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单项选择题

After configuring FabricPath, the following appears in the syslog: 
%STP-2-L2GW_BACKBONE_BLOCK: L2 Gateway Backbone port inconsistency blocking port port-channel100 on VLAN0010. 
What is the cause of this message? ()

   

A. STP must be disabled; message indicates that STP is enabled.
B. STP is misconfigured; root guard must be disabled.
C. An inferior BPDU is received on a Cisco FabricPath edge port.
D. A superior BPDU is received on a Cisco FabricPath edge port.

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