Re: Is the export policy selective under valley-free?

I think that yes, the valley-free property is a necessary but not sufficient criteria for generating the set of in-reality-valid paths on the Internet.

i assure you that the actual topology is not valley free. e.g. there are many backup or political hack transit paths [0] between otherwise peers and there are also backup customer/provider reversals. often academic researchers assume the valley free condition to simplify their models. often this creates serious amusing in their results. randy, on holiday and should not be reading nanog, let alone responding