A . 拓扑改变通知BPDU(Topology Change Notification BPDU)。B . 拓扑改变通知配置BPDU(Topology Change Notification Configuration BPDU)。C . 拓扑改变确认配置BPDU(Topology Change Acknowledge Configuration BPDU)。D . 拓扑改变配置BPDU(Topology Change Configuration BPDU)。
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