MTU commands flavors

Hello all, i would like your help in understanding the differenet types of MTUs in IOS CLI. I have searched a lot but found nowhere a straight answer.

#mtu

This is the mtu for the physical interface,correct? Does this mean that all L2 overhead is excluded? E.g for non-tagged ethernet we have 14 bytes for header + 24 bytes for others = 38 bytes/packet total overhead. So is this value maximum 1500, having as a result  1538 bytes totally transmitted?

#ip mtu

Does this include IP header (20 bytes)?

#mpls mtu

I dont know what this includes :)

Any help is very welcome!

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