What is fib and rib

The same process has also happened on the next router and the next one, until the packet reaches its destination. What is a RIB? Where does the routing table fit in? This difference between the two diagrams is rather clear. However, one could see how this can be over generalized in terms of Cisco IOS. For instance, we really only get to look at the data structures for each routing protocol in Cisco IOS.

I would argue in some cases that looking at the protocol data structures would give you a good idea of what you can expect to see in the routing table RIB. However, the routing table is not necessarily a full representation of all the prefixes a routing protocol has available to it since some might not win the admin distance battle.

Learning to read the protocol data structures is the best way to get a full representation of all of the routes a IP routing protocol has available to it. That includes layer 3 and layer 2 information. For instance, we can look at a CEF entry and see both…. The adjacency for that interface shows the MAC address of the destination. The next 12 characters are the destination of the source the local router. The Cisco Learning Network.

View This Post. Edited by Admin February 16, at AM. Erick gave you some good answers. All Answers. Hi Ahmad, That's a lot of questions. EX: show ip cef. Sign up using Facebook. Sign up using Email and Password.

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