在网络运行中，发现设备 CPU 长时间占用过高，经检查发现下图中的 "Number of topology changes" 值频繁变化，可初步判断该故障由（  ）导致，可能的原因是（  ）。<br /><table border="1" cellpadding="0" cellspacing="0"><tbody><tr><td style="width:664px;"><Switch>display stp topology-change<br />                                                  CIST topology change information<br />        Number of topology changes                     :35<br />        Time since last topology change                 :0 days 1h:7m:30s<br />Topology change initiator(notified)             :GigabitEthernet2/0/6<br />Topology change  last received  from          :101b-5498-d3e0<br />Number of generated topologychange traps:        38<br />Number of suppressed topologychange traps:        8</td></tr></tbody></table><br type="_moz" />

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在网络运行中，发现设备 CPU 长时间占用过高，经检查发现下图中的 "Number of topology changes" 值频繁变化，可初步判断该故障由（）导致，可能的原因是（）。

<Switch>display stp topology-change
                                                  CIST topology change information
        Number of topology changes                     :35
        Time since last topology change                 :0 days 1h:7m:30s
Topology change initiator(notified)             :GigabitEthernet2/0/6
Topology change last received from          :101b-5498-d3e0
Number of generated topologychange traps:        38
Number of suppressed topologychange traps:        8

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