Sprint BGP filters in 207.x.x.x?


There are lots of reasons a provider might aggregate networks for their
customers. One is that many customers are not able to run routing protocols
that do aggregation (customers that are not running routing protocols and
use a static default is one example). In fact, in this case Sprint ought
be doing aggregation for such customers (and I am sure they are).

In any case, MCI's policy is not unique. Many providers do this.