There had been instances where in my live network (where STP is enabled)if someone plugs in a hub my network goes down.Now i want to replicate same scene in the Lab and i unable to create loop as STP automatically blocks that port( which it should do idealy on a live LAN) If anyone could help me , i have tried everything from
1) using cross cable to connect switches
2) connecting hub to both switches
3) and connecting a cross cable on hub
but still no loop.If anyone could help me on this.