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MTU configure too small cause two PC connect to ONT can't ftp to each other

Publication Date:  2012-07-25 Views:  51 Downloads:  0
Issue Description
on MA5680T I configured L3 VPN service for two ONT, two PC connect to ONT HG810 can ping each other. One PC became a FTP server, other was a FTP client but two PC could not executed FTP session.
Alarm Information
Null
Handling Process
I changed MTU value on ethernet switch port bigger than 1507, for example 1550 KB, after that two PC could run FTP normally.
Root Cause
Run Ethereal software to capture packet I knew that the FTP session was interrupted due to packet length was exceeded MTU value. the length of packet file after tag 2 VLANs is 1507 KB but MTU value on Ethernet switch port is 1500, by this reason the packet was dropped so two PC could not run FTP servive.
Suggestions
Null

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