IPv4 DHCP has issues with the 30 second delay following a physical device connection, PortFast is designed to address this issue
A End Device Switch port using PortFast transitions from the Blocking State to The Forwarding State immediately and avoids the 30 second delay
PortFast should only be used on End Device Access Ports otherwise you will create the opportunity for a loop
A PortFast-enabled switch port should never receive BPDUs because that would indicate that switch is connected to the port
Cisco switches support a feature called BPDU guard. When enabled, it immediately puts the switch port in an errdisabled (error-disabled) state upon receipt of any BPDU
The administrator must manually put the interface back into service