My Cisco 3750 switch deactivated a port when I connected a hub because a loop back was detected.
sh interfaces fe 5/0/10 output is:
FastEthernet5/0/10 is down, line protocol is down (err-disabled)
I would like that anybody say me how I can to activate again this port.
Anybody knows how can be the causes of this fact?. The hub is a HP ProCurve.