Understood. But... networks filtering out the /24 announcement will
always prefer the aggregate learned from the owner/issuer of the space.
They'll be completely unaware that another route exists to the (/24)
network. If the customers link to the provider that assigned the space
goes down, those filtering /24's will still send the traffic to the
'owner' of the space (right?).
What is the issuer of the /24 is filtering incoming /24 advertisements
(Verio)? Will they learn the route to the other ISP or blackhole
traffic destined for their own customer?
I keep hoping that I am missing something here. If not, I sure hope
more folks don't adopt Verio's filtering techniques. (I know that a
VERY low AS # issues /24's out of a /8)