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Refer to the exhibit. Switch SW1 is connected into a LAN running STP. Port 1/1 is configured as a trunk port and connected to the LAN to participate in the STP network. SW1 converges into the STP network, but don't go through Listening and Learning states. Looking at the output, what can be the cause of the issue?
Vlan 1 is in blocking state.
Port Guard is not enabled on the port 1/1.
The priority must be set to 32768.
Portfast feature is enabled.
The output of the command displays the information of port 1/1 in switch SW1, where the feature Fast-Start can be seen to be enabled. If port-fast is enabled then BPDUs will be ignored on the port. The port will not spend the usual 50 second to come up while STP is converging. This is a way to disable STP on a port. 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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