A BPDU guard is configured on an interface that has PortFast enabled. Which state does the interface enter when it receives a BPDU?

Last Updated: Jul 20, 2020
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A BPDU guard is configured on an interface that has PortFast enabled. Which state does the interface enter when it receives a BPDU?

  • Blocking
  • Shutdown
  • Listening
  • Errdisable

Explanation: PortFast BPDU guard prevents loops by moving a nontrunking port into an errdisable state when a BPDU is received on that port.In a valid configuration, PortFast-configured interfaces do not receive BPDUs (because PortFast should only be configured on interfaces which are connected to hosts). If a PortFast-configured interface receives a BPDU, an invalid configuration exists. BPDU guard provides a secure response to invalid configurations because the administrator must manually put the interface back in service.Reference: http://www.cisco.com/c/en/us/td/docs/switches/lan/catalyst4000/8-2glx/configuration/guide/stp_enha.html

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