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An operational PortFast receives a BPDU and automatically disables the port, what can be causing the issue?
The port is configured as a trunk port.
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 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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