Multiprotocol Label Switching
MPLS, which has been called "ATM without cells", has many similarities, at the forwarding level, to ATM. The label edge routers (LER) at the edges of an MPLS cloud map between the end-to-end identifier, such as an IP address, and a link-local label. At each MPLS hop, there is a forwarding table that tells the label switched router (LSR) which outgoing interface is to receive the MPLS packet, and what label to use when sending the packet out that interface.
Read more about this topic: Forwarding Information Base, Applications At Data Link Layer
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