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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?

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What if two network interfaces are set up on one of your VMs and bridging is enabled? ---> loop! – EEAA Dec 12 '12 at 13:57
"em1" is this xen with a BSD dom0? Knowing what virtualization environment is involved really helps with the details since implementations differ wildly in their behaviour. – rackandboneman Dec 14 '12 at 2:22
My seup: I created lxc containers on a centos 6 host machine. em1 of host machine and eth0 of containers are connected to linux bridge – kalyan Dec 16 '12 at 12:10

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