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Generic Routing Encapsulation (GRE) tunnel has an overhead of 24 bytes. How much overhead does an MPLS LSP tunnel have?

April 26, 2017bytes encapsulation generic GRE LSP MPLS overhead routing tunnel

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Generic Routing Encapsulation (GRE) tunnel has an overhead of 24 bytes. How much overhead does an MPLS LSP tunnel have?

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A. An MPLS LSP tunnel has one label (four bytes) or two labels (for example, when using Link Protection Fast reroute) of overhead. Unlike GRE tunnel, MPLS does not change the IP header. Instead, the label stack is imposed on to the packet that takes the tunnel path.