Routing and Forwarding Information Base Definition

CEF creates Forwarding Information Base (FIB). CEF offers the following benefit:

• Better performance than fast-switching(faster) and uses less CPU to do the same task

Enabling ip cef 

Router#(config)ip cef

Verifying ip cef : 

Router#show ip cef

%CEF not running

Router# show ip cef
 Prefix              Next Hop             Interface
 0.0.0.0/0           192.168.4.5          FastEthernet0/0
 192.168.0.0/24      195.168.11.1         Serial0/0

RIB , FIB, LIB, and LFIB definitions

RIB (routing information base) -> control plane 

sh ip route

FIB (forwarding information base) - data plane

sh ip cef

LIB (label forwarding base) -> store all known labels in mpls -> control plane

sh mpls ldp bindings

LFIB (Label forwarding information base) -> table used to forward packets in mpls -> data plane

sh mpls forwarding-table 

RIB uses FIB to forward packet

LIB uses LFIB to forward labels in mpls

Data Plane and Control Plane

Data plane/ forwarding plane is where the traffic is forwarded. The traffic flows through the 
router and not to the router. 

To be able to forward traffic then we need control plane. 

In there we use protocols for examples STP, EIGRP, OSPF, telnet, SSH etc