interface failure.
How in the world are we to know how Cisco grades this feature???? I can only
imagine the response I would get from the proctor on this one...."Do what
the question states please. Thanks."
On 12/2/05, Edwards, Andrew M <andrew.m.edwards@boeing.com> wrote:
>
> Anthony,
>
> Hopefully you saw that the deafult is 5 seconds and not 15 seconds as
> documented?
>
> To verify, use the command:
>
> Show interface dampening
>
> Seen on 12.2(15)T and even on 12.3
>
> HTH,
>
> Andy
> CCIE #15334
>
> -----Original Message-----
> From: Anthony Sequeira [mailto:terry.francona@gmail.com]
> Sent: Friday, December 02, 2005 12:27 PM
> To: my-ccie-test@libero.it
> Cc: ccielab@groupstudy.com
> Subject: Re: IP Event Dampening
>
>
> Sad news everyone - I just labbed this up as well using 12.2(15)T16
> code.....NONE of it seems to work as documented.
>
> Indeed the default values are not what is documented....AND - it took me
> like 25 flaps before I could get the interface to dampen. The penalty
> assigned did not appear to be anything close to 1000 - and the penalty
> would decay at a rate much faster than the configured or default Half
> Life.
>
> I only pray that Cisco grades this feature based on the documentation -
> and not on how the feature actually behaves in production.
>
> These are the things that make this journey rather frustrating and at
> times
> - in fact - bordering on ludicrous.
>
>
>
> On 12/2/05, my-ccie-test@libero.it <my-ccie-test@libero.it> wrote:
> >
> > Hi Anthony,
> > I did a lab cheking for this feature and wath I saw is the following:
> >
> > first of all doing the command show interface dampening it shows the
> > default value for half-life time is 5 seconds (not 15..)
> >
> > #sh interfaces dampening
> >
> > ATM0/0
> > Flaps Penalty Supp ReuseTm HalfL ReuseV SuppV MaxSTm MaxP
> > Restart
> >
> > 0 0 FALSE 0 5 1000 2000 20
> > 16000 0
> >
> > #
> >
> > I did a test trying to dampen an interface after 3 flap in 30 seconds.
>
> > the config that I see work was with an half-life of 30 seconds and a
> > suppress-threshold of 2500.
> >
> > I think if you want to dampen an interface after a certain number of
> > flap in a determined time you have to set suppress thresold and also
> > half-life time. wath do you think about ?
> >
> > thanks for any comments
> >
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