MultiProtocol Label Switching (MPLS) refers to a data-carrying mechanism that imitates some of the properties of a circuit switched network over a packed switched network. MPLS operates at an OSI model layer that is considered to lie between traditional definitions of Layer 2 (data link layer) and Layer 3 (network layer).

This is the reason for referring it as Layer 2.5 protocol. It is intended to offer a unified data - carrying service for both circuit -based clients and packet switching clients that provide a datagram service model. MPLS is used to carry various kinds of traffic including IP packets, native ATM, SONET and Ethernet frames.

A whole lot of technologies have been used to deploy with essentially identical goals. MPLS is replacing various technologies because it is in tune with present and future technology needs.MPLS was called "Tag Switching" when it was proposed by Cisco. Later when it was handed over to the IETF for open standardization, it is called as Label Switching.

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