Wanted to find out if anyone has seen these issues, if yes please let me know how to fix this.
Detail about our environment:
we use 3Com Switches 3870 48 Port (Product number# 3CR17451-91). 3 of the switches are stacked together with specific 3com stack cable; other 2 switches are connected via fiber connection which runs to other office located down the hall from the server room. we have multiple VLANs set up on these switches. 1 VLAN we use for server, 2 VLANfor all corporate client computers, 3 VLAN is used for printers, and 4th VLAN is used for internet traffic (VPN users, and all devices that provide any outside connections. all VLAN can communicate with each other.
Here is a description of the problem that started to happen a while ago:
Over all we are very happy with the performance of these switches. Lately i have noticed that all of a sudden my compute would indicate that it lost physical connection to the switch and then in approximately less then 60 seconds it would regain the connection. at the same time all users on the network that are connected to these switches have the same issues. They drop the connection as if someone would unplug their network cable and in 60 seconds everything becomes normal. when i looked at the switches during this event, all indicating lights show that the switches are rebooting. Only they are not actually rebooting since if you do an actually reboot it takes about 5 - 10 minutes for these switches to fully come up. This happens only on the switches that are stacked together, the other 2 that are located in a the office down the hall do not drop the connection, but of course since they are connected to the stacked switches via fiber all users loose the connection to the network until the switches come back up. This is really a strange issue, i looked in to make sure that the switches are running on the latest firmware and software, i tried contacting 3Com support but unfortunately did not get any help. I suspect that one of the stacked switches is having hardware problems. 3com tech. support had me run diagnostics on every single port of the switch and no errors have been found.
Please let me know if you have seen any similar issues, and if you did please let me know how to possibly resolve this.
Thanks in an advance for all your help.