From: Leigh Harrison (ccileigh@gmail.com)
Date: Mon Oct 24 2005 - 17:47:17 GMT-3
Charles,
Funny you should ask that - I don't think so.
I asked the same question not so long back. When you think about it -
every other number is configurable, so it doesn't need to be.
LH
ccahoon@maine.rr.com wrote:
>Hi Leigh, Thanks for the help, I think I'm getting it.
>
>
>You said something very interesting in you note "The default penalty for a
>flap is 1000" can this be changed?
>
>
>
>Original Message:
>-----------------
>From: Leigh Harrison ccileigh@gmail.com
>Date: Mon, 24 Oct 2005 21:13:58 +0100
>To: ccahoon@maine.rr.com, ccielab@groupstudy.com
>Subject: Re: Route Dampening
>
>
>Hey Charles,
>
>The half life is the time in which it will cut it's penalty number in half.
>
>It'll then reuse when you tell it what number to reuse at (the reuse
>threshold)
>
>The max surpress is when it gives it a second chance, regardless of the
>number of the penalty.
>
>The default panalty for a flap is 1000.
>
>dampening HL RT ST MS
>
>HL = half life
>RT = reuse threshold
>ST = supress threshold
>MS = mas surpress
>
>if you wanted to take the link out of routing for 5 flaps in 30 seconds,
>then you would put the half-life to 30 seconds (or more) and put yout
>surpress threshold to 5000 (or lower).
>
>When you get your 5 flaps - you penalty hits 5000 dropping the link out
>of play. You then need to think about when you want him back in and
>that's where the tuning of the half-line ans the reuse threshold come in.
>
>The max surpress is used if you get 10 flaps in the first 5 seconds for
>example. It may sopt flapping after that, but may take ages to come
>back under the reuse threshold - the max-surpress would bail him out
>after x seconds.
>
>For interfaces the values are in seconds, but for bgp dampening it is in
>minutes.
>
>There is a good diagram here:-
>http://www.cisco.com/univercd/cc/td/doc/product/software/ios122s/122snwft/re
>lease/122s14/fsipevdp.htm
>
>Hope this helps a bit - to get my head around it, I worte a spreadsheet
>to emulate the graph on the website above (yeah, sad, I know) and had a
>fiddle with the numbers.
>
>LH
>
>Charles Cahoon wrote:
>
>
>
>>Looking for a simple explanation,
>>
>>I have read a great deal about how to dampen but it's not getting any
>>
>>
>clearer
>
>
>>for me. I was hoping that someone can help.
>>
>>My question is if I want to remove a route if it flaps 5 times in 30
>>
>>
>seconds?
>
>
>>Using the "Half-Life, Suppress Threshold, Reuse Threshold and Maximum
>>
>>
>Suppress
>
>
>>time" not sure these correlate, what am I missing?
>>
>>Thanks for the help
>>
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