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How do I enable PortFast on a Cisco switch?
First, you need to select an interface for which you want to enable or configure PortFast, and then execute the spanning-tree portfast command to enable this feature. As shown in the preceding figure, the PortFast feature will only have effect when the interface is in a non-trunking mode.
Why would you enable PortFast?
Enabling the PortFast feature causes a switch or a trunk port to enter the STP forwarding-state immediately or upon a linkup event, thus bypassing the listening and learning states. The PortFast feature is enabled at a port level, and this port can either be a physical or a logical port.
How do I check my PortFast status?
To view the configured Spanning Tree PortFast enabled ports, run the “show running-config” IOS command as shown below. We can see that PortFast is enabled on access ports fa0/1 to fa0/24. To display a detailed summary of interface information, run “show spanning-tree detail” command as shown below.
How do I enable PortFast and BPDU guards?
Navigate to Configuration>Branch>Smart Config and select the Networking tab. In the Ports table, click the port number for which you want to enable PortFast and BPDU Guard.
What is Switchport Nonegotiate command?
switchport nonegotiate: Prevents the interface from generating DTP frames. You can use this command only when the interface switchport mode is access or trunk. You must manually configure the neighboring interface as a trunk interface to establish a trunk link.
Is BPDU guard enabled by default?
spanning-tree portfast bpduguard default Globally enable BPDU guard. (By default, BPDU guard is disabled.) Note Globally enabling BPDU guard enables it only on STP ports; the command has no effect on ports that are not running STP.
What is Spanning Tree Protocol (STP) portfast?
What is Spanning Tree Protocol (STP) PortFast. Spanning Tree Protocol (STP) convergence (Layer 2 convergence) happens when bridges and switches have transitioned to either the forwarding or blocking state.
How do you shutdown a Cisco switch?
Pull out the power plug. Cisco’s aren’t like Juniper’s – there’s no “shutdown” command. if the pwoer is on, the switch will be on. You can *disable* it by putting every interface into “shutdown” state if you wish.
What is a Cisco SPAN port?
SPAN is an acronym for Switched Port Analyzer. SPAN is Cisco’s name for Port Mirroring. Other companies have their own names for it but the purpose is the same. Port Mirroring copies frames to a port for a system to read.