> It's a little more basic than that. I'm no graph theory expert and reading > such stuff gives me a headache, but I do understand that abstraction > (summarization or aggregation) of routing information is only possible if the > identifiers that are used for numbering network elements (the > "addresses") are assigned in a manner that is isomporphic to > the network topology. TLi started writing a good paper which > described this in terms of sets and subsets; unfortunately, I > don't think it ever saw the light of day).
One of the first things I ever learned from Yakov (at the
first IETF I ever attended):
"Addressing can follow topology or topology can follow
addressing. Choose one."
He has since pointed out that this may not be strictly
true when considering VPN technologies.
Dave
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