Did you know that RIP, the venerable routing protocol that is present in Cisco routers for the last 20 years, uses an internal database, not the IP routing table, to process RIP updates? This database contains no fancy information (like EIGRP topology table) that would allow RIP to converge faster, but there are still minor differences between the RIP database and the IP routing table.
Ivan Pepelnjak, CCIE#1354, is the chief technology advisor for NIL Data Communications. He has been designing and implementing large-scale data communications networks as well as teaching and writing books about advanced technologies since 1990. See his full profile, contact him or follow @ioshints on Twitter.