PortFast + BPDU Guard | STP Optional Features

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PortFast and BPDU Guard are STP optional features used to help speed up the convergence of access ports.

PortFast pretty much disables STP so it is important to ONLY use this feature on access ports. It lets a port go straight to the forwarding state instead of going through the listening and learning states.

BPDU Guard can disable ports that are connected to other switches. This can be used to ensure your Portfast interfaces do not accidentally get connected to another switch which could potentially cause a switching loop.

Enable Portfast
Per Interface: spanning-tree portfast
Globally: spanning-tree portfast default

Enable BPDU Guard
Per Interface: spanning-tree BPDU Guard enable
Globally: spanning-tree portfast bpdugaurd default

Show Commands
show spanning-tree summery
show spanning-tree interface fastethernet 0/1 portfast
show spanning-tree interface fastethernet 0/1 detail
show running-config
show interfaces status err-disable
show interface fastethernet 0/1





#ccna #cisco #networking