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The System MTU is the interface MTU for the 10/100 ports.
# system mtu 1600
The Jumbo MTU is the interface MTU for the GE ports.
# system mtu jumbo 9000
The alternate MTU can be an interface MTU for any 10/100 or GE port. 

IP Packet [1500 Bytes] = IP Header [20 Bytes] + TCP [20 Bytes] + Payload [1460 Bytes]
Ethernet Frame Header [18 Bytes] = SRC MAC [6 Bytes] + DST MAC [6 Bytes] + Type [2 Bytes] + CRC [4 Bytes]
Ethernet Header [1518 Bytes] = IP Packet [1500 Bytes] + Ethernet Frame Header [18 Bytes]

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