On Thursday 13 March 2008, Jesper Skriver wrote: > I'd say exactly the opposite, it's trivial to build a > core network with redundancy, so it doesn't depend on any > single box or link. But on the edge a given customer is > typically connected to one box, when that box goes down, > the customer looses connectivity, so on edge boxes you > need redundant boxes much more than in the core.
This is why I mentioned the exception being in a multi-homed situation. But given a case where most customers will single-home to an ISP, it would seem harder to justify having several more boxes than necessary. However, if a customer is dual-homed to you, sure, that justifies itself no problem. A network may have multiple edge routers and provision customers onto them in a round-robin fashion to mitigate impact in case one of them fails, but that single-homed customer still loses his connection to the ISP if his edge router was the one that died. Mark.
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