Route flapping is simply a route that keeps going up and down. Regardless
of routing protocol, participating routers will continuously have to update
their routing tables to account for the changes. If the route doesn't
stabilize, this can seriously affect the CPU usage levels on your routers,
depending on your choice of routing protocol and the size of your routing
table.
Specifically regarding convergence, route flapping will not allow the
network to truly converge since it's in a constant state of flux. You must
find ways to deal with this or your network could become quite unstable when
routes start flapping. This really depends on several factors, but you get
the idea. I hope that clears things up a little bit.
John Neiberger, CCNA/CCDA
>
> Marco-
>
> I never came across this terminology either until I was reading some
notes
> on the sitamoht website. This an excerpt from the sitamoht site....
> Route dampening is a BGP feature designed to minimize the propagation of
> flapping routes across an internetwork. A route is considered to be
flapping
> when it is repeatedly available, then unavailable, then available, then
> unavailable, and so on.
> A route that is flapping receives a penalty of 1000 for each flap. When
the
> accumulated penalty reaches a configurable limit, BGP suppresses
> advertisement of the route even if the route is up. The accumulated
penalty
> is decremented by the half-life time. When the accumulated penalty is
less
> than the reuse limit, the route is advertised again (if it is still up).
>
>
> Tia
>
> >From: "Marco Rodrigues" <[EMAIL PROTECTED]>
> >Reply-To: "Marco Rodrigues" <[EMAIL PROTECTED]>
> >To: [EMAIL PROTECTED]
> >Subject: Link Flapping
> >Date: Sun, 18 Jun 2000 16:10:07 -0400
> >
> >Hey all, i've looked in the archives and can't really find an answer.
I'm
> >currently studying for my CCDA and I was doing a BOSON test question and
I
> >came accross the term, link flapping in coherence with Convergence. I've
> >never heard that term, i've looked at the Appendices/Glossary of my CCDA
> >book and in the archives of this mailing list and couldn't find an
answer.
> >Just curious does this word even exsist? If so how does it relate to
> >convergence.
> >
> >Thanks!
> >
> >
> >--
> >-------------------------------------
> >Marco Paulo Rodrigues
> >Junior Unix Systems Operator
> >Axxent Corporation
> >www: http://www.axxent.ca
> >Email: [EMAIL PROTECTED]
> >Work Phone : 1 + (416) 907-2880
> >TSE Stock Symbol : axi.b
> >-------------------------------------
> >
> >
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