I had a broadcast storm that killed some switches on my lan. The problem was a loop.
The setup was : smc 5ports switch with a loop----3 com dual-speed hub ----catalyst 2950.
The swithport setup was :
switchport access vlan xxx
switchport mode access
The global commands are:
spanning-tree mode pvst
spanning-tree loopguard default
spanning-tree portfast bpduguard default
no spanning-tree optimize bpdu transmission
spanning-tree extend system-id
It's not right to use access port with a hub, but the spanning-tree portfast bpduguard default handles if a loop occurs and a non-cisco hub or switch send BPDU packets.
The problem is that the 2950 didn't drop the port err-disabled and the storm occurs, the CPU of the switches 99% usage.
Did you have issues like that, and how can I prevent this?