Unexpected BPDU received. Port has been Disabled

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Unexpected BPDU received. Port has been Disabled

One of our Cisco 3750G switch keeps showing this warning: Description: Gi4/0/43: Unexpected BPDU received. Port has been Disabled. Recommendation: Check Configuration of the switch, also make sure devices connected to the switch. Enable this port again.

However, there is no thing connect to the port Gi4/0/43 as shown the below. Why do you get this warning?

One or some ports were configured trunk with portfast as shown below. removing portfast and bpduguard
switchport trunk encapsulation dot1q
switchport mode trunk
spanning-tree portfast
spanning-tree bpduguard enable

More case can be found this page: Cisco Switch: Unexpected BPDU received. Port has been Disabled

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