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An operational PortFast receives a BPDU and automatically disables the port, what can be causing the issue?
The switch is filtering the BPDUs with BPDU filter function.
The port is configured with BPDU Guard and instead of a Server or a host-computer, somebody has inadvertently plugged in a network cable from another switch running STP
The port is configured as a trunk port.
The switch is globally configured with Root Guard feature.
The feature PortFast can be enabled on any port on the switch however; it is aimed only for ports connected to end-user devices. A PortFast will transition to STP forwarding state as soon as the interface comes up, bypassing listening and learning states. If the port is accidentally plugged into another switch "through a trunk link", a loop can be created. Port Fast should be enabled with BPDU Guard so that when the port receives a BPDU, the port will be shut down to prevent a loop. For more information refer to: http://www.cisco.com/c/en/us/td/docs/switches/lan/catalyst4000/8-2glx/configuration/guide/stp_enha.html
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