7007 lessons
Do good peers filter their customers? Yes. 90% of one provider's ACLs are by AS
Other things would have prevented it as well, like setting a limit on number of routes from a customer
The one provider will probably go toward route-based filters, but there are business issues
Vince says the answer to the question is “Yes.”
A large provider will be filtering by route based on the IRR, and hence will not be routing to prefixes which are not registered. They are sending email to the origin AS of the routes.