MPLS: Header and Label

The MPLS header is 4 bytes long, and located immediately before the IP header.  The label is a 20 bit field within the MPLS header.

MPLSheader.PNG

Label – identifies a portion of the label switched path

Experimental (EXP) – used for QoS marking, not actually used for experimental purposes

Bottom-of-Stack (S) – Flag, when set to a 1 means the IP headers are next

Time-To-Live (TTL) – Same meaning as IP header field

 

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