Re: using IRR tools for BGP route filtering

[Danny McPherson <danny () tcb net>]

>       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