The LIB is maintained by LDP and contains the locally allocated and received labels. It is control plane only and is not used to forward traffic. The LFIB is used for MPLS forwarding as such (tag to tag or tag to IP operation). It is created from the FIB and LIB.
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Label Information base, is a table contains Label bindings associated with Prefixes. a Label Switch router Performs Lookup On the LIB table to forward (IP to IP) or (IP 2 Label). Every Label Switch router has distribute label bindings to its neighbor LSR using different modes could be either:
1- Per Interface Label allocation: This is the case for LC-ATM Interfaces (Downstream On demand) Cell Mode. In this case, a Label Switch router distribute Label binding Only if it receive a request from the Downstream LSR.
2- Per Platform Label allocation: This is case for Frame-mode Mpls (Unsolicited Down strem) In this case, a label Switch router distribute Label binding to every Label Switch router.
All of the Above is part of the Control Plane.To view LIB table, issue the command (Sh Mpls Ldp Binding).
Label Forward Information Base (LFIB):-
This is Part of the Data Plane, a LSR performs Lookup at the LFIB to forward (Label 2 label) or (Label 2 IP). The LFIP table Contains:
a- Incoming Label.
b- Outgoing Label.
c- Exit Interface.
d- Nexthop address.
to View the LFIB table, issue the command (sh Mpls forwarding-table).
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