Multiprotocol Label Switching (MPLS) functions by appending a label to any type of packet. The packet is then forwarded through the network infrastructure based on this label value, instead of any Layer 3 information. The labeling of the packet provides very efficient forwarding and allows MPLS to work with a wide range of underlying technologies. By simply adding a label in the packet header, MPLS can be used in many Physical and Data Link Layer WAN implementations.
The MPLS label is positioned between the Layer 2 header and the Layer 3 header. By using MPLS, overhead is added only when . . .
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