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What is a label? What is the structure of the label?

April 26, 2017Label structure

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What is a label? What is the structure of the label?

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A. A label is a short, four-byte, fixed-length, locally-significant identifier which is used to identify a Forwarding Equivalence Class (FEC). The label which is put on a particular packet represents the FEC to which that packet is assigned. • Label—Label Value (Unstructured), 20 bits • Exp—Experimental Use, 3 bits; currently used as a Class of Service (CoS) field.

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A. A label is a short, four-byte, fixed-length, locally-significant identifier which is used to identify a Forwarding Equivalence Class (FEC). The label which is put on a particular packet represents the FEC to which that packet is assigned. mpls-label.jpg • Label—Label Value (Unstructured), 20 bits • Exp—Experimental Use, 3 bits; currently used as a Class of Service (CoS) field.