I First found in version
II The version(s) already found this problem
III Description of the problem
The STP are disabled globally, add two ports which are link down into the SmartLink group, and delete the ports whose state are StandBy from the SmartLink group, then make the last two added ports link up.
We will find that the STP states of the two ports are not correct (it should not be forwarding) and it causes broadcast storm.
Update to version S5100EI-CMW310-R2200P01