Hi Tony and Noel, Tony, thanks for your responses to my message.
If you want to stick with a DFZ definition which includes or is restricted to ASes, then Noel's explanation, my previous explanation, my new one below are inappropriate. However, in the RRG we are primarily or solely concerned with routers - specifically "DFZ routers" which are the devices affected by the scaling problem we need to solve. So I think it would be better to have a definition of "DFZ" as it relates to RRG work. If you think a router-specific definition is in order, here is a shorter suggestion prompted by Noel's suggestion: > I agree we could use a better DFZ definition, but I find your proposed > definition to be too obscure and technical. I would prefer something in > simpler English, like "the set of Internet routers which contain full routing > tables, i.e. contain entries for all available destinations in the Internet". > One could also add something about how "the DFZ does not contain those > routers with a default route, potentially augmented with a limited subset of > the full routing table", or something. DFZ - Default-Free Zone: The set of routers which need routes for all, or almost all, the prefixes advertised in the interdomain routing system. Routers with a single "upstream" link to all ASes other than their own can use a default route to cover most of these prefixes. This definition explains the function of the default route, and by implication the reason for the rather curious term "Default-Free Zone". I think this definition is more precise, by using "need", since the definition suggested by Noel would also include routers with a single upstream link, which could use a default route, but were instead configured to have the full routing table. If a Route Reflector with a single "upstream" link is to be considered as a DFZ router, please add "Many" at the start of the second sentence to allow for these without adding another two sentences of fine-print. Perhaps you can delete ", or almost all,". - Robin _______________________________________________ rrg mailing list [email protected] http://www.irtf.org/mailman/listinfo/rrg
