I'm in the boat with Paul, as my kneejerk reaction was "enable portfast". 
However, if you've done that, then you can start to analyse the problem from
ground up (or Layer 1 up =) .  Since you *can* ping this thing eventually, I
think we could safely rule out a physical wiring problem or the like.  So
next, I would console (or telnet) into the switch and watch the that
specific port (in the 1900 series it's under the Port Addressing menu).
Then, plug the PC in and keep watching the port addressing for that port and
see how long/when the switch learns the MAC for the PC.  If it learns the
MAC instantly (which it should), then I don't see where the switch is
causing the problem. As long as switch sees the MAC addr.  Also, assuming
your switch and the PC are in the same IP subnet, I would try pinging the PC
from the switch directly instead of from another PC.

Hope this helps some.... let me know how it goes...... interesting problem.

Mike W.


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