Hope anyone can verify if my understanding is correct:
when portfast is enabled on a switch port, and someone connects a hub/switch to this port.
With bpdu guard enabled, the port will be disabled. if errdisable-timeout interval is configured and the port timeout interval is up, it will enable the port. However, if the hub/switch is still connected to the switch port, the switch port will be errdisabled again until the switch port does not receive any bpdu?