I think I found a way to perform loc/id split using 2 layer (ethernet), albeit I am not sure how practical it is. Namely, by redefining MAC address to be a MAN-wide topology-dependent locator and using a prefix-bunch addressing scheme (yes, it is possible). What surprised me most is the possibility of dumb-dumb-dumb Ethernet switching logic employing no routing/MAC tables, associative memory or longest prefix matches. This is not a proposal for RRG as (1) it does not need to be (2) it can't solve the 3rd layer scalability problems, just ease them a bit. It might be interesting from the standpoint of Metro Ethernet technologies or general curiousness. The paper is very compressed (2 pages), so don't hesitate to ask. http://oc-co.org/articles/MAC-loc.pdf
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