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Internet routing table "completeness" monitoring?

On Wed, Oct 3, 2012 at 9:55 AM, Eric Tykwinski <eric-list at truenet.com> wrote:
> I agree, and just use the Threshold plugin so when it drops below or goes
> above a certain # to notify you.
> http://docs.cacti.net/plugin:thold

is a threshold helpful here? (well, it's helpful to a point at least)
what if your neighbour starts deaggragating (or sending you their
internal deaggragates) in place of 50k real routes? no alarm, no
'change' from a numbers perspective, but certainly a traffic shift and
reach-ability change :(

Isn't a speed-of-change threshold also interesting here?