The BPDU received from the peer is inferior with designated role and state as learning or forwarding. Since this condition could be caused by a unidirectional link failure, the interface is assigned to blocking sate and marked as disputed.
The disputed BPDU threshold is an integer variable that represents the number of disputed.
BPDUs must be received on a given port/STP domain until a disputed BPDU trap is sent. For example, if the threshold is 10, then a trap is issued when 10, 20, 30, etc. disputed BPDUs have been received.
If the threshold is configured as "none," a trap is not sent. The trap indicates port, STP domain and total Disputed BPDU count.
The default is none.
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