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Implementing and Operating Cisco Enterprise Network Core Technologies (ENCOR) · Cisco
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D, the RIB is the general routing table could be with different routes to the destination but the FIB is the final decision however can have multiple entries when there is two paths with equal metric in the case we have ECMP (Equal-Cost Multi-Path) .
RIB: A database of all possible routes that a router has learned from various routing protocols. FIB: A streamlined table derived from the RIB that contains only the best routes to each destination.
RIB contains multiple routes to each destination, including all possible paths while the FIB contains the best routes selected from the RIB.