William Herrin allegedly wrote on 10/26/2009 6:31 PM: > On Mon, Oct 26, 2009 at 10:36 AM, Scott Brim <[email protected]> wrote: >> - Loc/ID separation is not directly routing's problem. The root cause, >> and the pivot point for a solution, is identification functions that >> use topology-dependent information as input. These functions are >> primarily in endpoints but are also in network infrastructure. They >> should be fixed, to the extent they reasonably can. Where they can't, >> then routing, mobility, etc. must take up the slack. The RRG >> recommends to the IETF that it needs to decide where that line is -- >> what identification functions will they assume will be fixed and which >> not -- so that other Internet technologies, particularly routing, can >> have a clearer idea what they have to do. > > Hi Scott, > > As a group we looked for a definition of locator and identifier and > got a dozen of mutually incompatible answers. I suggest we avoid that > terminology in any recommendation lest it make the recommendation > clear as mud.
I thought the concepts came out very clear in the end. See our definitions on the wiki. How to implement identification functions, e.g. with stack names or what, wasn't resolved, but we know what the classes of functions are so RRG can model it. > Can your statement be rephrased as something similar to: > > "layer-4 and higher references to the communicating endpoints are > strongly bound to the packet elements used for layer-3 forwarding > decisions, such that practically speaking one can not change > independent of the other. The pivot point for a solution would be > weakening that binding until it's no stronger than the binding to the > packet's layer-2 elements." > > Which is still somewhat opaque because of the circumlocution, but at > least it's built on concepts that are precisely understood. Well, "opaque" is a pretty good word for that text :-). For me identification and function feel clear but I'll ponder this. In return, please ponder how you're going to deal with confusion about what layer 3 and layer 4 are. Thanks, and more tomorrow. Scott _______________________________________________ rrg mailing list [email protected] http://www.irtf.org/mailman/listinfo/rrg
