On Thu, 19 Apr 2001, Priscilla Oppenheimer wrote:
> It doesn't answer the question. It says there's a penalty for each flap.
Is
> there a penalty for
>
> 1. each time a route goes down
> or
> 2. each time a route goes down and back up
>
> The answer is probably number 2, as the orignal poster thought also, since
> just going down isn't really "flapping."
Well, maybe I'm missing something, but I don't see how a route could go
down more than once without going up meanwhile, or up more than once
without going down meanwhile. So 1 and 2 are pretty much the same thing,
except perhaps for an extra up or down at either end. OTOH, it could be
that some BGP implementations send several WITHDRAWS in a row, or that a
single route going down may result in a given router getting several
withdraws (eg, redundant route reflectors, or multiple peers advertizing
the same prefix). Does someone know whether 1- BGP protocol definition
allows sending several WITHDRAWS to the same peer for a single up-down
transition and 2- routers apply the flap penalty repeatedly when they get a
WITHDRAW for a prefix already marked down?
--
"Someone approached me and asked me to teach a javascript course. I was
about to decline, saying that my complete ignorance of the subject made
me unsuitable, then I thought again, that maybe it doesn't, as driving
people away from it is a desirable outcome." --Me
Message Posted at:
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