>> no. non-transitiveness through local naming, the reason this has not
>> allowed serious damage in current practice.
>
> a receiving operator could limit scope, if they chose. something like
>
> route-map foo p 10
> match community blackhole
> match as-path ^([0-9]+_){1,2}$
> set ip next-hop null0
> route-map foo d 20
> match community blackhole
> route-map foo ...
yes, they *could* if they so chose.
the problem is that most won't. as we know, unintentional (or more
correctly, thoughtless) leakage of all sorts of garbage is rampant
today. weaponizing (you gotta love american verbing of nouns)
well-known communities that will assuredly be leaked; what could
possibly go wrong?
randy