The Big Squeeze

Alec H. Peterson ahp at
Mon Mar 3 14:21:12 UTC 1997

On Mar 3, 1997, Erik Sherk wrote:
> Sean has a good point here. A flap of a /8 is the same as a flap of
> a /24 from a computational point of view. There is clearly some
> social engineering going on here. If you want your long prefix to be
> golbally visable and you allow it to flap, then you will be subject
> to dampening. On the other hand if you renumber into a larger
> aggregate, then you are protected from dampening (to a greater
> degree). Kind of a 'carrot and stick' approch. :-)

Computational power required for a route flap is not the issue here.

Many people have stated that, statistically longer prefixes flap
more.  Unfortunately, they have then said that because of this shorter
prefixes should have looser dampening parameters put on them, when
what they really meant was that the longer prefixes should have more
strict dampening parameters put on them.  Yes it is exactly the same
thing, but it is an important semantic distinction.  If a group of
prefixes categorized by a its length tends to flap more than the
average, then said group should have more strict dampening parameters
placed on it.


|Alec Peterson - ahp at    | Erols Internet Services, INC.        |
|Network Engineer                    | Springfield, VA.                     |

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