I have a Cisco network enviornment. My core switch consists of 4 3750 switches, setup in a stack configuration, tied together with stack cables on the back. I also have a Cisco Wireless Controller 4402. The controller is connected to the switch stack via a fiber GBIC and a multimode fiber patch cord, about 1 meter long. For some reason the controller will be accessable on the network for a while and then drop off for a while. This cycle is repeated over and over again, no matter how I configure the ports on either device, the controller or the switch.
It may not be any help, but I also have this trouble with my APC UPS NIC cards.
How do I figure out what is wrong here?