> On Tue, Apr 18, 2006 at 11:42:27AM -0400, Keith Moore wrote: > > > It smells remarkably like pathalias to me ;-) > > > > except that I'm not proposing that border routers do source routing, > > just that they map from PI identifiers to PA locators and prepend a > > header that causes the payload to be routed to the locator. > > And that sounds exactly like pathalias and what the Usenet/SMTP smart > routers did, yes? not in my recollection. It's been awhile, but I recall pathalias being used to do source routing - given a hostname, to specify a complete path to that host. (I also recall it sometimes being used to do rerouting - discarding the current source route and replacing it with one thought to be better. It's also my recollection that the latter tended to cause routing loops and dropped messages.) I don't recall pathalias being used to replace a global location-independent identifer with an aggregatable global locator. UUCP didn't have any such beast. > Hopefully though they wouldn't require as much CPU > power to calculate as pathalias database required pathalias was trying to add automatic routing to uucp. we're already doing routing in the internet, and I don't see how what's being discussed here will increase the complexity of those computations over what they already are. as far as I can tell, we're talking about ways to make routing computations _more_ efficient. adding a layer of indirection that hides locators from end networks should allow locators to be strictly PA and even to be renumbered from time to time without impacting users. Keith _______________________________________________ Ietf@xxxxxxxx https://www1.ietf.org/mailman/listinfo/ietf