4 questions on "Multiprotocol Label Switching - MPLS VPNs - MPLS VPN Data Plane"
LFIB & FIB
The Cisco Express Forwarding (CEF) Forwarding Information Base (FIB) contains forwarding information for incoming unlabeled packets. The Multiprotocol Label Switching (MPLS) Label Forwarding Information Base (LFIB) contains forwarding information for incoming labeled packets. Contained within the FIB is the label that must be inserted in front of the IP header so it can be passed onto the MPLS network.
The ultimate router recieves a packet that has only the VPN label in it.
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