On Mar 9, 2012, at 7:08 PM, George Bonser wrote: >> Owen said: >> >> I'm not a big fan, either, but, I think that the concept of "be >> conservative in what you announce and liberal in what you accept" has >> to apply in this case. Since it is a common (quasi-)legitimate >> practice, arbitrarily filtering it is ill-advised IMHO. > > While I agree in principle, 16 bits of disaggregation has the potential for a > lot of mayhem and 32 bits (accepting /64 from PA) would be catastrophic. > This would seem to be a case where upstream providers can assist the end user > in obtaining their own PI space if they wish to multihome. It would be in > the provider's interest as it would reduce the number of potential complaints > from customers concerning multihoming problems. > > I filter /32 from PA space and am currently filtering one route but since the > aggregate it is from has the same next hop and since I don't see the route > from anyone else, I'm not worried about it.
I haven't heard anyone advocate accepting less than a /48. I think /48 is a reasonable "You must be this tall to ride" barrier. Beyond that, YMMV. Owen
