Please refer to:
Http://www.pconline.com.cn/pcedu/soft/lan/jywgl/0408/428968.html
Http://www.pconline.com.cn/pcedu/soft/lan/jywgl/0404/353559.html
This factor is caused by local area network intermittent cramps, please pay attention to the following points when using small HUB:
First, don't connect between the two hubs that have been connected to the switch!
Second, do not connect two ports of the same HUB or switch on the network cable.
Third, do not connect to the parent switch between cascaded HUBs.
......
In short, think twice before picking up the cable, will I do this will cause a loop?
