Is there a possibility to use any other two OSI model layers' middle positions? What is the basic concept of switching of packets with MPLS on layer 2.5 of OSI Reference model?
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Is that a practical problem you are asking about (then please add further details) or rather a hypothetical question?– Zac67 ♦Mar 15 at 8:28
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MPLS is a layer-2 protocol. However, no layer-1 carries MPLS directly, so it gets tacked on to various other layer-2 protocols. (hence "layer-2.5") Adding it after a layer-3 header would make no sense as the entire point was to eliminate the overhead of IP routing.
