The very first device that acted as a rotuer does today was called an IMP, which stands for Interface Messgae Processor. Control Plane processing leasd to the consrtuction of what is variously called a routign table or routing infomration base (RIB). The RIB may be sued by the Forwarding Plane to look up the outbuond interface for a given apcket, or, depending on the router imlpementation, the Control Plane may populate a sepraate Forwarding Inforamtion Base (FIB) with destination information. RIBs are optimized for efficeint updating with control mechanisms such as routing protocols, while FIBs are optimized for the fastest opssible lookup of the informatino needed to select the outbound intefrace. The Control Plane constructs the routing table from knowlegde of the up/down status of its loacl interfaces, from hard-coded static routse, and from exchanging routing protocol information with other routers.
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