On Wed, 24 January 2001, "David P. Maynard" wrote:
Several times over the past few years, the NANOG list has discussed the topic of if or how non-transit peer BGP announcements should be filtered. I searched through the archives, but couldn't find where anyone had published a summary of best practices for filtering announcements from peers that aren't one of the "top N" (for some debatable value of N) NSPs.
I don't know why you wouldn't also filter the Top N providers, since most of the huge problems have resulted in poor filtering between large providers. A small provider can't really have much of an impact on the net unless their bogus announcements are propagated. Its the propagation of bad information which turns it into a worldwide problem. As to your question. Try searching for discussion about "access-list 112" It will be a bit heated, but you'll find a few usefull tidbits in there.