MPLS is a highly scalable, protocol agnostic, data-carrying mechanism. in an MPLS network, data packets are assigned labels. packet-forwarding decisions are made solely on the contents of this label, without the need to examine the packet itself. this allows one to create end-to-end circuits across any type of transport medium, using any protocol. the primary benefit is to eliminate dependence on a particular Data Link Layer technology, such as ATM, frame relay, SONET or Ethernet, and eliminate the need for multiple Layer 2 networks to satisfy different types of traffic. MPLS belongs to the family of packet-switched networks.
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