we have a problem with 3com 48 port superstack 3 3250 switches randomly
resetting. Its happening all over the place and 3com are refusing to
acknowledge a problem. A good illustration is: in a cabinet we have
3x3250s and 1x superstack 3 3226
the main network comes in on a fibre connected to a gigabit port & an
adapter. the switches are chained using utp on the gb ports
if the cabinet is configured thus:
fibre > 3226 > 3250 > 3250 > 3250
the first (and only the first) 3250 randomly reboots
if the cabinet is configured:
fibre > 3250 > 3250 > 3250 > 3226
we have the same problem. the first 3250 randomly reboots. it doesnt
seem to matter which 3250 is which.
in other smaller cabinets with only one or two switches we've
temporarily fixed the problem by replacing the 3250 with a 24 port 3226
and having the inputs spread around. this seems to run ok.
we're in the process of getting hold of a filtered ups to try. The Firmware is 1.20.00.01
any ideas on whats going on or experienced anything like this
You shouldn't really cascade switches in that way, it makes them less efficient.
enable STP and have them set up so each switch is directly connected to the switch with the fibre module.
fibre > 3250
I suspect this isn't a fault with the switches - I have seen our 3250 and 3226's reset (but not reboot) when they there is a fault on another, seemingly unrelated switch - Removing an old 100Mb Hub that we'd forgotten about fixed our problem. Good plan with UPS, Ethereal and Nagios may also help diagnose.