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Re: OSPF multi-level hierarchy: Necessary at all?
Tony Li <[email protected]> wrote: >> There's a better solution: decrease the number of nodes by replacing >> clusters with bigger boxes. This has an additional advantage of reducing >> number of hops (and, consequently, latency variance). >Certainly that helps, but as we move forward you still end up with lots of >boxes in the network simply because you're in many different geographic >locations. Well, actually it is not that bad. The biggest number of locations is probably found in AT&T phone network - 250 or so. Sprint is in few dozen. The existing IGPs are quite happy with that kind of complexity, so if you belong to the "one-router-per-POP" school of thought the IGP complexity is a non-issue. --vadim