Re: using IRR tools for BGP route filtering

AS Path filtering would be much smaller than prefix based filtering. Perhaps small enough to work on existing routers. These filters could also be built using registry data, from the ASes that make up providers' as-macros. Not a silver bullet, but probably significantly better than doing nothing.

Though it's certainly better than nothing, it does little more than ensure AS_PATH sequence and integrity .. it provides no protection against invalid announcements. -danny