MPLS

Multiprotocol Label Switching (MPLS) is a mechanism in high-performance telecommunications networks that directs data from one network node to the next based on short path labels rather than long network addresses, avoiding complex lookups in a routing table. The labels identify virtual links (paths) between distant nodes rather than endpoints. MPLS can encapsulate packets of variousnetwork protocols. MPLS supports a range of access technologies, including T1/E1, ATM, Frame Relay, and DSL.


https://en.wikipedia.org/wiki/Multiprotocol_Label_Switching