>Hey all.  I'm going to risk starting a flame war by asking the following:
>

A bit more precision. You have to consider more than one kind of 
performance.  One is route lookup in the fast forwarding path, and 
the other is changing the routing table (possibly in the same 
processor that does forwarding, in a small network).

With modern algorithms such as Cisco's patented trie or the Patricia 
trie, route lookup times do not increase appreciably with the number 
of routes.  Memory increases, but lookup time much less so.

The increases in load come from changes to the routing table and 
consequent changes to the FIB.




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