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An increasing number of input errors in excess of one percent of total interface traffic can be seen on the output of "show interfaces serial []". What is not a cause of this behavior?
Bad router hardware.
Incorrect clocking configuration.
Incorrect cable or too long.
Noisy serial line.
Packet size exceeds the MTU.
If a packet size exceeds the size of the configured MTU, the packet will be fragmented, and no input errors will be counted on the interface. For more information refer to: http://en.wikipedia.org/wiki/Maximumtransmissionunit And for more information refer also to: http://penta2.ufrgs.br/trouble/trserline.htm
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