Frustrating Network or Switch issue
Posted on 2011-04-26
Weird issue on my 3COM 3870 Gigabit switch...
Symptom: If I move a PC and connect it to another port on the switch, I get "limited or no connectivity" on the network properties and get no network access until I move the patch cable to another vacant port on the switch. Then, the PC will DHCP an address and connect fine. The port that is vacated stays "dead" until I reboot the switch. Typically, I do not move PCs a lot, however, users with laptops/docking stations have this issue every morning when they redock. The band aid fix is to move them to another port on the switch, but there are only so many open usable ports that I have until I am forced to reboot the switch.
I am clueless as to how to troubleshoot this. I thought perhaps the switch was keeping the ARP info from the previous port alive this blocking the new, but the MAC address is not even showing in the switch's ARP table. Any help or direction on where to take this would be most appreciated.