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A user can communicate with other users in the same VLAN but the connection is really slow when trying to send large amounts of data. Many "late collisions" can be seen on one end of the Switch. What can be the source of the problem?
There is a Duplex Mismatch.
STP placed this port on blocked state.
The port on the other end is administratively "shut down".
The Cable or Interface card is faulty.
If the user connected to the switch can communicate with other users on the same VLAN then this switchport cannot be the STP blocked port. If there was a problem with the cable or interface (or if one end of the Switch is "shut down"), then no communication could happen at all. Duplex mismatch are difficult to detect because the link is working, but when sending large amounts of data the link usually crashes. For example if one end is configured as Half-duplex many "late collisions" should be seen, and if the other end is configured with Full duplex , "FCS errors" and "runt frames" can also drastically increase. For more information refer to: http://en.wikipedia.org/wiki/Duplex_mismatch
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