The line-speed packet forwarding rate of 1 gigabit port is 1.488 1MPPS, and the line-speed packet forwarding rate of 100 Mbps port is 0. 1488 1MPPS, which is an international standard, but how did it come from? During transmission, a specific packet will be preceded by 64 preambles, that is, a 64-byte packet. Originally, there were only 5 12 bits, but in the transmission process, there would actually be 5 12+64+96( 12 byte frame gap) = 672 bits. That is to say, the length of a packet is actually 672-bit gigabit port line-speed packet forwarding rate =1000 Mbps/672 =1.488095 MPPs, which is approximately equal to 1.48 1 MPPs, 100 Mbps divided by.