Multiprotocol Label Switching - MPLS IP Forwarding: Data Plane - The MPLS Header and Label

3 important questions on Multiprotocol Label Switching - MPLS IP Forwarding: Data Plane - The MPLS Header and Label

What are the different MPLS header field and lengths?

-Label 20 bits
-Experimental (EXP) 3 bits
-Bottom-of-stack (S) 1 bits
-Time to live (TTL) 8 bits

What is the purpose of Experimental MPLS field?

Used for QOS Marking: field is no longer used for truly experimental purposes.

Which field within the MPLS header is used to mark the last label before the IP header?

S-bit

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