Re: [rrg] Aggregatable EIDs
jnc@mercury.lcs.mit.edu (Noel Chiappa) Tue, 12 January 2010 21:33 UTC
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Date: Tue, 12 Jan 2010 16:33:03 -0500
From: jnc@mercury.lcs.mit.edu
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Subject: Re: [rrg] Aggregatable EIDs
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> From: Lixia Zhang <lixia@cs.ucla.edu> > This proposal was considered and debated at the time, but did not > fly ... mainly due to the reason that has been articulated in this > thread of exchanges: the model does not match the ISP economics. To expand on this a tiny bit, let me give it to you as Yakov concisely put it to me: In routing (i.e. path selection), for the overhead of routing to scale 'reasonably' in large networks, either the 'addressing' (i.e. the names used by path selection) has to follow the topology, or the topology has to follow the addressing; i.e. there has to be a certain level of congruence between the two. (And by 'topology' I mean actual network connectivity - we're mis-using the term 'topology', but it's probably too late to fix that now, although if someone has a better alternative term, I will cheerfully switch to using it... :-) Unfortunately for geo-addressing, for economic reasons, topology usually follows traffic patterns (i.e. you lay/light-up fiber to match traffic flows), and traffic patterns follow relationships in the real world (e.g. between customers and their suppliers/providers). So driving the topology from the addressing end is not possible. Instead, the only way that works is relationships -> traffic patterns -> topology -> addressing. Noel
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