STP on a bridge

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http://serverfault.com – I have set up a bridge on an interface em1 and connected 4 vms to the bridge. I disabled stp on the bridge. There is no chance of looping as there is only one bridge in this setup, there occurs a BPDU error due to broadcast storming in my switch. Will a bridge forward packets on the source port also if STP is disabled or is there any other reason for this broadcast storm? (HowTos)