From: Keane, James (James.Keane@agriculture.gov.ie)
Date: Tue Jun 21 2005 - 05:47:12 GMT-3
>but, i don't see any configurable penalty value here or in the literature.
>i.e. - 1 flap = X value is there a default penalty value for a flap?
The default is 1000 and it is NOT configurable,
but think about it ... why should it be, you can configure every other value !
Read the mail I sent - I thought I explained it pretty well(awaiting onslaught from the gurus)
Try giving yourself 3 or 4 questions and working them out, its a piece of cake !
Mail to Sheikh Rahman
http://www.cisco.com/univercd/cc/td/doc/product/software/ios122/122newft/122t/122t13/ftipevdp.htm
you have to remember that dampening is completely linked to time. In as brief as I can ..
When a link flaps, it creates a penalty of 1000 (default value)
If is exceeds the 'supress-threshold' WITHIN its 'half-life period' then the link is 'dampened'
every half life the penalty is reduced by half, if the penalty is less than the re-use threshold
then the link is 'unsupressed'
If the 'maximum supress time' is exceeded the link unsupressed.
So
>> For example I want interface to be in dampening state after 5 flap.
we shall add 'within a minute' to that !
Then
int fast 0/0
dampening 60 3000 4999 240
(Half-life 60, Reuse Threshold 3000, Supress-Threshold 4999, Maximum Suppress time 240)
So if it flaps 5 times within 60 seconds, then its penalty will be 5000, which is greater than 4999 and the link is supressed, if there is no more flaps, another hlaf life goes by and the penalty is reduced by half to now 2500, so the link is now under the 3000 'reuse threshold' and the link is unsupressed
Regards
James
-----Original Message-----
From: John Matus [mailto:john_matus@hotmail.com]
Sent: 20 June 2005 23:32
To: ccie2be@nyc.rr.com; ccielab@groupstudy.com
Subject: RE: ip event dampening
hmm. interesting...perhaps you know this then, does a max-reuse interval
of 255 mean that there is no maximum time for the interface to stay
suppressed, ergo the interface could be suppressed indefinitely?
>From: "ccie2be" <ccie2be@nyc.rr.com>
>To: "'John Matus'" <john_matus@hotmail.com>, <ccielab@groupstudy.com>
>Subject: RE: ip event dampening
>Date: Mon, 20 Jun 2005 18:27:04 -0400
>
>It's 1000, by default.
>
>If you look under the new features listing in 12.3 you'll find a write up
>on
>it. That, I recall, has more detail than the command reference.
>
>Tim
>
>-----Original Message-----
>From: nobody@groupstudy.com [mailto:nobody@groupstudy.com] On Behalf Of
>John
>Matus
>Sent: Monday, June 20, 2005 6:18 PM
>To: ccielab@groupstudy.com
>Subject: ip event dampening
>
>i'm a bit confused about interface dampening. it appears that the defaults
>are:
>half-life 15
>resuse 1000
>suppress 2000
>max supress 60
>
>but, i don't see any configurable penalty value here or in the literature.
>i.e. - 1 flap = X value
>is there a default penalty value for a flap?
>
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