Relationship Between The Routing Table and Forwarding Information Base
See forwarding plane for more detail, but each implementation has its own means of updating the forwarding information base with new routes installed in the routing table. If the FIB is in one-to-one correspondence with the RIB, the new route is installed in the FIB after it is in the RIB. If the FIB is smaller than the RIB, and the FIB uses a hash table or other data structure that does not easily update, the existing FIB might be invalidated and replaced with a new one computed from the updated RIB.
Read more about this topic: Routing Control Plane
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