Each reserved label has its own specific function such as Label 3 is the implicit NULL label whereas Label 14 is OAM alert label, and so on and so forth. They cannot be used by an LSR for normal forwarding. Label numbers ranging from 0 to 15 are reserved labels and can only be used for special purposes. Label: It is a 32 bit field that is locally significant and is used to represent an FEC of a packet. This behaviour is known as AToM i.e Any Transport over MPLS. Highlight: MPLS is called Multiprotocol because it can carry anything over an MPLS path irrespective of the underlying protocol: Ethernet, ATM, PPP, SONET etc. MPLS is also called Layer 2.5 as it resides between Layer 2 and Layer 3 of the OSI layer model. MPLS directs data from one network node to the next based on short path labels rather than long network addresses, avoiding complex look-ups in a routing table. MPLS is the most widely used technology in Internet Service Providers and Telecom Networks all over the world. MPLS is an acronym for Multiprotocol Label Switching which is a type of data-carrying technique for high-performance telecommunications networks.
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