Guys can someone please help me out as i cant get my head around MPLS terminologies......they say that FIB is derived from CEF and it sth etable which is mapping of network to lables (as in CEF its network to MAC) now LIB is mapping of lable to lable and say sthat it developed whne ldp is configured and LFIB is again network to lable maping.....so whats the difference between FIB and LFIB??? does LSR router contains all th etables (all three of it) guys plz help me out as i m vvv confused??? regards
LIB is control plane - built by LDP, RSVP, etc based on entries in the RIB (routing information base - also control plane, built by OSPF, connected, static, etc). Maps all the entries in the RIB to an appropriate label
LFIB is forwarding plane. These are the entries that are used for forwarding lookup. Derived from the FIB (forwarding information base, which is derived from RIB).
FIB, along with the adjacency table is what comprises CEF.
unlabeled IP packets are identified by the protocol ID\Ethertype value in the layer 2 header, which would be 0x0800 and would be processed by the FIB
labeled packets are identified by the protocol ID\Ethertype value in the layer 2 header, which would be 0x8847 for mpls unicast and 0x8848 for mpls multicast and would be processed by the LFIB
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