I have at least one book and one internet article that say there is no MTU explicitly defined in 802.3ab so therefore jumbo frames are not "standard." But I guess that also means that the 1500 byte frame is not "standard" either?
Is the MTU explicitly identified in the standard?
IEEE 802.3ab was an amendment that specified the 1000BASE-T physical layer; it was not related to any changes in frame length. The maximum untagged frame length of 1518 bytes is specified in IEEE 802.3 Subclause
4.4.Note: "MTU" refers to the maximum length of an IP datagram (i.e., a Network layer entity, as opposed to the Ethernet Data Link).
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