LIB vs LFIB in MPLS

The Label Information Base, or LIB, contains all received labels from remote peers and is similar to the IP RIB. Not all labels received from LDP neighbors are used since there will be a best path selected and to be used for forwarding for each prefix. Forwarding decisions are based on the Label Forwarding Information Base, or LFIB, once the best path towards the next-hop LSR is determined. How this is determined is based on the close relationship between the LIB, the LFIB and the IP routing table (RIB).